Research status of iron based fluoride cathode materials for lithium ion battery

doi:10.3969/j.issn.2095-4239.2016.01.005

Abstract

Abstract: With the development of new energy technology, lithium ion batteries (LIBs) are required to have higher energy density. Iron fluorides (FeF₃ and FeF₂), with small molecular weight, multi-electron conversion reaction and high voltage, are good candidates for high energy density cathode materials of LIBs. However, their practical applications are hindered by the intrinsic poor electron conductivity and large over potential needed in the conversion reaction. The paper firstly introduces the basic properties and lithium storage mechanism of FeF₃ and FeF₂, and then describes specifically the approaches for improving the electrochemical performance, mainly including structural expansion and element substitution leading to several kinds of new phases (Fe_xF_y·mH₂O and FeOF), designing porous nanostructures and constructing composite with nanocarbon. The further research in the future is also prospected.

Key words: iron fluoride, structural expansion, porous nanostructure, carbon composite, lithium ion battery

CLC Number:

TM911

ZHANG Yanli, WANG Li, HE Xiangming, LI Jianjun, GAO Jian, ZHAO Peng, ZHANG Yufeng. Research status of iron based fluoride cathode materials for lithium ion battery[J]. Energy Storage Science and Technology, 2016, 5(1): 44-57.

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