Digital battery

1, the profile of lithium-ion battery electrolyte

 

The electrolyte is a lithium-ion four core subjects (cathode, anode, separator, electrolyte) one, known as the lithium-ion “blood,” Chiang Kai-shek to the battery negative role of electrons conduction from the game, a lithium-ion batteries have been high-voltage, high specific energy and other benefits of the warranty. Electrolyte solvents of high purity generally organic electrolyte lithium salts (lithium hexafluorophosphate, LiPF6), the required additives, raw materials, under certain conditions, formed by a certain percentage of the preparation. VGP-BPL11 VGP-BPS12 VGP-BPS14/S

 

Secondly, the types of electrolyte lithium-ion

 

1, the liquid electrolyte

 

Selection of the electrolyte on the performance of lithium-ion batteries are very large, it takes a good chemical stability, especially in high potential and high temperature environment less prone to breakdown, with a high ionic conductivity ( > 10-3 s / cm), and the anode and cathode materials must be inert, they can not invade the rot. As the battery lithium-ion battery and discharging potential and the anode material with a high chemical reactivity of lithium, the electrolyte must not contain water with organic compounds. However, the ionic conductivity of organic matter are not good, then soluble in organic solvents by adding salt to increase the conductivity of the ionic conductivity. Current lithium-ion batteries are mainly used liquid electrolyte, the anhydrous organic solvent such as EC (ethyl carbonate), PC (propylene), DMC (dimethyl carbonate), DEC (diethyl carbonate), the majority of solvents mixed, such as EC2DMC and PC2DMC. Conducting salt with L iClO4, LiPF6, LiBF6, Lia and SF6 LiOSO2CF3, the order of their conductivity LiAsF6> LiPF6> LiClO4> LiBF6> LiOSO 2CF3. Due to the high oxidation LiClO4 prone to outbursts of security issues, generally limited to experimental studies, easily purified LiAsF6 high ionic conductivity and good stability, but contain toxic, restricted use; LiBF6 Chemistry and good thermal stability and conductivity is not high, Lio SO2CF3 low electrical conductivity and corrosion of the electrodes are under appeal; Although LiPF6 decompose, but with a higher ionic conductivity, until the lithium battery ion is to use LiPF6. Current commercial lithium-ion battery electrolyte used in most cases the LiPF6 EC2DMC, it has a high ionic conductivity and good electrochemical stability. VGP-BPS10A/B VGP-BPS10B VGP-BPS11

 

2, solid electrolyte

 

Directly with lithium metal as anode materials with high reversible capacity, the maximum theoretical capacity of 3862mAh · g-1, is a graphite material 10 times, lower prices, is considered a new generation of lithium-ion batteries The most attractive anode, but to produce lithium dendrites. Using solid ionic conductivity of electrolytes such as lithium may inhibit the growth of dendrites, which makes it possible for the anode materials of lithium. In addition, the use of solid electrolyte leakage of electrolyte fluid to avoid the shortcomings of the battery can be thinner (thickness of only 0.1mm), higher energy density, smaller batteries of high energy. destructive experiences show that security at the solid-state lithium-ion battery is high, nailing through the heating (200 ℃), short circuit and cooler (600%) and other experience destructive, the liquid leakage of electrolyte lithium-ion occurs, explosions and other safety issues, and cells in solid within the temperature slightly higher than outside (< 20 ℃) there are no other safety issues. Solid polymer electrolyte has good flexibility, film formation, stability and low cost, both positive and negative electrodes as an electrolyte membrane with the ions can be used as a transfer. VGP-BPS13/S VGP-BPS10 VGP-BPS10A

