Surface Composition Structure and Electrochemical Performance of Aluminum Doped LiFePO₄

Authors

Huai-fang SHANG, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, P. R. China;
Wei-feng HUANG, NSRL, University of Science and Technology of China, Hefei 230026, P. R. China;
Wang-sheng HU, NSRL, University of Science and Technology of China, Hefei 230026, P. R. China;
Ding-guo XIA, Key lab of theory and technology for advanced batteries materials, College of Engineering, Peking University, Beijing 100871, P. R. China;Follow
Zi-yu WU, NSRL, University of Science and Technology of China, Hefei 230026, P. R. China;

Corresponding Author

Ding-guo XIA(dgxia@pku.edu.cn);
Zi-yu WU

Abstract

Despite there are many successful reports about the preparation of electrode materials with surface coating for lithium ion batteries, the study in surface self-coating of cathode materials using segregation of doping elements and their electrochemical properties is still very rare. The LiFePO₄ particles with rich-Al on the surface were synthesized by one step solvothermal route. TEM results demonstrated that the surface of the obtained LiFePO₄ particles was well-covered by the amorphous coating. The soft X-ray absorption spectroscopy (XAS) and Auger electron spectroscopy (AES) component analyses revealed that the amorphous coating was composed of LiFe_1-xAl_xPO₄ by part of Al substitution to Fe. The LiFePO₄ material with surface rich-Al showed good electrochemical rate capacity and low temperature performance. This could be attributed to the changes of the bulk and surface electron structures which promote the bulk electron and surface ionic conductivities.

Graphical Abstract

Keywords

LiFePO4, surface coating, electrochemical performances

DOI Link

https://doi.org/10.13208/j.electrochem.130354

Publication Date

2013-12-28

Online Available Date

2013-12-23

Revised Date

2013-05-24

Received Date

2013-05-06

Recommended Citation

Huai-fang SHANG, Wei-feng HUANG, Wang-sheng HU, Ding-guo XIA, Zi-yu WU. Surface Composition Structure and Electrochemical Performance of Aluminum Doped LiFePO₄[J]. Journal of Electrochemistry, 2013 , 19(6): 558-564.
DOI: 10.13208/j.electrochem.130354
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss6/9