Size-dependent surface phase change of lithium iron phosphate during carbon coating

Jiajun Wang, Jinli Yang, Yongji Tang, Jian Liu, Yong Zhang, Guoxian Liang, Michel Gauthier, Yu-chen Karen Chen-Wiegart, Mohammad Norouzi Banis, Xifei Li, Ruying Li, Jun Wang, T. K. Sham and Xueliang Sun ()
Additional contact information
Jiajun Wang: Western University
Jinli Yang: Western University
Yongji Tang: Western University
Jian Liu: Western University
Yong Zhang: Western University
Guoxian Liang: Clariant (Canada)
Michel Gauthier: Clariant (Canada)
Yu-chen Karen Chen-Wiegart: Photon Sciences Directorate, Brookhaven National Laboratory
Mohammad Norouzi Banis: Western University
Xifei Li: Western University
Ruying Li: Western University
Jun Wang: Photon Sciences Directorate, Brookhaven National Laboratory
T. K. Sham: Western University
Xueliang Sun: Western University

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Carbon coating is a simple, effective and common technique for improving the conductivity of active materials in lithium ion batteries. However, carbon coating provides a strong reducing atmosphere and many factors remain unclear concerning the interface nature and underlying interaction mechanism that occurs between carbon and the active materials. Here, we present a size-dependent surface phase change occurring in lithium iron phosphate during the carbon coating process. Intriguingly, nanoscale particles exhibit an extremely high stability during the carbon coating process, whereas microscale particles display a direct visualization of surface phase changes occurring at the interface at elevated temperatures. Our findings provide a comprehensive understanding of the effect of particle size during carbon coating and the interface interaction that occurs on carbon-coated battery material—allowing for further improvement in materials synthesis and manufacturing processes for advanced battery materials.

Date: 2014
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DOI: 10.1038/ncomms4415

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