Delithiation Study of LiFePO4 Crystals Using Electron Energy-Loss Spectroscopy

被引:47
作者
Sigle, Wilfried [1 ]
Amin, Ruhul [2 ]
Weichert, Katja [2 ]
van Aken, Peter A. [1 ]
Maier, Joachim [2 ]
机构
[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
[2] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany
关键词
conduction bands; electrochemical electrodes; electron energy loss spectra; iron compounds; lithium compounds; powders; secondary cells; valence bands; EDGE FINE-STRUCTURES; SINGLE-CRYSTALS; MISCIBILITY GAP; TRANSPORT; OLIVINE; MICROSCOPY; MINERALS; LIXFEPO4; FE; NANOPARTICLES;
D O I
10.1149/1.3131726
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
There is still some controversy about the mechanisms responsible for the delithiation of LiFePO4. We studied the delithiation of both large single crystals and powder by electron energy-loss spectroscopy. It is shown that Li depletion leads to a change in the Fe valency, to an enhanced prepeak at the O K edge, and to a pronounced interband transition peak between 4 and 6 eV. Exploiting these spectral changes, the delithiation process was monitored, with the result that in the large single crystal, delithiation takes place by removal of Li from the surface-near region, whereas in small particles, Li is removed from the particle core.
引用
收藏
页码:A151 / A154
页数:4
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