Electrolyte and its preparation method and application
An electrolyte and electrolyte additive technology, applied in the field of lithium batteries, can solve the problems of battery gas production and cycle performance deterioration.
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Embodiment 1
[0057] (1) Inject a part of the main electrolyte (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) (accounting for 75% of the total battery weight) into the battery (the positive pole of the battery is NCM ternary (LiNi 0.8 co 0.1 mn 0.1 o 2 ) material, the negative electrode adopts pure graphite respectively) and charge and form at 0.05C to generate a solid electrolyte interface film on the negative electrode surface of the battery;
[0058] (2) Another part of the electrode solution body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) and the electrolyte additive (compound shown in formula 1, X is -CH 2 , the amount added is 0.5wt% of the weight of the electrolyte) into the battery.
Embodiment 2
[0060] (1) Inject a part of the electrolyte body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) (accounting for 80% of the total battery weight) into the battery (the positive pole of the battery is NCM ternary (LiNi 0.8 co 0.1 mn 0.1 o 2 ) material), the negative electrode adopts graphite doped with 10wt% Si) and charges and forms it at 0.15C to generate a solid electrolyte interface film on the surface of the negative electrode of the battery;
[0061] (2) Another part of the electrode solution body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) and the electrolyte additive (compound shown in formula 1, X is -C 2 h 4 , the amount added is 0.01wt% of the weight of the electrolyte) into the battery.
Embodiment 3
[0063] (1) Inject a part of the main electrolyte (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) (accounting for 85% of the total battery weight) into the battery (the positive pole of the battery is NCM ternary (LiNi 8 co 1 mn 1 o 2 ) material, the negative electrode adopts Si material) and then charge and form at 0.25C to generate a solid electrolyte interface film on the surface of the negative electrode of the battery;
[0064] (2) Another part of the electrode solution body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) and the electrolyte additive (compound shown in formula 1, X is -C 3 h 6 , the amount added is 1wt% of the weight of the electrolyte) into the battery.
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