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release time:2023-08-04
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The selection of electrolytes has a significant impact on the performance of lithium-ion batteries. They must have good chemical stability, especially in high potential and temperature environments where decomposition is not easy, have high ion conductivity (>10-3s/cm), and must be inert to the cathode and anode materials and cannot corrode them. Due to the high charge and discharge potential of lithium-ion batteries and the presence of chemically active lithium embedded in the anode material, the electrolyte must use organic compounds and cannot contain water [10]. But the ionic conductivity of organic compounds is not good, so soluble conductive salts need to be added to the organic solvent to improve the ionic conductivity. At present, lithium-ion batteries mainly use liquid electrolytes with anhydrous organic solvents such as EC, PC, DMC, DEC, and most use mixed solvents such as EC-DMC and PC-DMC. Solid polymer electrolytes can generally be divided into dry solid polymer electrolytes and gel polymer electrolytes. Due to its excellent flexibility, film-forming ability, stability, and low cost, solid polymer electrolytes can be used as separators between positive and negative electrodes and as electrolytes for ion transfer.
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