 

solid polymer electrolyte can be separated into dry form solid polymer electrolyte (SPE) and gel polymer electrolyte (GPE). SPE solid polymer electrolyte are mainly made of polyethylene oxide (PEO), the drawback is a lower ionic conductivity at 100 ℃ can reach 10-40cm. ion conduction in the SPE is primarily in the amorphous region, with the movement of polymer chains pass migration. Easy crystallization of PEO molecular chains because of its great regularity, and crystal technology to reduce the ionic conductivity. Thus, to improve the ionic conductivity of one hand to reduce the crystallinity of the polymer chain mobility increases, the other can improve the conductivity of salt in the solubility of the polymer. The use of graft, block, crosslinking, copolymerization and other means of destroying the crystallization properties of polymers can significantly improve the ionic conductivity. In addition, complexes of inorganic salts can be added to improve the ionic conductivity. In the solid polymer electrolyte by the addition of high dielectric constant of the liquid low molecular weight organic solvents such as PC can greatly improve the conductivity of the solubility of salt, the composition of the electrolyte is PEG polymer gel electrolyte, which in high ambient temperature ionic conductivity, but the process will be in the use of liquids and failure analysis. Gel polymer lithium-ion batteries have been commercialized. Sony VGP-BPS12 battery Sony vgp-bps13 battery

 

Third, the tendency to develop electrolyte materials

 

Lithium-ion battery with its own full benefits is in a much larger group of industries - from automotive battery in the field. To respond to this great group of industries, materials for lithium ion electrolytic future trend of development will focus on new solvents, ionic liquids, additives, lithium salt Deng Fang Mian, and the new Zheng Xiang Pipei equipment negative if the lithium-ion batteries safer food, higher, capacity, security and ultimate convenience applied to electric vehicles, energy storage, aerospace and larger area.

 

Industry lithium-ion to meet the needs of future development, we must develop a high-security, high environmental adaptability of electrolyte materials of the battery. Mostly electrolytic solvent, the choice of solute and additives for consideration:

 

(1) to select a wide range of working temperatures of solvents, melting point solvent of the best from -40 ℃ below the boiling point preferably above 150 ℃ or more, wide electrochemical window solvents better prevent the state of charge under the redox electrolyte, while the cycling stability can increase the battery. For example, consider the use of ionic liquids, a new solvent, multi-component solvent, so as to solve the battery of safety and adaptability of the environment. apple powerbook g4 17-inch battery apple macbook 13 inch unibody battery

 

(2) Select the appropriate fluid to improve the battery to the environment. Now commonly used LiPF6 (lithiumfluorophosphate) decomposition temperature is low, 60 ℃ and a small amount of decomposition at high temperatures or in harsh environments, the decay has significantly increased, resulting in HF (hydrofluoric acid) and other free acid to acid electrolyte, the electrode material, causing damage and rapid deterioration of battery performance.

 

(3) may consider adding the right amount of flame retardant additives, redox shuttle additive to protect the positive and negative film-forming additives. Flame retardant additives can be used to ensure that the internal battery thermal runaway, the electrolyte does not burn a fire, so the battery safety can be guaranteed. With the role of the redox shuttle additive is to prevent, especially when the battery battery during use due to abnormal conditions, single battery charge would be too frequent or too high, causing rapid deterioration of performance battery, which affects the whole group’s performance and battery usage, and even the occurrence of a security risk. With a film positive and negative is the role of additives that can effectively protect the anode and cathode materials and electrolyte in the charged state of the reaction of contact, through the film as a high degree of activity is negative and the electrolyte to be isolated to prevent the electrolyte response to the surface of the electrode. apple powerbook g4 12 inch battery apple powerbook g4 15 inch battery

 

Fourthly, the development of the global situation of the electrolyte of the lithium-ion

 

In recent years, the global lithium-ion battery electrolytes stable industry, the market mainly in Japan, Ube Corporation and ECOPRO (Cheil City) Company, the two companies represent approximately 50% of global market share. Filed in the following companies as follows: Mitsubishi Chemical, Toyama Chemical, Mitsui Chemicals, Kishida Chemical, Zhangjiagang Guotai glory and other businesses.

 

Fifthly, the development of the internal electrolyte of the lithium-ion

 

Made of electrolyte to penetrate the market in 2002 to gradually replace imported products, through continuous improvement and product quality has reached international advanced level. Currently supports the manufacturers of electrolytic cells were localized mainly use imported only a small portion of the electrolyte. apple macbook pro 15 inch battery apple macbook pro 17 inch battery