Method for preparing hard carbon negative electrode materials of lithium ion battery
A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unfavorable full utilization of raw materials and production costs, unfavorable control of product batch consistency, and long stabilization heat treatment time. , to reduce the generation of volatile tar by-products, improve batch consistency, and stabilize process optimization.
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Embodiment 1
[0046] A preparation method of a hard carbon negative electrode material for a lithium ion battery, comprising the following process steps:
[0047] A, select one or several in arbitrary proportions in sulfuric acid, vitriol, boric acid, borate, phosphoric acid, phosphate, hydrochloric acid, hydrochloride, ammonia or ammonium salt as catalyst, be mixed with catalyst solution;
[0048] B, take starch and catalyst solution according to the mass ratio of solute in starch and catalyst solution as 1:1, mix the two, stir;
[0049] C, the solvent is removed, and the obtained solid is dried in a drying oven to obtain the starch powder impregnated with the catalyst;
[0050] The solvent removal mentioned above is the method of using centrifugation, filtration, suction filtration or evaporation.
[0051] D. Add the starch powder impregnated with the catalyst into the heating furnace, raise the temperature to 80°C at a rate of 0.1°C / min under an inert atmosphere, heat for 0.5 hours, and...
Embodiment 2
[0054] A preparation method of a hard carbon negative electrode material for a lithium ion battery, comprising the following process steps:
[0055] A, select one or several in arbitrary proportions in sulfuric acid, vitriol, boric acid, borate, phosphoric acid, phosphate, hydrochloric acid, hydrochloride, ammonia or ammonium salt as catalyst, be mixed with catalyst solution;
[0056] B, according to the mass ratio of solute in the starch and the catalyst solution is 100:1 to take the starch and the catalyst solution, mix the two, stir;
[0057] C, the solvent is removed, and the obtained solid is dried in a drying oven to obtain the starch powder impregnated with the catalyst;
[0058] The solvent removal mentioned above is the method of using centrifugation, filtration, suction filtration or evaporation.
[0059] D. Add the starch powder impregnated with the catalyst into the heating furnace, raise the temperature to 180°C at a rate of 10°C / min under an inert atmosphere, he...
Embodiment 3
[0062] A preparation method of a hard carbon negative electrode material for a lithium ion battery, comprising the following process steps:
[0063] A, select one or several in arbitrary proportions in sulfuric acid, vitriol, boric acid, borate, phosphoric acid, phosphate, hydrochloric acid, hydrochloride, ammonia or ammonium salt as catalyst, be mixed with catalyst solution;
[0064] B, take starch and catalyst solution according to the mass ratio of solute in starch and catalyst solution as 50:1, mix the two, stir;
[0065] C, the solvent is removed, and the obtained solid is dried in a drying oven to obtain the starch powder impregnated with the catalyst;
[0066] The solvent removal mentioned above is the method of using centrifugation, filtration, suction filtration or evaporation.
[0067] D. Add the starch powder impregnated with the catalyst into the heating furnace, raise the temperature to 130°C at a rate of 5°C / min under an inert atmosphere, heat for 2.25 hours, an...
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