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Structural Changes in Silicon Anodes during Lithium Insertion/Extraction
Abstract
The structural changes in silicon electrochemically lithiated and delithiated at room temperature were studied by X-ray powder diffraction. Crystalline silicon becomes amorphous during lithium insertion, confirming previous studies. Highly lithiated amorphous silicon suddenly crystallizes at 50 mV to form a new lithium-silicon phase, identified as This phase is the fully lithiated phase for silicon at room temperature, not as is widely believed. Delithiation of the phase results in the formation of amorphous silicon. Cycling silicon anodes above 50 mV avoids the formation of crystallized phases completely and results in better cycling performance. © 2004 The Electrochemical Society. All rights reserved.
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Metadata
- Authors
- Obrovac, M. N., & Christensen, L.
- Venue
- Electrochemical and Solid-State Letters
- Publisher
- The Electrochemical Society
- Published
- 2004
- Volume
- 7
- Issue
- 5
- Pages
- A93
- ISSN
- 1099-0062 (ISSN-L)
- OpenAlex
- W2147786599
- Cited by
- 1,995
- References
- 0
- FWCI
- 20.60
- Type
- journal article
- Language
- en
- Open access
- closed
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