Method of preparing silicon oxide negative electrode material for lithium ion battery
A lithium-ion battery and silicon oxide technology, which is applied in the field of lithium-ion batteries, can solve the problems of high preparation cost of high-purity silicon oxide, high price of high-purity silicon powder and high-purity silicon dioxide powder, and achieves obvious price advantages and high production capacity. The effect of high rate and simplified process steps
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Embodiment 1
[0035] A method for preparing a silicon oxide negative electrode material for a lithium ion battery, comprising the steps of:
[0036] In the first step, 100g of micron-sized silicon powder (the average particle size is controlled between 1 and 5 μm) is subjected to high-temperature treatment at 550°C for 300 minutes in an oxygen atmosphere to form a 20nm-thick silicon dioxide layer on the surface;
[0037] In the second step, continue to heat up to 1300°C and keep it in a vacuum state for 5 hours, with a vacuum degree of 500 Pa, to make the silicon material coated with a silicon dioxide layer obtained in the first step react to generate silicon oxide gas, which is finally condensed into The silicon oxide block is crushed by a planetary ball mill to obtain 98.7g of 2.0-5.0μm silicon oxide powder. The silicon oxide powder contains a certain amount of nano-silicon crystal grains. figure 2 It can be seen from the X-ray diffraction pattern that the diffraction peaks at 28.6, 47.5...
Embodiment 2
[0039] In the first step, 100g of sub-micron silicon powder (average particle size is controlled between 100nm and 500nm) is subjected to high-temperature treatment at 600°C for 60 minutes in an oxygen atmosphere to form a silicon dioxide layer with a thickness of 5nm on the surface;
[0040] In the second step, continue to heat up to 1300°C and keep it in a vacuum state for 12 hours, the vacuum degree is 1500pa, so that the silicon material obtained in the first step reacts to generate silicon oxide gas, and finally condenses into silicon oxide blocks, and the planetary ball mill is crushed to obtain 3.0 96.4g of ~4.0μm silicon oxide powder.
Embodiment 3
[0042] In the first step, 100g of submicron silicon powder (average particle size controlled between 500nm and 1μm) is subjected to high temperature treatment at 700°C for 500min in an oxygen atmosphere to form a silicon dioxide layer with a thickness of 40nm on the surface ;
[0043] In the second step, continue to heat up to 1450°C and keep it in a vacuum state for 8 hours, the vacuum degree is 1000pa, so that the silicon material obtained in the first step reacts to generate silicon oxide gas, and finally condenses into a silicon oxide block, which is crushed by a planetary ball mill to obtain 10.0 ~15.0μm silicon oxide powder 99.1g.
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