Observation of Microstructural Evolution in Li Battery Cathode Oxide Particles by In Situ Electron Microscopy

被引:373
作者
Miller, Dean J. [1 ,2 ]
Proff, Christian [1 ,2 ]
Wen, J. G. [1 ,2 ]
Abraham, Daniel P. [3 ]
Bareno, Javier [3 ]
机构
[1] Argonne Natl Lab, Elect Microscopy Ctr, Argonne, IL 60439 USA
[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[3] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA
关键词
LITHIUM-ION CELLS; STRUCTURAL-CHANGES; DENDRITIC GROWTH; SNO2; NANOWIRE; LINI0.8CO0.15AL0.05O2; PERFORMANCE; LITHIATION; FRACTURE; SPECTROSCOPY; DEGRADATION;
D O I
10.1002/aenm.201300015
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We developed a simple approach to carry out in situ electron microscopy of single Li-ion battery cathode particles during electrochemical cycling. We focused on Li(Ni0.8Co0.15Al0.05)O-2-based cathode materials because life-cycle tests suggest a strong contribution of the cathode material to changes in cell impedance. In situ scanning electron microscopy was carried out operando during cycling and at various stages by interrupted cycling. Our work revealed several important aspects of cathode oxide particle dynamics: significant separations develop between grains even during the very first charge (oxide delithiation) and electrolyte penetration through that crack network all the way into the particle interior. Comparing these results to post-test microstructural characterization of oxide particles subjected to extensive cycling confirms the occurrence of these processes in practical cells and suggests that the physical separation and isolation of grains may contribute to performance degradation of lithium-ion cells.
引用
收藏
页码:1098 / 1103
页数:6
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