Charging and Discharging Behavior of Solvothermal LiFePO4 Cathode Material Investigated by Combined EELS/NEXAFS Study
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- 作者：Manfred E. Schuster ; Detre Teschner ; Jelena Popovic ; Nils Ohmer ; Frank Girgsdies ; Julian Tornow ; Marc G. Willinger ; Dominik Samuelis ; Maria-Magdalena Titirici ; Joachim Maier ; Robert Schl?gl
- 刊名：Chemistry of Materials
- 出版年：2014
- 出版时间：January 28, 2014
- 年：2014
- 卷：26
- 期：2
- 页码：1040-1047
- 全文大小：490K
- ISSN：1520-5002
文摘
LiFePO4 cathode material obtained via solvothermal synthesis was investigated at several charging and discharging stages by a combination of bulk (EELS) and surface sensitive (NEXAFS) methods in order to get insight into the distribution of Li in the surface and bulk region of the particles. Different behavior was observed as a function of the particles morphology. The turbostratic stacking of layers in nanosized crystals induces higher dimensional defects responsible for sluggish Li insertion and extraction within the structure. In contrast, microstructured crystals without higher dimensional defects do not exhibit sluggish Li insertion/extraction, and achieve a higher degree of reversibility during electrochemical cycling.