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A Comprehensive Cognition for the Capacity Fading Mechanism of FeS2  in Argyrodite-based All-solid-state Lithium Battery
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  • Zhan Wu,
  • Wenkui Zhang,
  • Yang Xia,
  • Hui Huang,
  • Yongping Gan,
  • Xinping He,
  • Xin-Hui Xia,
  • Jun Zhang
Zhan Wu
Zhejiang University of Technology
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Wenkui Zhang
Zhejiang University of Technology

Corresponding Author:msechem@zjut.edu.cn

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Yang Xia
Zhejiang University of Technology
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Hui Huang
Zhejiang University of Technology
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Yongping Gan
Zhejiang University of Technology
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Xinping He
Zhejiang University of Technology
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Xin-Hui Xia
Zhejiang University of Technology
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Jun Zhang
Zhejiang University of Technology
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Abstract

Sulfide solid state electrolyte (SSE) possesses high ionic conductivity and great processability but suffers from narrow electrochemical window. Conversion sulfide cathode FeS2 has higher specific capacity and moderate redox potential, making it appropriate towards sulfide SSE. However, the complex reaction pathway and capacity fading mechanism in FeS2 are rarely studied, especially in all-solid-state lithium battery (ASSLB). Herein, argyrodite sulfide SSE is paired with FeS2 to investigate the electrochemical reaction pathways and the capacity fade mechanism. Instead of single conversion reaction, an anionic redox driven reaction of FeS2 is revealed. The oxidization of Li2S vanishes and large quantity of inactive Li2S accumulates to cause the interfacial deterioration, along with the stress concentration during cycling, which leads to the rapid capacity fade of FeS2. Finally, a simple strategy of slurry-coated composite electrode with highly conductive network is proposed to direct the uniform deposition of Li2S and alleviate the stress concentration.
02 Jan 2023Submitted to EcoMat
03 Jan 2023Submission Checks Completed
03 Jan 2023Assigned to Editor
03 Jan 2023Review(s) Completed, Editorial Evaluation Pending
06 Jan 2023Reviewer(s) Assigned
15 Jan 2023Editorial Decision: Revise Minor
19 Jan 20231st Revision Received
20 Jan 2023Review(s) Completed, Editorial Evaluation Pending
20 Jan 2023Submission Checks Completed
20 Jan 2023Assigned to Editor
23 Jan 2023Reviewer(s) Assigned
27 Jan 2023Editorial Decision: Accept