An electrode sheet, its preparation method, and a solid-state battery with the electrode sheet
A technology of electrode sheet and conductive agent, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as easy to break, cannot change the diaphragm, and has no protective effect, so as to reduce the probability of spontaneous combustion and improve safety. Effect
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Embodiment 1
[0035] A method for preparing a negative electrode sheet, comprising the following steps:
[0036] Step 1, preparation of coating 1 and 2 slurry:
[0037]Weigh the negative electrode active material natural graphite, the conductivity agent SuperP, and the powder CMC and SBR of the binder. Among them, the mass ratio of natural graphite:SP:CMC:SBR=94:1:1:1, first dissolve CMC with deionized water, Then add natural graphite and SP respectively, and finally add SBR. When these components are completely dispersed, add deionized water to adjust the solid content of the slurry to 40%, and finally perform vacuum degassing for 4 hours to complete the coating-2 slurry preparation of
[0038] Step 2, preparation of coating 2 and 3 slurry:
[0039] a. mix NMP and DMP with mass ratio m(NMP):m(DMF)=1:1, thereby complete the preparation of mixed solvent one;
[0040] b. Stir the mixed solvent 1 at a speed of 500~1000rpm, and add PVDF powder at a constant speed according to the mass ratio ...
Embodiment 2
[0056] A method for preparing a positive electrode sheet, comprising the following steps:
[0057] Step 1, preparation of coating-slurry:
[0058] Weigh the positive electrode active material NCM, conductivity agent KS-15, powder cellulose acetate butyrate and cyanoethyl sucrose as binder, wherein, the mass ratio NCM: KS-15: cellulose acetate butyrate: cyanoethyl sucrose = 48:1:1:1, first dissolve cyanoethyl sucrose with deionized water, then add NCM and KS-15 respectively, and finally add cellulose acetate butyrate, when these components are completely dispersed, add deionized water, Adjust the solid content of the slurry to 50%, and finally perform vacuum degassing for 4 hours, thereby completing the preparation of the coating-slurry;
[0059] Step 2, preparation of coating 2 slurry:
[0060] a. mix DMAc and acetone with mass ratio m(DMAc):m(acetone)=1:1, thus complete the preparation of mixed solvent one;
[0061] b. Stir the mixed solvent 1 at a speed of 500~1000rpm, an...
Embodiment 3
[0067] A method for preparing a negative electrode sheet, comprising the following steps:
[0068] Step 1, preparation of coating-slurry:
[0069] Weigh the negative electrode active material silicon carbon material, conductivity agent Ketjen black, and binder powder PMMA and PVA. Among them, the mass ratio of silicon carbon material: Ketjen black: PMMA:PVA=95:1.5:1.5:1.5, first use Dissolve PVA in deionized water, then add silicon carbon material and Ketjen black respectively, and finally add PMMA, when these components are completely dispersed, add deionized water, adjust the solid content of the slurry to 45%, and finally perform vacuum degassing for 4 hours , thereby completing the preparation of the coating-slurry;
[0070] Step 2, preparation of coating 3 slurry:
[0071] (1) In an environment with a dew point less than -20°C, mix DMAc and THF at a mass ratio of m(tetrahydrofuran):m(DMAc)=1:1 to complete the preparation of mixed solvent II;
[0072] (2) Weigh LiBOB po...
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