Method for preparing lithium ion battery anode material by diamond wire cutting silicon waste
A diamond wire cutting and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of affecting electrochemical performance, electrode materials are easy to pulverize, and easy to separate from the current collector, so as to improve the first Coulombic efficiency and electrical conductivity, excellent electrochemical performance, and the effect of improving cycle performance
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Embodiment 1
[0026] Embodiment 1: a kind of method that diamond wire cuts silicon waste material and prepares lithium-ion battery negative electrode material, concrete steps are as follows:
[0027] (1) Put the diamond wire cutting silicon waste at a temperature of 60°C and dry it under vacuum conditions, cool it naturally, crush and grind it to obtain waste silicon powder; at a temperature of 25°C, soak the silicon powder in HF solution for 60 minutes, Use deionized water to wash to neutrality, and separate solid and liquid to obtain silicon powder; wherein the mass concentration of HF solution is 30%; the liquid-solid ratio mL:g of HF solution to silicon powder is 8:1;
[0028] (2) In a protective gas (argon) atmosphere, heat the silicon powder in step (1) to a temperature of 600°C at a constant rate, heat treat at a constant temperature for 2 hours, and then cool down with the furnace to obtain heat-treated silicon powder; the flow rate of the protective gas (argon) is 30mL / min; the rat...
Embodiment 2
[0032] Embodiment 2: a kind of method that diamond wire cuts silicon waste material and prepares lithium-ion battery negative electrode material, concrete steps are as follows:
[0033] (1) Put the diamond wire cutting silicon waste at a temperature of 80°C and dry it under vacuum conditions, cool it naturally, crush and grind it to obtain waste silicon powder; at a temperature of 40°C, soak the silicon powder in HF solution for 30 minutes, Use deionized water to wash to neutral, solid-liquid separation to obtain silicon powder; wherein the mass concentration of HF solution is 10%; the liquid-solid ratio mL:g of HF solution to silicon powder is 10:1;
[0034] (2) In a protective gas (argon) atmosphere, heat the silicon powder in step (1) to a temperature of 500°C at a constant speed, heat treat it at a constant temperature for 30 hours, and then cool it with the furnace to obtain heat-treated silicon powder; the flow rate of the protective gas (argon) is 500mL / min; the rate of...
Embodiment 3
[0038] Embodiment 3: a kind of method that diamond wire cuts silicon waste material and prepares lithium-ion battery negative electrode material, concrete steps are as follows:
[0039] (1) Dry the diamond wire cut silicon waste at a temperature of 100°C under vacuum conditions, cool naturally and crush and grind to obtain waste silicon powder; at a temperature of 40°C, soak the silicon powder in HF solution for 60 minutes, Use deionized water to wash to neutral, solid-liquid separation to obtain silicon powder; wherein the mass concentration of HF solution is 10%; the liquid-solid ratio mL:g of HF solution to silicon powder is 10:1;
[0040] (2) In a protective gas (argon) atmosphere, heat the silicon powder in step (1) to a temperature of 800°C at a constant rate, heat treat it at a constant temperature for 8 hours, and then cool it with the furnace to obtain heat-treated silicon powder; the flow rate of the protective gas (argon) is 100mL / min; the rate of uniform heating is...
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