Silicon-carbon negative electrode material for lithium ion battery and preparation method of silicon-carbon negative electrode material
A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as loss of active materials, sharp drop in battery capacity, collapse of material structures, etc., to achieve Reduce the absolute volume expansion, increase the conductivity, reduce the effect of polarization
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Embodiment 1
[0043] A method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, comprising the steps of:
[0044](1) Preparation of nano-silicon slurry: 1000 g of polycrystalline silicon powder with a median particle size of 2 μm is added to methanol, the solid content of the mixed solution is 10%, and the mixed solution is introduced into a sand mill, wherein the grinding beads are zirconia balls , the mass ratio of ball milling beads to silicon powder raw materials is 30:1, and the grinding time is 40h to obtain the desired nano-silicon slurry; the nano-silicon slurry is detected by a Mastersizer3000 particle size analyzer, and the median particle size of nano-silicon is 78nm ; The nano-silicon is analyzed by X-ray diffraction pattern, and the grain size of the nano-silicon is 7.1nm;
[0045] (2) Liquid phase compounding: adding the carbon nanotube slurry with a solid content of 0.2% to the nano-silicon slurry in step (1), wherein the mass ratio of nano...
Embodiment 2
[0049] (1) Preparation of nano-silicon slurry: the median particle size is 30 μm polysilicon powder 1000g is added in ethanol, the solid content of the mixed solution is 15%, the mixed solution is imported in the sand mill, wherein the grinding beads are stainless steel, grind The time is 50h, the mass ratio of the ball milling beads and the silicon powder raw material is 20:1, and the required nano-silicon slurry is obtained; the nano-silicon slurry is detected by a Mastersizer3000 particle size analyzer, and the median diameter of the nano-silicon is 85nm; Nano-silicon is analyzed by X-ray diffraction pattern, and the grain size of nano-silicon is 7.8nm;
[0050] (2) Liquid phase compounding: adding the carbon nanotube slurry with a solid content of 0.6% to the nano-silicon slurry in step (1), wherein the mass ratio of nano-silicon to carbon nanotubes is 95:5, and the ultrasonic wave is turned on for the mixed solution Vibrate, the frequency of the ultrasonic wave is 28000Hz...
Embodiment 3
[0054] (1) Preparation of nano-silicon slurry: 1000 g of polysilicon powder with a median particle size of 60 μm is added to isopropanol, the solid content of the mixed solution is 25%, and the mixed solution is introduced into a sand mill, wherein the grinding beads are oxidized Aluminum, grinding time is 60h, and the mass ratio of ball milling beads and silicon powder raw material is 15:1, obtains required nano-silicon slurry; This nano-silicon slurry is detected by Mastersizer3000 particle size analyzer, and the median diameter of nano-silicon is 89nm. The nano-silicon is analyzed by X-ray diffraction pattern, and the grain size of the nano-silicon is 8.3nm;
[0055] (2) Liquid phase compounding: adding the carbon nanotube slurry with a solid content of 4% to the nano-silicon slurry in step (1), wherein the mass ratio of nano-silicon to carbon nanotubes is 98:2, and the ultrasonic wave is turned on for the mixed solution Vibrate, the frequency of ultrasonic waves is 25000H...
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