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Lithium-ion battery electrolyte overview and basic requirements of electrolyte

Return Listsource:Gratene date: 2022-06-17

Lithium-ion battery electrolyte overview and basic requirements of electrolyteElectrolyte of chemical power supplies includes aqueous electrolyte and nonaqueous electrolytes. In addition to the factors of the electrode material, the advantages and insufficient lithium ion batteries are closely related to the properties of the electrolyte. Since the electrolyte is good, the electrochemical window width, the working voltage of the lithium ion battery (usually around 4V) is used to be used. Aqueous electrolyte battery (generally no more than 2V) is more than 1 time, and the lithium-ion battery has a high voltage and high-proportional energy. At the same time, the lithium ion battery has also had an important insufficient source of dry nonaqueous electrolytes. Non-water electrolytes The conductivity of the water-soluble hydrolysis electrolyte makes the high-magnification charge and discharge performance of the lithium ion battery are limited; the technical content and price of the electrolyte itself, resulting in high cost of the lithium-ion battery; organic liquid electrolyte The height of tenderness is a safety hazard that is difficult to overcome in liquid lithium ion batteries. Therefore, to overcome its insufficient basis based on the advantage of lithium ion battery, the electrolyte system of the lithium-ion battery must have some special nature.

Electrolyte for lithium-ion batteries should meet the following basic requirements:
A. The ion conductivity in a wider temperature range is high and the lithium ion migration is large to reduce the concentration of the battery during charge and discharge.
B, well thermal stability. To ensure the battery in the appropriate temperature range I.
C, the electrochemical window width, preferably from 0 to 5V electrochemical stability window to ensure that the electrolyte does not have a significant side reaction in the two poles, and satisfies the singleness of the electrode reactions in the electrochemical process.
D. When replacing the separator, there is a good mechanical properties and processability.
E, the price cost is low.
F, good security, high flash point or not burnt.
G, non-toxic contamination. Do not harm the environment.
These are the factors that measure the performance of electrolyte properties, but also important premise for high performance, low internal resistance, low price, long life and safety. 

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