Digital battery

Recently, the vanadium KD186 NF343 battery is subject to heated debate, supporters believe that the vanadium battery has a green, long life and other devices, with the rapid development of technology that will make a human being without precedent is a importance and scope of new energy industrial revolution. Opponents argue that only research institutions, as well as the vanadium battery are very beautiful blown foam, the sole purpose of financing needs. Finance Street EP after study has revealed that although the area of the vanadium battery is there are many problems, but it has the potential to undermine the process of past human use of energy, it is good to look forward.

Development of vanadium battery

Vanadium redox batteries (VRB, VanadiumRedoxFlowBattery) is the largest and most technologically advanced, closer to the industrialization of fuel cells, high performance reversible, with a great power, high capacity, high efficiency, low cost, a long life and a series of unique green benefits of wind energy, photovoltaic energy, energy peaks, distributed power generation, electrical storage military vehicles of municipal services, base station communication , power supplies UPS has a very wide field of good prospects in Japan, Canada, the United States, Australia, Western Europe etc. countries and regions have begun to replace the capacity of small, short life, pollution, advance considerable acid batteries. Inspiron 1318 battery Inspiron 1420 battery

Compared to other food chemicals, vanadium battery has obvious advantages, the main advantages are:

1. Big Power: increasing the number of single cells and the area of the electrode, you can increase the power of the vanadium battery, the commercial demonstration of American power in the vanadium battery is running has reached six megawatts.

2. High capacity: an increase in the volume of electrolyte, you can arbitrarily increase the power of the vanadium battery until gigawatt hours or more, increasing the concentration of electrolyte, you can multiply the power of vanadium batteries.

3. The efficiency is high: When the vanadium battery electrode high catalytic activity, and positive and negative electrode active material were stored in the storage tank positive and negative electrolyte, preventing the material of positive electrode and negative Active use of self-discharge battery vanadium and discharge energy conversion efficiency up to 75% or more, much more that 45% of battery lead acid. hp OmniBook XE3 battery  hp Pavilion dv8000 battery

4. Long life: When the vanadium battery positive and negative active material to exist only in the positive and negative electrolyte, charge and discharge the battery when no other phase-change policy, can not damage the battery deep discharge, long battery life. Canada Now VRBPowerSystems longest commercial demonstration module vanadium battery has worked more than 9 years, the charge-discharge cycle life of more than 18,000 times, much higher than the lead acid type fixed battery 1000 times .

5. Speed of response: the heap is full of electrolyte battery of vanadium could be launched at a moment in the process of filling and operation requires the execution of only 0.02 seconds to turn the state, response time 1 ms.

6. Perhaps snapshot: the electrolyte can be achieved by replacing the battery Vanadium instantaneous load.

7. High security: vanadium battery, without the potential risk of explosion or fire, although the mixture of positive and negative electrolytes is also non-hazardous, but the temperature of the electrolyte was slightly increased.

8. The cost is low: In addition to ion-exchange membrane, components of the vanadium battery, the cost for most materials at low cost carbon, engineering plastics, materials, sources of wealth, easy retrieval, not of precious metal catalysts as electrodes, and low.

9. Vanadium battery location large degree of freedom can be fully automated transaction closed, no pollution, easy maintenance, operating costs low. Sony VGP-BPS8 Sony VGP-BPS8A

World and China’s battery Vanadium view of the market in recent years will continue to maintain a relatively rapid pace of growth, market prospects are very good. More precisely from the data, estimated that by 2010 the world market for vanadium batteries will reach 1.075 trillion yuan, up 74.8% over 2008, while in 2020 the size reaches 7 25 trillion yuan, against a growth of 574.42 percent in 2010. From the Chinese perspective, 2010, China’s battery market vanadium reach 527.5 billion yuan, growing 39.22% over 2008, while in 2020, the size will reach 1.63 trillion yuan more in 2010 rose to 209%.

