What are the basic requirements for the electrolyte of lithium ion batteries?

The electrolyte is the battery negative ion conduction effect between conductors, charge and discharge process, the positive and negative electrode round-trip transport lithium ion.The electrolyte of battery charging and discharging performance of the high and low temperature) (ratio, life expectancy (circular storage), the influence of temperature has a larger scope.

Suitable solvent to its high dielectric constant, low viscosity, with alkyl carbonate in common use such as PC, EC, such as strong polarity, high dielectric constant, but the viscosity, molecular inter-atomic forces, in which lithium ions move slowly.Linear ester, such as DMC (dimethyl carbonate), DEC (diethyl carbonate) such as low viscosity, dielectric constant is low, therefore, in order to obtain high ionic conductivity of the solution, generally USES the PC + DEC, EC + DMC such as mixed solvent.

Used forLithium ion batteriesElectrolytes generally should meet the following basic requirements:

A. high ionic conductivity, generally should reach 1 x 10-3-2 x 10-2 s/cm;

B. high thermal stability and chemical stability, in a wide range of voltage separation does not occur;

C. a wide electrochemical window, in the wide voltage range maintain the stability of the electrochemical properties;

D. with other parts of cells such as electrode material and electrode set fluid and the diaphragm has good compatibility;

E.safe, non-toxic, no pollution.

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