Liquid injection formation method of lithium ion battery
A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of charge and discharge capacity attenuation, poor high-temperature cycle performance, cycle life attenuation, etc., and achieve the effect of improving stability and improving binding performance
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Embodiment 1
[0030] 1), inject the first electrolytic solution, the first electrolytic solution accounts for 65% of the total electrolytic solution volume, the first electrolytic solution includes 1.0mol / L lithium hexafluorophosphate, and the volume ratio is 1:1:1 methyl carbonate Ethyl ester, a mixed solution of diethyl carbonate and ethyl carbonate, and 4% fluoroethylene carbonate (FEC);
[0031] 2), pulse charging, the current of the pulse charging is 0.1C, until the voltage reaches 3.2V, the charging time of the pulse charging is 0.5min, and the interval is 30s;
[0032] 3), pulse discharge, the current of the pulse discharge is 0.1C, until the voltage reaches 3.0V, the discharge action time of the pulse discharge is 0.5min, and the interval is 30s;
[0033] 4), repeat steps 2) and 3) 5 times, let stand for 4h;
[0034] 5), inject the second electrolytic solution as the balance, the second electrolytic solution comprises lithium hexafluorophosphate of 1.0mol / L, and the volume ratio is...
Embodiment 2
[0039] 1), inject the first electrolytic solution, the first electrolytic solution accounts for 70% of the total electrolytic solution volume, the first electrolytic solution includes 1.0mol / L lithium hexafluorophosphate, and the volume ratio is 1:1:1 methyl carbonate Ethyl ester, a mixed solution of diethyl carbonate and ethyl carbonate, and 6% fluoroethylene carbonate (FEC);
[0040] 2), pulse charging, the current of the pulse charging is 0.2C, until the voltage reaches 3.3V, the charging time of the pulse charging is 10min, and the interval is 60s;
[0041] 3), pulse discharge, the current of the pulse discharge is 0.2C, until the voltage reaches 3.1V, the discharge action time of the pulse discharge is 10min, and the interval is 60s;
[0042] 4), repeat steps 2) and 3) 5 times, let stand for 4h;
[0043] 5), inject the second electrolytic solution as the balance, the second electrolytic solution comprises lithium hexafluorophosphate of 1.0mol / L, and the volume ratio is 1...
Embodiment 3
[0048] 1), inject the first electrolytic solution, the first electrolytic solution accounts for 65% of the total electrolytic solution volume, the first electrolytic solution includes 1.0mol / L lithium hexafluorophosphate, and the volume ratio is 1:1:1 methyl carbonate Ethyl ester, a mixed solution of diethyl carbonate and ethyl carbonate, and 6% fluoroethylene carbonate (FEC);
[0049] 2), pulse charging, the current of the pulse charging is 0.2C, until the voltage reaches 3.2V, the charging time of the pulse charging is 5min, and the interval is 30s;
[0050] 3), pulse discharge, the current of the pulse discharge is 0.2C, until the voltage reaches 3.1V, the discharge action time of the pulse discharge is 5min, and the interval is 30s;
[0051] 4), repeat steps 2) and 3) 5 times, let stand for 4h;
[0052] 5), inject the second electrolytic solution as the balance, the second electrolytic solution comprises lithium hexafluorophosphate of 1.0mol / L, and the volume ratio is 1:1...
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