Investment value of vanadium battery

With wind, solar and other clean resources, extensive use of its power generation does not become an obstacle to the stability of defects are a major obstacle to the development of its depth. If there is no great capacity, a storage device to provide secure support for the development of clean energy is an empty word. Storage devices in the clean energy sector as a whole is a very important link in the chain, while the vanadium battery for his own benefit in the future development of devices for energy storage will play an important role. PA3399U-2BRS PA3465U-1BRS

Vanadium battery is a strong growth momentum, a green battery excellent, it has a particular cellular structure, depth of discharge at high current density, load quickly, high energy, low cost, in the large scale storage in lithium-ion energy, Ni-MH unmatched price-performance advantage. And manufacture of complex and expensive compared to fuel cells, both in the large-scale storage of energy, or application prospects vehicle power, the vanadium battery is more competitive force can be used as production systems to support clean solar energy storage devices for energy for hybrid and electric cars. In addition, the scope of the internal battery of vanadium is still in the market are not in the marketing process is required to have a number of investment opportunities.

At the same time promote the use of vanadium batteries in line with current government energy-saving emission reduction strategy advocated by a national scale. Vanadium battery for its efficiency of energy conversion, storage capacity of electricity, operational safety and environmental benefits such as friendly to allow the final energy consumption of China, fundamental changes have occurred, you can achieve greater energy efficiency, conservation of existing energy resources and reduce pollution, and ultimately to achieve energy savings targets for reducing emissions. Satellite A80 battery Satellite M100 battery

In addition, the location of China’s commercial technology batteries Vanadium achieved a major breakthrough has been that a number of key core technologies have complete independence of intellectual property rights, the vanadium battery that provides investment significant technical support. Here we have common prefecture-level cities in China, for example, if the peak value of about 500 million kilowatts will be 10 hours of peak power of the all-vanadium battery Duan Duan Gu Energy Supply energy storage.

However, the need to remind investors to note that does not mean that there is technically no problem. For example, first, the cathode of battery vanadium vanadium pentavalent liquid at temperatures above 45 degrees Celsius, or put aside for the case of precipitation of vanadium pentoxide easily precipitate precipitation precipitation plug flow channel, the Felt carbon fiber coating, deterioration of electrical performance of the reactor until the battery disposal, while the stack in the long term the process temperature of the electrolyte can easily exceed 45 degrees Celsius. Secondly, the graphite plate etching liquid to be positive if the user is working properly, the graphite sheet can be used for two years, if the user misuse, a charge will be able to complete the burning graphite plates The battery can not be discarded. Under normal circumstances of use, every two months by a professional should conduct an interview, the maintenance costs of such a fund with high frequency, effort. Latitude D620 battery Latitude D820 battery

In addition to technical issues, the vanadium battery problems, it is still too expensive. With a battery of five kilowatts, for example, (a cube electrolyte, 1.8mol / L) 17 million control system 10 million euros, divide 70000, chassis 40000, the graphite plates 15,000, 07000 pump, carbon estimated 04000, a total of 406,000 is the cost of core subjects, but does not include the cost of secondary materials and labor costs. Thus, five kilowatts of vanadium batteries cost more than 400,000 higher than the cost of the same size lead-acid repeatedly. The vanadium battery popularize provide significant barriers.

Carbon-Lithium Iron phosphate coating as effectively improve the performance of the method is now more and more attention. FRU 92P1141 40Y6799 Researchers have begun a systematic study of different carbon sources, carbon-coated layer of the composition of the thick layer of carbon coating on the effects of electrochemical properties of lithium iron phosphate. Zhao, Zhejiang University, recruits, etc. [33, 34] using polypropylene as an alternative to toner source of inorganic carbon, respectively FePO4 source of iron and Fe2O3 via solid state synthesis reaction step of LiFePO4 / Composites C, the results of research show that the decomposition at high temperature polypropylene carbon to effectively prevent the aggregation of grains LiFePO4 grew up in different Fe3 + iron source to be the product of the powder are slightly ball, the difference is very Small form, particle size of 300 ~ 600nm between the initial discharge capacity of both the difference is not large, was 160 mAh / g (0.1C) or so. Zhao advantage of this approach are summarized in [34]: the decomposition of polymer products (state of the H atom and C) have a stronger reduction of the state of carbon materials, which can reduce the temperature Synthesis and shorten the reaction time, polymerization decomposition of carbon atoms in the reaction system the state level has been decentralized, thereby achieving a uniform coating of synthetic products, and the formation of particles connected with each Other films of conductive carbon, solid-phase synthesis in the carbon film coated in situ reduces the particles of lithium iron phosphate has grown in speed, thus contributing to the particle size of cathode material for effective control. Doeff, etc. [35, 36] NF343 G1947 studied the different sources of carbon and the carbon coating in situ on the structure of the surface layer on the electrochemical performance of LiFePO4, they think of carbon fiber and carbon nanotubes can significantly improve the performance of lithium iron phosphate, LiFePO4 / C composite material performance also depends on the structure rather than the content of carbon and its electrochemical performance is strongly dependent on the surface of the carbon layer of carbon and graphite disordered in the proportion of parts in carbon, graphite carbon materials with high magnification report better performance, and As the conductivity of carbon graphite sp2 hybridization of carbon sp3 hybrid and electric is higher than the conductivity of carbon disordered, so that the electrochemical performance of LiFePO4 with the coating layer of carbon in the ratio of SP2/SP3 positive correlation, Figure 2 for LiFePO4 / C composite material and structure of carbon materials, the relationship between the electrical conductivity. Dominkó, etc. [37] using Sol - gel prepared with different thicknesses of the layer of porous carbon, crystallization good LiFePO4 / C content of carbon composites and the relationship between the thickness of the layer of carbon coated and found that the thickness of the coated carbon increases the carbon content (from 1nm to 10nm), the carbon content of 3.2% (for coated thick layer of carbon about 1 nm), the lens exit 1C of their specific capacity of approximately 140mAh / g. PB994A PP2182D

