A kind of nano-silicon composite anode material for lithium ion battery and preparation method thereof
A technology of lithium ion battery and composite anode, which is applied in the field of nano-silicon composite anode material with high primary efficiency and its preparation, can solve the problems of high alkali metal danger, damage of matrix material, and many irregular active sites on particle surface, etc. Achieve the effect of being conducive to industrialized large-scale production, maintaining the original structure, and having a good original structure
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Embodiment 1
[0026] A preparation method for a nano-silicon composite anode material for a lithium-ion battery, the steps are as follows:
[0027] B1. Heating the elemental magnesium metal to 300°C under vacuum to sublimate it, and the sublimated metal vapor diffuses into the rotating reactor;
[0028] B2. Add commercial silicon oxide powder into the reactor, keep the reactor speed at 1.5rpm / min, keep the reactor temperature at 480°C, and then feed steam into the reactor to generate gas-solid reaction.
[0029] B3. After reacting for 3 hours, stop the supply of doping steam, introduce argon gas to make the pressure in the reactor reach 1 atm, mix methane gas and argon gas at a volume fraction of 1:1, and then pass it into the reactor, and react at 1000°C for 4 Hour;
[0030] B4. After heat treatment and coating, switch to pure argon atmosphere, cool to room temperature at a cooling rate of 20°C / min, depolymerize and sieve to obtain nano-silicon composite anode material. The nano-silicon ...
Embodiment 2
[0032] A preparation method for a nano-silicon composite anode material for a lithium-ion battery, the steps are as follows:
[0033] B1. Heat the passivated lithium element to 200°C under vacuum, so that the sublimated metal vapor diffuses into the rotating reactor;
[0034] B2. Add commercial silicon oxide powder into the reactor, keep the reactor speed at 3rpm / min, keep the reactor temperature at 350°C, and then let steam flow into the reactor to generate gas-solid reaction.
[0035] B3. After 3 hours of reaction, stop the supply of doping steam, introduce argon gas to make the pressure in the reactor reach 1atm, mix acetylene gas and argon gas at a volume fraction of 1.2:1, and then pass it into the reaction chamber of the reactor, at 1000°C Reaction for 4 hours;
[0036] B4. After heat treatment and coating, switch to pure argon atmosphere, cool to room temperature at a cooling rate of 5°C / min, depolymerize and sieve to obtain a powder product.
Embodiment 3
[0038] A preparation method for a nano-silicon composite anode material for a lithium-ion battery, the steps are as follows:
[0039] B1. Heat the passivated lithium element to 200°C under vacuum, so that the sublimated metal vapor can diffuse to the rotating reactor;
[0040] B2. Load commercial nano-silicon-carbon composite powder into the reaction, keep the reactor speed at 3rpm / min, and keep the reactor temperature at 350°C, and then allow steam to flow into the reactor for gas-solid reaction.
[0041] B3. After reacting for 3 hours, stop the supply of doping steam, introduce argon gas to make the pressure in the reactor reach 1atm, mix benzene gas and argon gas at a volume fraction of 1:1.45, and then pass it into the reaction chamber, and react at 1000°C for 4 hours;
[0042] B4. After heat treatment and coating, switch to pure argon atmosphere, cool to room temperature at a cooling rate of 5°C / min, depolymerize and sieve to obtain a powder product.
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