Lithium ion electrolyte and lithium ion battery using same
A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as battery gas production or performance deterioration, and achieve the effects of improving battery performance, slowing down decomposition, and reducing the content of harmful substances
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[0012] Specific embodiment 1: This embodiment describes a lithium ion battery electrolyte, including organic solvents, lithium salts and additives. The organic solvents include A and / or B. The A is carbonate or fluorinated. Carbonate, said B is carboxylate or fluorocarboxylate; said lithium salt includes lithium hexafluorophosphate (LiPF 6 ), in addition, the lithium salt also includes high-content bistrifluoromethylsulfonimide (LiTFSI) and / or lithium bis(fluorosulfonyl)imide (LiFSI); the additives include negative electrode film-forming additives And / or positive electrode protection additives.
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[0013] Specific embodiment two: a lithium ion battery electrolyte according to specific embodiment 1, the carbonate is selected from ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate One or more; the carboxylic acid ester is propyl acetate, n-butyl acetate, isobutyl acetate, n-pentyl acetate, isoamyl acetate, ethyl propionate, n-propyl propionate, butyric acid One or more of methyl ester, ethyl n-butyrate or fluorinated solvent of the above solvents.
Example Embodiment
[0014] Specific embodiment three: a lithium-ion battery electrolyte described in specific embodiment 1, the lithium hexafluorophosphate (LiPF 6 ) The mass fraction in the electrolyte is 5%-20%, preferably 8%-14%; the mass fraction of the bistrifluoromethylsulfonimide (LiTFSI) in the electrolyte is 0.5% to 8%, preferably 3% to 6%; the mass fraction of lithium bis(fluorosulfonyl)imide (LiFSI) in the electrolyte is 0.5% to 6%, preferably 1% to 4%.
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