4. Important synthetic route of progress and industrialization

Materials of lithium iron phosphate, the synthesis methods can be divided into solid phase method and liquid phase chemical method in the very process of industrial production is generally the introduction of ball-milling, spray or freeze-drying [38], and granulation, crushing and screening or air and other means of improving process capability.

Synthesis of lithium iron phosphate of the track may be used by different sources of iron, or ferrous salt as a source of iron, ferrous salinization legitimate “and” source of law of ferric iron compounds. “Source of iron the ferrous salt in the solid state sintering method of typical materials include oxalate, ferrous Li2CO3 and NH4H2PO4 or (NH4) 2HPO4 [4], a mixture of raw materials under the inert gas after sintering; ferric phase method solid source approach Sony in Valencia, and represented the source of iron oxide or iron phosphate, Shanghai Jiaotong University, MA Zi-Feng et al [39] also made a similar Sony, with phosphate ferric iron as a source of great ball milling energy. Process solid phase is characterized by the process intuitive and quality of the material capacity and volume ratio were greater than the capacity, the production process can achieve ultra low emissions. However, solid phase method difficult to measure the precise chemical control of raw materials, process route selection is important for the requirements of process control are very high. Valencia is the successful adoption of the method solid phase to achieve the industrialization of a typical representative of the society around the “CTR” means to apply a large number of patents phosphate material. PA3191U-4BRS  PA3285U-1BRS

Liquid-phase chemical methods generally adopt the “legal ferrous salt, are synthetic carbon-coated lithium iron phosphate doped sub-micron and Nano-particles effective means of common methods of liquid phase chemical synthesis are essentially the hydrothermal method [ 12, 40 -42], Solvothermal [43], the gel - sol-gel method [37, 44], the method of co-precipitation [45] and so on. By the hydrothermal synthesis method, for example, use generally LiOHH2O, H3PO4 and water-soluble ferrous salt (as FeSO4) as the precursor, the reaction at low temperature hydrothermal by a number of hours LiFePO4 direct synthesis. reaction conditions Liquid-phase synthesis of the advantages of low temperature (low energy), flexible and controllable, the product structure of homogeneous composition (a small amount of synthesis) can be synthesized nano-particles, disadvantage is that when production equipment to large scale, demanding, not easy controlling the oxidation of ferrous ions is not easy to achieve a real sense of the wording of the measure chemicals, materials, performance and stability, not easy to control the batch, and easy to produce programs pollutants and sewage. For the gel - sol-gel, it is reaction time is too long Er Shi has seriously reduced the productivity problem. Methods of synthesis in liquid phase there is an obvious disadvantage is that synthetic materials, press on the density below the capacity of the small volume of material, the battery manufacturing process, the transformation of matter is very difficult (mixing and embedding). Hydro-Quebec is a typical representative of chemical methods in liquid phase, materials , particles of lithium iron phosphate in a particle diameter of 50 ~ 250 nm between the magnification of the 1C discharge capacity at room temperature is higher than 140mAh / g, 60 ℃ under 0.25C/1C charge and discharge 400 times the capacity retention rate from 98.2% [46]. PA3468U-1ACA PA3097U-1ACA

