Silicon-based si-c negative electrode material prepared based on silicon-based oxide and its preparation method and application
A technology of silicon-based oxides and negative electrode materials, applied in the direction of negative electrodes, carbon compounds, active material electrodes, etc., can solve the problems of uneven distribution of silicon and carbon, easy agglomeration of silicon particles, and high production costs, so as to improve electrochemical performance, Moderate silicon particle size, the effect of improving electrical conductivity
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Embodiment 1
[0046] A method for preparing a silicon-based Si-C negative electrode material prepared based on a silicon-based oxide is carried out in the following steps;
[0047] (1) Place calcium chloride and sodium chloride salts in a vacuum oven at 300°C for 12 hours to remove water.
[0048] (2) Under argon protection, weigh 2.5±0.1g of calcium silicate, 2.8±0.1g of calcium carbide, 88.8±0.1g of calcium chloride, 44.4±0.1g of sodium chloride in a ceramic mortar Grind, mix, put into a ziplock bag and seal.
[0049](3) Pour the mixed salt into the nickel crucible embedded in the reactor, and seal it;
[0050] (4) Argon gas is introduced from the reactor inlet, and argon gas is discharged from the reactor gas outlet to ensure positive pressure in the reactor, and the resistance wire furnace is heated at a rate of 5° C. / min.
[0051] (5) Raise the temperature to 590°C and keep the temperature constant for 5 hours to melt the molten salt and promote the reaction. Raise the temperature o...
Embodiment 2
[0062] A method for preparing a silicon-based Si-C negative electrode material prepared based on a silicon-based oxide is the same as in Example 1, except that:
[0063] (1) In step (1), the molten salt is replaced with 88.8g calcium chloride, 178.8g potassium chloride;
[0064] (2) In step (5), the synthesis temperature is 650°C;
[0065] Other methods are the same.
[0066] Prepare silicon-based Si-C negative electrode materials based on silicon-based oxides with a particle size of 15 to 45 microns, and use the prepared silicon-based Si-C negative electrode materials based on silicon-based oxides as negative electrode materials for lithium-ion batteries , the lithium-ion battery prepared by the method of Application Example 1 has a specific discharge capacity of 2987.5mAh·g for the first time -1 , Coulombic efficiency is 79%, at 0.2A·g -1 After 400 cycles of current density, the reversible cycle specific capacity of the battery is 1385.6mAh g -1 , the Coulombic efficienc...
Embodiment 3
[0068] A method for preparing a silicon-based Si-C negative electrode material prepared based on a silicon-based oxide is the same as in Example 1, except that:
[0069] (1) In step (1), the molten salt is replaced with 88.8g calcium chloride, 178.8g potassium chloride, 44.4g sodium chloride;
[0070] (2) In step (5), the synthesis temperature is 630°C;
[0071] Other methods are the same.
[0072] Prepare silicon-based Si-C negative electrode materials based on silicon-based oxides with a particle size of 10-30 microns, and use the prepared silicon-based Si-C negative electrode materials based on silicon-based oxides as negative electrode materials for lithium-ion batteries , the first discharge specific capacity of the lithium-ion battery prepared by the method of Application Example 1 is 2790.5mAh g -1 , Coulombic efficiency is 80.5%, at 0.2A g -1 After 400 cycles of current density, the reversible cycle specific capacity of the battery is 1302.8mAh g -1 , the Coulombic...
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