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Reducing Gases Triggered Cathode Surface Reconstruction for Stable Cathode-Electrolyte Interface in Practical

Bingkai Zhang1,2, Zhiwei He1, Tiefeng Liu3

  • 1Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China.

Advanced Materials (Deerfield Beach, Fla.)
|October 18, 2023
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Summary
This summary is machine-generated.

A new gas-solid interface reduction reaction (GSIRR) creates a surface reconstruction layer (SRL) on cathodes, significantly improving all-solid-state lithium-ion battery performance and stability.

Keywords:
all-solid-statecathodelithium-ion batteriessolid electrolytesurface reconstruction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Interfacial compatibility between cathodes and sulfide solid-electrolytes (SEs) is crucial for all-solid-state lithium-ion batteries (ASSLBs).
  • Surface oxygen reactivity in cathodes limits electrochemical performance.

Purpose of the Study:

  • To develop a novel surface reconstruction layer (SRL) to enhance cathode-electrolyte interfaces in ASSLBs.
  • To investigate the gas-solid interface reduction reaction (GSIRR) mechanism for surface modification.

Main Methods:

  • Applied a CoO/Li2CO3 SRL onto LiCoO2 (LCO) cathodes using GSIRR.
  • Evaluated electrochemical performance, including capacity, cyclability, and rate capability.
  • Tested interfacial stability with sulfide solid-electrolytes (Li10GeP2S12 and Li3PS4).

Main Results:

  • The SRL-modified LCO cathode exhibited high capacity (149.7 mAh g-1), excellent cyclability (84.63% retention over 400 cycles), and superior rate capability (86.1 mAh g-1 at 2 C).
  • Demonstrated exceptional stability in high-loading cathodes.
  • Enhanced interfacial stability between LCO and various sulfide SEs.

Conclusions:

  • The GSIRR strategy effectively mitigates cathode-electrolyte reactivity by forming a protective SRL.
  • The GSIRR mechanism shows broad applicability to different cathode materials (e.g., LiNi0.8Co0.1Mn0.1O2) and reducing gases (H2S, CO).
  • Surface reconstruction via GSIRR is a promising approach for designing high-performance ASSLBs.