To date, reported publicly have large volumes of manufacture of phosphate lithium iron-based cathode materials for lithium-ion batteries the company of only two U.S. companies Valence Technology [47] and A123systems [48]. The first claim is the first commercial company to iron phosphate lithium battery, which says that its nano-phosphate batteries with features ultra-high power is now the company has received Sequoia Capital, General Electric, Motorola, Qualcomm and d other companies 1.5 100 million U.S. dollars of investment products, including batteries of professional power tools, HEV (Hybrid Electric Vehicle) Battery, PHEV (Plug-in) battery and the BEV (battery EV) battery. In Japan NTT, Mitsui has also actively developed the lithium iron phosphate material [49]. Mainland China and Taiwan, as some manufacturers to join the ranks of the evolution of material, some manufacturers have made progress [50-52]. PPP012L F1781A

5 Conclusion

Intrinsically safe, non toxic, greener, rich in raw materials, high performance lithium-ion battery cathode material lithium iron phosphate lithium-ion battery materials is to achieve from mobile phones, laptops and other applications small scale through professional power tools, emergency power, light electric vehicles, hybrid electric vehicles, energy storage, and other large aerospace applications to important documents. To overcome the low conductivity of the material to bring the application of the barrier, the researchers of materials, including nano-based particles, the surface coated with carbon and a large number of body modification such as doping, and d ‘try a variety of effective synthetic methods for controlling material performance. The success of the industrialization of U.S. companies will quickly drive the internal material lithium iron phosphate and related industries. PA3396U-1ACA PA3467U-1ACA

1 Introduction

Lithium-ion KD186 NF343 battery is a device very energy efficient and compact storage. Lithium-Ion trend in technology development is the pursuit of superior quality and volume of the specific energy, higher power, and longer service life, cost of ownership, while more the emphasis on adaptability of the machine’s environment and security applications from mobile phones, laptops extended to power tools, light electric vehicles, hybrid electric vehicles, telecommunications prepare electricity, l ‘Aeronautics and space to other areas. The safety of lithium-ion has been the industry and the community aspect of the research. The solutions include [1]: designing the physical structure of the battery safety, using a higher thermal stability of electrode materials, using organic additives or inorganic electrolyte, divide the three levels or composite organic / inorganic (ceramic) composite structure [2], change the traditional electrode materials for oxidation-reduction of organic matter, free radical reactions [3].

From a security problem occurs to see the mechanism of chemical reaction, select the electrochemical and thermal stability of lithium-ion battery electrode materials is to prevent abuse of batteries led to security problems the most elementary and middle most important. LiNi0.5Mn0.5O2 high-capacity cathode material and LiNi1/3Co1/3Mn1/3O2-based nickel and cobalt-manganese ternary layered material (patent 3M) less LiCoO2 safety have been greatly improved, but these oxides La thermal stability is not satisfactory. ThinkPad R40 battery ThinkPad X60 battery To LiFePO4 structuring represented by polyanionic phosphate materials because of their outstanding intrinsic safety, life cycle length, the wide electrochemical window, low cost and other characteristics [4] has been examined closely. Phosphate also include materials with high oxidation-reduction of a compound intercalation of electrons as LiMnPO4 [5-7], LiVPO4F [8-10], LiCoPO4 [11, 12], LiNiPO4 [11] , and features high electrochemical capacity of multi-electron Redox intercalation compound, such as Li2NaV2 (PO4) 3 [13] and Li3V2 (PO4) 3 [14, 15]. This article focuses on the most mature of phosphate - the material of lithium iron phosphate, the latest research and progress of industrialization.

2 Lithium Iron Phosphate inherent structure, physical properties and application of the barrier

LiFePO4 olivine structure is a polyanionic phosphate PO bond is very strong materials, thermodynamic stability, the use of safe and reliable, is currently the most talked about one of the subjects of the lithium-ion battery cathode . The material is completely incapable of electrochemical intercalation of lithium, the network, b axis contracted by 5% and 3.6%, c-axis direction of elongation of 2%, the size of the bias network smaller, about 6.6%, the lattice strain is low, material structural stability, life cycle very long. LiFePO4 has also a non-toxic, hp Pavilion dv8000 battery  hp Pavilion dv4 battery environmentally friendly, rich in raw materials capacity (theoretical capacity of 169 mAh / g platform) and the coulomb efficiency is high and stable, loading and unloading (3.45 V Li vs. / Li +), high energy and the specific benefits of specific power, if the material is appropriate for safety, cycle life, power characteristics, such as the use of cost-sensitive applications to battery scale.

