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Adaptive Stress Response in 2D Graphene@Se Composite toward Ultra-Stable All-Solid-State Lithium-Selenium Batteries
Shuaiyu He1, Guobao Xu1, Zhihao Yan1
1Hunan Provincial Key laboratory of Thin Film Materials and Devices, School of Materials Science and Engineering, Xiangtan University, Hunan, 411105, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|July 3, 2025
Summary
Engineers developed a stress-adaptive graphene@selenium cathode for all-solid-state lithium-selenium batteries (ASSLSeBs). This innovation enhances cycling stability and achieves record energy density for safer, next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state lithium-selenium batteries (ASSLSeBs) promise high energy density and safety.
- Selenium cathodes face challenges due to volume expansion during cycling, causing capacity fade.
Purpose of the Study:
- To develop a stress-adaptive cathode material for ASSLSeBs.
- To improve the cycling stability and energy density of lithium-selenium batteries.
Main Methods:
- Fabrication of a 2D graphene@Se composite cathode using acid-treated expanded graphite (AcEG) to anchor selenium nanoparticles.
- Mechanical characterization to assess the mitigation of Li-ion-induced strain.
- Electrochemical testing of ASSLSeBs with the novel cathode.
Main Results:
- The graphene@Se composite effectively alleviates mechanical stress and enhances charge transport.
- ASSLSeBs demonstrated exceptional cycling stability, retaining capacity after 4000 cycles at 2 C.
- A record energy density of 376.8 Wh kg⁻¹ was achieved in an all-solid-state Li-Se pouch cell.
Conclusions:
- The developed stress-adaptive cathode strategy enables ultra-stable ASSLSeBs.
- This approach paves the way for practical applications of high-performance solid-state batteries.
