A dry method for preparing lithium battery lithium-replenishing negative electrode sheet
A technology for lithium batteries and negative electrodes, which is applied in the field of lithium supplementary negative electrodes for lithium batteries prepared by dry method, which can solve the problems of high environmental control requirements, fire and explosion, high activity, etc., and achieve simple operation, cost saving, and improved Coulombic efficiency and cycle The effect of longevity
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Embodiment 1
[0044] This example relates to a dry method for preparing a lithium-replenishing negative electrode sheet for a lithium battery; based on the weight percentage of the total powder weight, the negative electrode powder of the negative electrode sheet includes: 1wt% carbon black, 1wt% CNT, 70wt% graphite , 10wt% silicon oxide, 4wt% PTFE, 5wt% PAA, 3.5wt% lithium-ion solid electrolyte, 2.5wt% lithium carbonate-coated passivation lithium powder, 3wt% calcium stearate;
[0045] The method comprises the steps of:
[0046] A. Weigh 1wt% carbon black, 1wt% CNT, 70wt% graphite, 10wt% silicon oxide, stir and mix for 3 hours, the rotation speed is 1500r / min, and the stirring temperature is 25±2°C.
[0047] B. Use a jet mill to mechanically mix the dry powder obtained in step A, the inlet pressure is 1Mpa, and the feeding pressure is 0.7Mp.
[0048] C. Add 4wt% PTFE accounting for the total weight of the powder to the material obtained in step B, stir and mix for 2 hours, the rotation sp...
Embodiment 2
[0057] A. Weigh 1wt% carbon black, 0.5wt% CNT, 80wt% graphite, 5wt% silicon oxide, stir and mix for 2 hours, the rotation speed is 1000r / min, and the stirring temperature is 25±2°C.
[0058] B. Use a jet mill to mechanically mix the dry powder obtained in step A, the inlet pressure is 1Mpa, and the feeding pressure is 0.7Mp.
[0059] C. Add 4wt% PTFE accounting for the total weight of the powder to the material obtained in step B, stir and mix for 1 hour, the rotation speed is 2000r / min, and the stirring temperature is 25±2°C.
[0060] D. Add 3wt% PAA to the material obtained in step C, accounting for the total weight of the powder, stir and mix for 1 hour, the rotation speed is 3000r / min, and the stirring temperature is 25±2°C.
[0061] E. Add 3wt% lithium-ion solid electrolyte to the material obtained in step D, and stir for 2 hours at a speed of 2000r / min and a stirring temperature of 25±2°C.
[0062] F. Add passivated lithium powder coated with lithium carbonate accountin...
Embodiment 3
[0068] A. Weigh 1wt% carbon black, 0.5wt% CNT, 85.7wt% graphite, stir and mix for 2 hours, the rotation speed is 1000r / min, and the stirring temperature is 25±2°C.
[0069] B. Use a jet mill to mechanically mix the dry powder obtained in step A, the inlet pressure is 1Mpa, and the feeding pressure is 0.7Mp.
[0070] C. Add 4wt% PTFE accounting for the total weight of the powder to the material obtained in step B, stir and mix for 1 hour, the rotation speed is 2000r / min, and the stirring temperature is 25±2°C.
[0071] D. Add 3wt% SBR to the material obtained in step C, accounting for the total weight of the powder, stir and mix for 2 hours, the rotation speed is 2000r / min, and the stirring temperature is 25±2°C.
[0072] E. Add 2wt% lithium ion solid electrolyte and 1wt% sodium ion solid electrolyte to the material obtained in step D, and stir for 2 hours at a speed of 2000r / min and a stirring temperature of 25±2°C.
[0073] F. Add passivated lithium powder coated with lithiu...
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