LiFePO4 charge and discharge process can be broadly described as: LiFePO4FePO4 Li + + + E. At room temperature, the behavior of LiFePO4 lithium intercalation de-FePO4 training and is actually a dual interface LiFePO4 phase two process reaction phase [4]. Newman [16] Yamada [17], Dodd [18] respectively, a systematic study of the process of loading and unloading process LixFePO4 phase transition (see Figure 1).

LixFePO4 is a typical mixed ionic conductor electronic bandgap of 0.3 eV, the electronic conductivity of the ambient temperature is very low, about 10-9S/cm; LixFePO4 room temperature ionic conductivity is very low (~ 10-5S / cm), the characteristics of olive stone construction makes the body of the Proliferation of lithium-ion F4809A F4812A channels (only reach the quasi-one-dimensional diffusion), the LixFePO4 off a reaction in two phases lithium intercalation, LiFePO4 FePO4 and theoretical lithium-ion the diffusion coefficient of around 10-8 cm2 / s, and 10-7 cm2 / s [19], while the actual measure of LiFePO4 lithium-ion and FePO4 the “effective” diffusion coefficient may be lower than the theoretical value of 7 orders of magnitude, respectively, 1.8 × 10-14 cm2 / s and 2 × 10-16 cm2 / s [20]. So, make LiFePO4 for lithium-ion battery cathode material must also improve their electronic conductivity and ionic conductivity, improving its capabilities electrochemical interface.

3 Material Lithium iron phosphate method modified

On lithium iron phosphate to improve the electrical conductivity of the main methods include: granular nano-technology; coated conductive layers, such as nano-carbon layer, the right to conduct body doped lithium iron phosphate, synthetic material Lithium Iron phosphate in the surface of a good electronic conductivity Fe2P, and Fe3P phase Fe15P3C2, improving materials of lithium iron phosphate, the surface morphology, as Valence Technology Inc. has proposed a (CTR carbothermic Reduction ) method [21] will be conductive carbon particles dispersed in phosphate. Nano particle materials lithium-ion battery is to improve the conductivity of the most commonly used. Lithium PA3421U-1BRS PA3591U-1BRS iron phosphate, reducing the particle size and shorten the effective diffusion of lithium ions travel, can effectively improve the ionic conductivity of the material. Granular materials, nano-technology will reduce the electronic conductivity, it is usually also the introduction of synthetic materials, the doping of metal ions and conductive material coated on the other hand, carbon coated in situ, particular can effectively control carbon coated lithium iron phosphate materials, nano-size particles. Material lithium iron phosphate synthesis itself, we are often several methods used in the same time, the role of co-existence of several mechanisms.

Changing the doping is to improve the functional electrical properties of electron transport and electric or ion to improve the structural stability of materials, the most common. Lithium iron phosphate is often used to driving on the mass of doped metal ions, including Mg2 +, Ni2 +, Co2 +, Al3 +, Ti4 +, Zr 4 +, Nb5 +, W6 +, etc. [21-24]. Chunsheng Wang et al [22] The study showed (see Table 1), doped with magnesium can significantly improve the electronic conductivity of lithium iron phosphate, and a modest increase in ionic conductance, the combined effect of the electronic conductivity and ionic conductivity in the same order of magnitude, the electron-doped A1022 A1185 Neither the rate of increase in conductivity is dominant, but the ionic conductivity is virtually unchanged, at 25 ℃, LiFe0.95Mg0.05PO4 magnification feature much better than LiFe0.95Ni0.05PO4. Nian 2002 MIT Materials Science Department of Chiang YM research group reported the results of attention [24], the study found that the material of lithium iron phosphate doped with Nb5 + and other metal ions in the 4a position of Li hole generated after the carrier, the conductivity of materials increased to 3 × 10-3 ~ 4 × 10-2 S / cm, even more than the LiCoO2 cathode materials oxides (~ 10-3 S / cm) and LiMn2O4 (~ 10 -5 S / cm) conductivity.

