A preparation method of a multiple modified silicon-manganese alloy composite negative electrode material
A silicon-manganese alloy and negative electrode material technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of failing to meet the energy density requirements of lithium-ion batteries, failing to meet actual use requirements, and reducing battery life. Improve the first charge and discharge efficiency and cycle stability, improve cycle stability, and reduce cost
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Embodiment 1
[0026] A method for preparing a multiple-modified silicon-manganese alloy composite negative electrode material in this embodiment comprises the following steps:
[0027] (1) Put 56g of silicon powder, the average particle size of silicon powder is 11μm, 14g of manganese powder, the average particle size of manganese powder is 6μm, put them into a high-energy ball mill, add 150ml of absolute ethanol as the ball milling medium, and the ball-to-material ratio is 10:1 , with 2000r / min ball milling for 10h to obtain silicon-manganese alloy;
[0028] (2) adding 1000ml of deionized water to dilute the silicomanganese alloy and then drying and granulating it with a spray dryer, the inlet temperature of the spray drying is 300°C, and the outlet temperature is 150°C to obtain the silicomanganese alloy powder;
[0029] (3) Put the silicon-manganese alloy powder into the tube furnace, feed the mixed gas of argon and oxygen, wherein the mass fraction of argon is 95%, and the mass fraction...
Embodiment 14
[0035] A method for preparing a multiple-modified silicon-manganese alloy composite negative electrode material in this embodiment comprises the following steps:
[0036] (1) Put 42g of silicon powder with an average particle size of 8μm, 14g of manganese powder with an average particle size of 4μm into a high-energy ball mill, add 122ml of absolute ethanol as a ball milling medium, and the ball-to-material ratio is 10:1 , with 2000r / min ball milling for 10h to obtain silicon-manganese alloy;
[0037] (2) adding 1000ml of deionized water to dilute the silicomanganese alloy and then drying and granulating it with a spray dryer, the inlet temperature of the spray drying is 280°C, and the outlet temperature is 130°C to obtain the silicomanganese alloy powder;
[0038] (3) Put the silicon-manganese alloy powder into the tube furnace, feed the mixed gas of argon and oxygen, wherein the mass fraction of argon is 94.5%, and the mass fraction of oxygen is 5.5%, with a heating rate of ...
Embodiment 15
[0041] A method for preparing a multiple-modified silicon-manganese alloy composite negative electrode material in this embodiment comprises the following steps:
[0042] (1) Put 70g of silicon powder, the average particle size of silicon powder is 14 μm, 14g of manganese powder, the average particle size of manganese powder is 8 μm, put them into the high-energy ball mill, add 178.5ml of absolute ethanol as the ball milling medium, and the ball-to-material ratio is 10: 1. Ball mill at 2000r / min for 10h to obtain silicon-manganese alloy;
[0043] (2) adding 1000ml of deionized water to dilute the silicomanganese alloy and then drying and granulating it with a spray dryer, the inlet temperature of the spray drying is 320°C, and the outlet temperature is 170°C to obtain the silicomanganese alloy powder;
[0044] (3) Put the silicon-manganese alloy powder into the tube furnace, feed the mixed gas of argon and oxygen, wherein the mass of argon is 95.45%, the mass of oxygen is 4.55...
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