A high-voltage electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte
A technology of lithium ion battery and electrolyte, applied in the field of high voltage electrolyte and lithium ion battery, can solve the problems of poor cycle and low temperature effect, decrease of battery cycle performance, increase of positive electrode impedance, etc., so as to inhibit dissolution and improve conductivity. rate, the effect of suppressing the increase in impedance
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[0041] The high-voltage electrolyte is prepared as follows: in a glove box, ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) are prepared in a weight ratio of 25:5:65. After mixing, 5% mass fraction of the silicide organic solvent (1) is added to the mixed solvent; lithium hexafluorophosphate is added to dissolve, and an electrolyte with a lithium hexafluorophosphate concentration of 1M is prepared. After that, 0.2% of vinylene carbonate (VC), 5% of fluoroethylene carbonate (FEC), and 5% of 1,3 propane sultone (1,3-PS) were added to the electrolyte. ) And 0.5% lithium difluorophosphate (LiPO 2 F 2 ), plus 2% of polynitrile compound (5) and 5% of silyl compound (1).
[0042] Inject the prepared lithium-ion battery with high-voltage electrolyte into the fully dried 4.45V lithium cobalt oxide / graphite soft-pack battery, and after 45℃ shelving, high temperature fixture formation and secondary sealing, the battery performance test , The battery used in E...
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