However, Chiang YM concluded there is considerable controversy, including: doping can significantly improve the electronic conductivity of the material but, in fact, this period of conductivity of materials, measures may be lithium-ion diffusivity and ionic conductivity, nano-technology to reduce the lithium-ion diffusion May be difficult to explain the phenomenon of text, such a substantial increase in electronic conductivity of this material may not be boosted by the formation of Li1-xNbxFePO4 “but is another conductive material and a better ability to generate income. Nazar et al [25] that the iron phosphate lithium material body does not significantly improve the conductivity caused by doping, but because the synthesis process, particularly in high temperatures, easy-phosphate formed on the surface such as Fe2P conductive metal phosphides such as nano-network caused by network operators to improve the conductivity of grain boundaries phosphate. TravelMate 290 battery BATBL50L6 Prosine, etc. [26] found that non-doped nano-or sub-micron (100 ~ 150nm) Supports Lithium iron phosphate 3C flow below the same time have a good zoom feature. Masquelie etc. [27] found that even without doping, uncoated carbon, particle size about 140 nm in lithium iron phosphate below 5C discharge rate is 147mAh / g capacity of specific high They also believe that [28] simply can not be Nb-doped lithium iron phosphate is generated in the so-called “Li1-xNbxFePO4″ materials to improve electronic conductivity of lithium iron phosphate to improve its performance electrochemical mainly attributed to NbOPO4 and / or (Nb, Fe, C, O, P) network of driver training. In fact, in 2001, Yamada et al [29] had already proposed to reduce the particle size material is overcome Lithium iron phosphate Lithium-Ion scattering effectively the problem is limited. YM Chiang and so on in recent years have begun to focus on nanoparticles of lithium iron phosphate end of a study (the United States Patent Application: US2007/0031732A1 and US2007/0190418A1).

Carbon in iron phosphate coating of lithium material is also to improve the performance of the most commonly used modified carbon coating of lithium iron phosphate can not only improve the electronic conductivity of materials, but also can effectively control the particles of iron phosphate lithium in grain growth, is to obtain nano-particles, improve the capacity of lithium-ion diffusion of effective ways. University of Montréal, Hydro-Quebec Research Institute and the University of Texas Goodenough carbon in organic carbon coated group conducted a series of effective methods of research, and its greatest impact. In 1999, Ravet, Goodenough and et al [30] first proposed organic compounds (sucrose) as a carbon source for the lithium iron phosphate material in-situ modified carbon-coated, was found at a high temperature 1% of carbonaceous materials, lithium iron phosphate of the 1C discharge capacity of the microscope up to 160 mAh / g was close to the theoretical capacity, which is better than Padhi, and Goodenough [4] in 1997 reported the results of a new qualitative leap since become the modified carbon, iron phosphate coated Lithium is one of the methods most important change. In 2001, PCGA-AC16V6 PCGAAC19V3 Nazar et al [31] a combination of carbon coated, and the concept of nano-particles, the first truly shows the carbon-layer nano-or sub-micron scale, lithium iron phosphate has a very characteristic high magnification (magnification 5C, the maximum capacity 120mAh / g), the results show that carbon-coated lithium iron phosphate can also improve the electronic conductivity and ionic conductivity. Nazar, etc., but not the carbon content and particle size of lithium iron phosphate is optimized, and takes into account the volume ratio of materials, energy issues (carbon content of the text up 15%, will significantly reduce the density of matter from the tap). Dahn et al [32], then try a variety of ways carbon coated to reduce expectations of LiFePO4 / C composite electrode of carbon to improve the overall quality of the material energy, the ratio of the volume and energy tap density, they stressed that the right to lead iron phosphate coated carbon amendment must be comprehensive review of synthetic materials and preparedness capacities, capacity expansion, and the tap density effects. In 2003, Valencia in Baker et al [21] reported the use of “carbon thermal reduction (CTR-carbothermal Reduction) Preparation of coated carbon (carbon modified formulation May be more appropriate) and iron materials phosphate lithium, methods dihydrogen oxide, lithium iron as main raw material, carbon as reducing agent and carbon source, carbon thermal reduction method using the synthetic material and the discharge capacity up to 156 mAh / g ; The synthetic method is a notable feature of the synthesis of matter incorporation of metal ions, while the carbon can be dispersed in tiny particles, while diffusion in the secondary particles, the conductivity of materials is very good . Valencia provided product information to see, the CTR is not only, as mentioned in the text is probably the best way to achieve industrialization, also appears to be integrated optimization of materials, capacity, capacity of ‘expansion and tap density of the ideal way. apple iBook G4 12 inch battery apple iBook G4 14 inch battery