Method of fabricating structured particles composed of silicon or silicon-based material and their use in lithium rechargeable batteries
US8772174B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2011 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Apr 8, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for treating silicon to form pillars, especially for use as the active anode material in Li-ion batteries, is disclosed. The process is simple to operate on a commercial scale since it uses a solution containing only a small number of ingredients whose concentration needs to be controlled and it can be cheaper to operate than previous processes. The solution includes: 0.01 to 5M HF 0.002 to 0.2M of metal ions capable of nucleating on and forming a porous layer comprising regions of elemental metal on the silicon surface; 0.001 to 0.7M of an oxidant selected from the group O2, O3, H2O2, the acid, ammonium or alkali metal salt of NO3−, S2O82−, NO2−, B4O72− and ClO4− or a mixture thereof. The treated silicon is suitably removed from the solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.