铁基氟化物锂电正极材料研究现状

doi:10.3969/j.issn.2095-4239.2016.01.005

摘要/Abstract

摘要： 随着新能源技术的不断发展,对锂离子电池的能量密度要求越来越高。氟化铁（FeF₃）和氟化亚铁（FeF₂）因具有较小的分子量、多电子转化反应及高电压等优点正成为极具发展潜力的高比能锂电正极材料,但是导电性差、转化反应使得材料需要较大过电势,这制约了其实际应用。本文首先介绍了FeF₃和FeF₂的基本性质及储锂机制,随后具体论述了两者的电化学性能改进措施,主要包括对FeF₃和FeF₂进行晶体结构扩展和元素替换而出现的很多铁基氟化物新相（氟化铁的水合物Fe_xF_y·mH₂O、氟氧化铁FeOF）,纳米多孔结构的设计,碳纳米复合材料构建的研究,并简要展望了未来的发展方向。

关键词: 铁基氟化物, 晶体结构扩展, 多孔纳米, 碳复合, 锂离子电池

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

中图分类号:

TM911

张艳丽, 王莉, 何向明, 李建军, 高剑, 赵鹏, 张玉峰. 铁基氟化物锂电正极材料研究现状[J]. 储能科学与技术, 2016, 5(1): 44-57.

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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