Dynamic electrolyte for lithium ion battery
A lithium-ion battery and electrolyte technology, applied in the field of electrolyte for lithium-ion batteries, can solve problems affecting battery capacity and service life, achieve high capacity, good cycle life, and improve performance
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Embodiment 1
[0031] Ethylene carbonate, propylene carbonate, methyl propyl carbonate, and dipropyl carbonate of the carbonate solvent are mixed uniformly according to 26.43%, 11.32%, 12.94%, and 24.81% of the total liquid weight, and then 12.5 %LiPF 6 , add in three times on average, the time interval between each addition is 1.5 to 2.0 hours, shake well after adding, and then add film-forming additives of vinylene carbonate 1.0% and propylene sulfite 2.0%, anti-overfilling additive cyclohexylbenzene 7.0%, flame retardant trifluoromethyl phosphate 2.0%. The entire preparation process of the electrolyte is operated in a glove box, the glove box is in an argon environment, the temperature in the box is controlled within 25°C, and the moisture is below 1ppm.
[0032] This electrolyte solution was injected into the battery and tested.
[0033] The batteries used are:
[0034] Preparation of positive electrode: active material LiCoO 2 The content of carbon black is 94%, carbon black is 3.0%...
Embodiment 2-7
[0047] Example 1
Embodiment 8
[0049] With embodiment 1, just change the cyclohexylbenzene of anti-overcharge additive into p-xylylene dimethyl ether, change the trifluoromethyl phosphate of flame retardant into 2,2,2-trifluoroethyl phosphate, and The ethylene carbonate in the film-forming additive is replaced by 1,3-propiolactone sulfonate, the propylene sulfite is replaced by vinyl sulfite, LiPF 6 Replaced by Li(CF 3 SO 2 ) 2 N and do the various tests described in Example 1 with regard to the resulting electrolyte.
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