A kind of preparation method of layered silicon carbon material for negative electrode of battery
A technology of silicon carbon materials and battery negative electrodes, which is applied in the direction of battery electrodes, secondary battery manufacturing, negative electrodes, etc., can solve the problems of not exerting the silicon negative electrode gram capacity, difficult compaction, and reduced compaction density
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[0037] The invention provides a method for preparing a layered silicon-carbon material for a negative electrode of a battery, comprising the following steps:
[0038] Step 1 Weighing raw materials
[0039] The various raw materials are weighed according to the following weight ratio, the weight ratio of silicon powder, montmorillonite and dispersant is 1.7-2.2:4.5-5.5:3-3.6.
[0040] The dispersant in the present invention is hydroxymethyl cellulose CMC, contains carbon chain and oxygen in CMC, and carbon chain can stretch out in water, forms conductive network, and silicon and carbon are embedded in the conductive network; Oxygen can combine with silicon, form Silicon oxide improves the recyclability of silicon carbon materials; the dispersant in the present invention can also be carboxymethyl cellulose, polyvinyl alcohol, polymaleic anhydride, polyethylene glycol, glycosides, starch acetate, etc.
[0041] In the present invention, the particle size of silicon powder is 0.8-...
Embodiment 1
[0060] Step 1 Weigh raw materials
[0061] Weigh the various raw materials according to the following weight ratio, the weight ratio of silicon powder, montmorillonite, and dispersant is 1.8:4.7:3.
[0062] Step 2 Prepare the dispersion
[0063] Add hydroxymethylcellulose CMC to deionized water to prepare CMC dispersion.
[0064] Step 3 Prepare slurry
[0065] Take the montmorillonite and silica fume weighed in step 1 and mix 50%, which is recorded as mixture 1;
[0066] Take the montmorillonite and silica fume weighed in step 1 and mix them by 30%, which is recorded as mixture 2;
[0067] Take the remaining 20% of the montmorillonite and silicon powder weighed in step 1 and mix, and record it as mixture 3;
[0068] Add mixture 1 to the CMC dispersion and stir for 23 minutes; then add mixture 2 and stir for 30 minutes; then add mixture 3 and stir for 55 minutes to obtain a uniform slurry.
[0069] Step 4 Preparation of silicon carbon material
[0070] The slurry was dr...
Embodiment 2
[0072] Step 1 Weigh raw materials
[0073] Weigh each raw material according to the following weight ratio, the weight ratio of silicon powder, montmorillonite, and dispersant is 2:5:3.2.
[0074] Step 2 Prepare the dispersion
[0075] Add hydroxymethylcellulose CMC to deionized water to prepare CMC dispersion.
[0076] Step 3 Prepare slurry
[0077] Take the montmorillonite and silica fume weighed in step 1 and mix 50%, which is recorded as mixture 1;
[0078] Take the montmorillonite and silica fume weighed in step 1 and mix them by 30%, which is recorded as mixture 2;
[0079] Take the remaining 20% of the montmorillonite and silicon powder weighed in step 1 and mix, and record it as mixture 3;
[0080] Add Mixture 1 to the CMC dispersion, and stir for 30 minutes; then add Mixture 2, and stir for 42 minutes; then add Mixture 3, and stir for 59 minutes to obtain a uniform slurry.
[0081] Step 4 Preparation of silicon carbon material
[0082] The slurry was dried at ...
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