Invention Grant
- Patent Title: Stabilized, prelithiated silicon oxide particles for lithium ion battery anodes
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Application No.: US17480010Application Date: 2021-09-20
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Publication No.: US11784307B2Publication Date: 2023-10-10
- Inventor: Kai Yan , Hongduan Huang
- Applicant: Amprius Technologies, Inc.
- Applicant Address: US CA Fremont
- Assignee: Amprius Technologies, Inc.
- Current Assignee: Amprius Technologies, Inc.
- Current Assignee Address: US CA Fremont
- Agency: Weaver Austin Villeneuve & Sampson LLP
- The original application number of the division: US16250635 2019.01.17
- Main IPC: H01M4/485
- IPC: H01M4/485 ; H01M4/134 ; H01M4/36 ; H01M4/131 ; H01M4/133 ; H01M4/1395 ; H01M4/38 ; H01M4/1391 ; H01M10/0525 ; H01M4/1393 ; H01M4/04 ; H01M4/587 ; H01M4/62 ; H01M4/58 ; H01M4/02

Abstract:
Although silicon-oxide based particles have stable capacity and high cycling efficiency as anode active material, they are known to suffer significant capacity loss during the first battery cycles. The addition of lithium silicate may help to mitigate the initial capacity loss, but it has been difficult to produce such anodes. During battery manufacture cell components are exposed to water, and lithium silicate is water soluble. As lithium silicate dissolves, the pH of the water increases, which can etch silicon, degrading the anode active material. Such degradation can be mitigated by doping lithium silicate with multivalent elements or by converting some silicon to metal silicide before water processing. Doping of lithium silicate makes it less soluble in water. And metal silicide is not as easily etched as silicon. While retaining the excellent capacity and stability of silicon-oxide based material, these methods and the structures they produce have been shown to increase the effective energy density of batteries that employ such structures by offsetting capacity loss in the first cycles.
Public/Granted literature
- US20220006079A1 STABILIZED, PRELITHIATED SILICON OXIDE PARTICLES FOR LITHIUM ION BATTERY ANODES Public/Granted day:2022-01-06
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