Journal
JOURNAL OF POWER SOURCES
Volume 119, Issue -, Pages 604-609Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(03)00303-3
Keywords
lithium ion rechargeable batteries; lithium alloy anodes; metal anodes; amorphous phase; silicon; thermodynamics
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As lithiated-metal alloys such as Li-Si or Li-Sn are of great interest as high energy density anodes for Li-ion rechargeable batteries, a fundamental understanding on how the metals behave upon lithiation is important. X-ray diffraction and HREM experiments in this work reveal that the crystallization of equilibrium inter-metallic compounds (e.g. Li-Si) is inhibited during lithiation at room temperature, and that formation of highly lithiated glass instead occurs. This glass is shown to be metastable with respect to the equilibrium crystalline phases. We show that the mechanism of electrochemical alloying is electrochemically-driven solid-state amorphization (ESA), a process closely analogous to the diffusive solid-state amorphization (SSA) of thin films. Experimental results on the diffusive reaction of Li and Si bilayer films support the proposed mechanism. (C) 2003 Elsevier Science B.V. All rights reserved.
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