期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 10, 期 2, 页码 335-339出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.12.024
关键词
LiFePO4; structural transformation; synchrotron X-ray diffraction; Li-ion secondary battery; cathode
Structural transformation taking place during charge/discharge of the LiFePO4 electrode in an organic Li-ion electrolyte has been studied by in situ synchrotron X-ray diffraction (XRD) concurrently with electrochemical analysis. The data reveal complex structural transformation patterns which result from significantly delayed structural transformation, even at low to moderate current rates (C/10 similar to 1 C). The extent of the deviation is affected by charge/discharge conditions as well as history, and strong deviation appears detrimental to electrode cycle life. Furthermore, the two-phase characteristic of the Li+ insertion/extraction reactions is found to persist even within one metastable crystal structure. The result suggests the presence of domain structures that are probably caused by the strong electron/ion site coulombic interaction as previously suggested. (c) 2007 Elsevier B.V. All rights reserved.
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