Negative electrode material for nonaqueous electrolyte secondary battery, making method and lithium ion secondary battery
A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of low charging/discharging efficiency in the first cycle, and achieve high-cycle charging/discharging Efficiency, Ease of Method, Simple Method Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0051] In an argon flow, 100 g of particles with an average particle size of 5 μm and a BET specific surface area of 3.5 m 2 / g of SiOx (x=1.01) particles were heat-treated at 1000°C for 3 hours. When observed under a transmission electron microscope (TEM), the heat-treated particles were found to have a structure in which silicon nanoparticles were dispersed in silicon oxide.
[0052] At room temperature, the heat-treated powder was filled into a 2-liter plastic bottle, where it was wetted with 30 mL of methanol, after which 200 mL of deionized water was added. After the entire powder was infiltrated to contact with deionized water, 5 mL of 50% by weight aqueous hydrofluoric acid was added slowly and stirred. The resulting mixture had a hydrofluoric acid concentration of 1.1% by weight or contained 2.5 g of hydrogen fluoride per 100 g of heat-treated powder. The mixture was kept at room temperature for 1 hour for etching.
[0053] After the etching process, rinse with de...
Embodiment 2
[0061] As in Example 1, the same heat-treated particles as in Example 1 were subjected to etching treatment except that the amount of a 50% by weight hydrofluoric acid aqueous solution was changed from 5 mL to 57.5 mL (the resulting mixture had 10% by weight of hydrogen Fluoric acid concentration or relative to 100g heat-treated powder contains 28.75g hydrogen fluoride). 90.6 g of black particles were recovered. The black particles had an oxygen concentration of 29.4% by weight before carbon coating, indicating an oxygen / silicon molar ratio of 0.73. The black particles (after carbon coating) have an average particle size of 5.1 μm and 18.8 m 2 / g of the BET specific surface area and is conductive because the carbon coverage is 4.9% by weight based on the black particles. When observed under TEM, the black particles were found to have a structure in which silicon nanoparticles were dispersed in silicon oxide and had a size of 5 nm.
[0062] As in Example 1, negative electrod...
Embodiment 3
[0064] At room temperature, 100 g of heat-treated powder as in Example 1 were charged into a stainless steel chamber. Hydrofluoric acid gas diluted to 30% by volume with nitrogen was passed through the chamber for 1 hour. After the flow of hydrofluoric acid was interrupted, the chamber was purged with nitrogen until the HF concentration in the exhaust gas as monitored by the FT-IR monitor decreased to less than 5 ppm. Subsequently, the pellets were taken out, the pellets had a weight of 94.5 g and an oxygen concentration of 33.4% by weight, indicating an oxygen / silicon molar ratio of 0.88.
[0065] The particles were coated with carbon as in Example 1 and 105.5 g of black particles were recovered. The black particles have an average particle size of 5.3 μm, 6.3m 2 / g of the BET specific surface area, and the carbon coverage based on the black particles was 5.2% by weight. When observed under TEM, the black particles were found to have a structure in which silicon nanopartic...
PUM
Property | Measurement | Unit |
---|---|---|
size | aaaaa | aaaaa |
particle size | aaaaa | aaaaa |
specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com