中国物理B ›› 2021, Vol. 30 ›› Issue (8): 88201-088201.doi: 10.1088/1674-1056/abe9ab

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In situ formed FeS2@CoS cathode for long cycling life lithium-ion battery

Xin Wang(王鑫)1, Bojun Wang(汪博筠)1, Jiachao Yang(杨家超)1, Qiwen Ran(冉淇文)1, Jian Zou(邹剑)1, Pengyu Chen(陈鹏宇)1, Li Li(李莉)1, Liping Wang(王丽平)1,2,†, and Xiaobin Niu(牛晓滨)1,‡   

  1. 1 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China;
    2 Tianmu Lake Institute of Advanced Energy Storage Technologies, Changzhou 213300, China
  • 收稿日期:2020-12-17 修回日期:2021-01-29 接受日期:2021-02-25 出版日期:2021-07-16 发布日期:2021-07-16
  • 通讯作者: Liping Wang, Xiaobin Niu E-mail:lipingwang@uestc.edu.cn;xbniu@uestc.edu.cn
  • 基金资助:
    Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2019Z008) and the National Natural Science Foundation of China (Grant No. 52072061).

In situ formed FeS2@CoS cathode for long cycling life lithium-ion battery

Xin Wang(王鑫)1, Bojun Wang(汪博筠)1, Jiachao Yang(杨家超)1, Qiwen Ran(冉淇文)1, Jian Zou(邹剑)1, Pengyu Chen(陈鹏宇)1, Li Li(李莉)1, Liping Wang(王丽平)1,2,†, and Xiaobin Niu(牛晓滨)1,‡   

  1. 1 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China;
    2 Tianmu Lake Institute of Advanced Energy Storage Technologies, Changzhou 213300, China
  • Received:2020-12-17 Revised:2021-01-29 Accepted:2021-02-25 Online:2021-07-16 Published:2021-07-16
  • Contact: Liping Wang, Xiaobin Niu E-mail:lipingwang@uestc.edu.cn;xbniu@uestc.edu.cn
  • Supported by:
    Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2019Z008) and the National Natural Science Foundation of China (Grant No. 52072061).

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摘要： Pyrite FeS2 exhibits an ultrahigh energy density (1671 W·h·kg-1, for the reaction of FeS2+4Li=Fe+2Li2S) in secondary lithium-ion batteries, but its poor cycling stability, huge volume expansion, the shuttle effect of polysulfides, and slow kinetic properties limit its practical application. In this work, we synthesize a composite structure material CoS on FeS2 surface (FeSx@CoS, 1 < x ≤ 2) by using a cobalt-containing MOF to improve its cycle stability. It is found that CoS inhibits the side reactions and adsorbs polysulfides. As a result, the modified FeS2 shows a higher discharge capacity of 577 mA·h·g-1 (919 W·h·kg-1) after 60 cycles than 484 mA·h·g-1 (778 W·h·kg-1) of bare pyrite FeS2. This efficient strategy provides a valuable step toward the realization of high cycling stability FeS2 cathode materials for secondary lithium-ion batteries and enriches the basic understanding of the influence of FeS2 interfacial stability on its electrochemical performances.

关键词: Li-free cathodes, pyrite, lithium metal batteries, first-principles calculation

Abstract: Pyrite FeS2 exhibits an ultrahigh energy density (1671 W·h·kg-1, for the reaction of FeS2+4Li=Fe+2Li2S) in secondary lithium-ion batteries, but its poor cycling stability, huge volume expansion, the shuttle effect of polysulfides, and slow kinetic properties limit its practical application. In this work, we synthesize a composite structure material CoS on FeS2 surface (FeSx@CoS, 1 < x ≤ 2) by using a cobalt-containing MOF to improve its cycle stability. It is found that CoS inhibits the side reactions and adsorbs polysulfides. As a result, the modified FeS2 shows a higher discharge capacity of 577 mA·h·g-1 (919 W·h·kg-1) after 60 cycles than 484 mA·h·g-1 (778 W·h·kg-1) of bare pyrite FeS2. This efficient strategy provides a valuable step toward the realization of high cycling stability FeS2 cathode materials for secondary lithium-ion batteries and enriches the basic understanding of the influence of FeS2 interfacial stability on its electrochemical performances.

Key words: Li-free cathodes, pyrite, lithium metal batteries, first-principles calculation

中图分类号:  (Lithium-ion batteries)

  • 82.47.Aa
82.45.Fk (Electrodes) 31.15.A- (Ab initio calculations)