Lithium ion battery silicon-carbon composite negative electrode material and preparation method thereof
A lithium-ion battery, silicon-carbon composite technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as high cost and complicated preparation process
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Embodiment 1
[0038] Take 325-mesh natural zeolite powder, add dilute nitric acid with a concentration of 1.5mol / L to repeatedly wash and suction filter 4 times, then wash with water until neutral and dry; take the dried zeolite powder and mix it with aluminum powder, the aluminum in the aluminum powder and SiO in zeolite powder 2 The molar ratio of zeolite powder and aluminum powder is 1.17, and the mixture of zeolite powder and aluminum powder is placed in a tube furnace and calcined at a high temperature of 700 ° C for 2 hours, so that the aluminum powder can fully reduce the silica in the zeolite powder;
[0039] Wash the calcined product with dilute nitric acid with a concentration of 1.5mol / L to remove the Al produced by the reaction 2 o 3 and other impurities, then repeatedly washed with water and dried; then treated with ethanol solution for 2 hours, washed with water twice, the purpose is to dissolve the aluminum nitrate generated in the material; then mixed with 3mol / L hydrofluor...
Embodiment 2
[0043] Example 2: Porous silicon material was prepared by the same method as in Example 1.
[0044] Weigh 1000g of porous silicon powder and 640g of carbon powder, stir and mix thoroughly for 40 minutes, then add 360g of coal tar pitch micropowder, fully stir and mix at room temperature for 60 minutes, then put it into the sintering furnace, slowly raise the temperature to 1100°C for sintering, and then carry out sintering after cooling. Pulverize to obtain the first mixture; fully mix 2000g of natural graphite and 3000g of artificial graphite, and then add 550 g of lithium silicide and mix to obtain the second mixture.
[0045] Weigh the first mixed material 1200g and the second mixed material 2800g respectively, after fully mixing at room temperature for 1 hour, after mixing 70% of the first mixed material and 70% of the second mixed material, carry out the first ball milling process, the first mixed material The total weight of the second mixture and the solid-liquid ratio ...
Embodiment 3
[0047] Example 3: Porous silicon material was prepared by the same method as in Example 1.
[0048] Weigh 1000g of silicon powder and 600g of carbon powder, fully stir and mix for 40 minutes, then add 400g of asphalt, fully stir and mix at room temperature for 40 minutes, then put it into a sintering furnace, slowly raise the temperature to 1200°C for sintering, and pulverize after cooling to obtain the first 1. Mixed material: fully mix 1500g of natural graphite, 3000g of artificial graphite powder, and 500g of graphene, then add 550g of lithium silicide and mix to obtain the second mixed material.
[0049] Weigh 1600g of the first mixture and 2400g of the second mixture, mix the two raw materials at room temperature for 1 hour, then mix 70% of the first mixture and 70% of the second mixture for the first time Ball milling treatment, the total weight of the first mixture and the second mixture and the solid-liquid ratio of ethanol are 1:4, the ball milling speed is 260r / min, ...
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