Method for preparing silicon nanoparticles, anode material containing silicon nanoparticles, and lithium ion battery
A nano-silicon and particle technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as increased cost, inability to significantly improve performance, and inability to directly apply lithium-ion batteries to improve specific capacity and cycle performance. Effect
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Examples
Embodiment 1
[0031] according to figure 1 The preparation flow chart shown is for the preparation of nano-silicon particles. Under the protection of nitrogen, 8.8g of silicon monoxide SiO was heated at 800°C for 24 hours to carry out disproportionation reaction. After natural cooling, 8.8g of brown granular products were obtained. The obtained granular products were coated with silicon dioxide and contained multiple Coating of nano-silicon particles. The resulting product was stirred and treated for 1 hour with 20 g of 40 wt % hydrofluoric acid (the molar ratio of silicon dioxide and hydrofluoric acid was 1:4), and the coating SiO outside the nano-silicon particles was 2 Corroded away (i.e. cladding SiO 2 dissolved by hydrofluoric acid). After centrifugation, the nano-silicon particles in the lower sediment were washed with water three times, centrifuged after each wash, the upper layer was removed, and the sediment was dried to obtain 3.9 g of brown nano-silicon particles with a partic...
Embodiment 2
[0036] Under the protection of nitrogen, 8.8g of silicon monoxide was heated at 950°C for 12 hours to carry out disproportionation reaction, and 8.8g of tan product was obtained after natural cooling. The resulting product was stirred for 2 hours with 60g of 20wt% hydrofluoric acid (the molar ratio of silicon dioxide and hydrofluoric acid was 1:6), and the coating SiO outside the nano-silicon particles was 2 After being corroded, the sediment in the lower layer was washed with water three times after centrifugation, and was separated by centrifugation after each washing, and the upper layer was removed, and the sediment was dried to obtain 3.3 g of brown nano-silicon particles with a particle size of 5 nm.
[0037] The obtained nano-silicon particles were mixed with graphite KS6, conductive agent Super P and binder PVDF according to the mass ratio of 60:25:10:5 (0.18g, 0.075g, 0.03g, 0.015g respectively), and 1mL N-formazol was added NMP was ground into a slurry and evenly coa...
Embodiment 3
[0041] Under the protection of argon, 8.8g of silicon monoxide was heated at 1000°C for 10 hours to carry out disproportionation reaction, and 8.8g of tan product was obtained after natural cooling. The resulting product was stirred for 2 hours with 60g of 20wt% hydrofluoric acid (the molar ratio of silicon dioxide and hydrofluoric acid was 1:6), and the coating SiO outside the nano-silicon particles was 2 After being corroded, the sediment in the lower layer was washed with water three times after centrifugation, and was centrifuged after each washing, and the upper layer was removed, and the sediment was dried to obtain 3.1 g of brown nano-silicon particles with a particle size of 40 nm.
[0042] The obtained nano-silicon particles were mixed with graphite KS6, conductive agent Super P and binder CMC (hydroxymethyl cellulose) according to the mass ratio of 20:60:10:10 (0.06g, 0.18g, 0.03g, 0.03g respectively ), added 1mL of N-methylpyrrolidone (NMP) and ground it into a slur...
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Abstract
Description
Claims
Application Information
- IPC
- C01B33/027; H01M4/38
- CPC
- Y02E60/12; Y02E60/10
- Inventors
- 曾绍忠; 朱广燕