Adaptive Stress Response in 2D Graphene@Se Composite toward Ultra-Stable All-Solid-State Lithium-Selenium Batteries

Shuaiyu He; Guobao Xu; Zhihao Yan; Huan Hu; Xue Li; Ke Huang; Gang Wang; Liwen Yang; Jianyu Huang; Zhaoying Ren; Dandan Cui; Beibei Xu; Yun-Xiao Wang; Shi-Xue Dou; Yaru Liang; Wei-Hong Lai

doi:10.1002/adma.202507782

Adaptive Stress Response in 2D Graphene@Se Composite toward Ultra-Stable All-Solid-State Lithium-Selenium Batteries

Adv Mater. 2025 Jul 3:e2507782. doi: 10.1002/adma.202507782. Online ahead of print.

Authors

Shuaiyu He¹, Guobao Xu¹, Zhihao Yan¹, Huan Hu¹, Xue Li¹, Ke Huang¹, Gang Wang¹, Liwen Yang², Jianyu Huang¹, Zhaoying Ren³, Dandan Cui³, Beibei Xu⁴, Yun-Xiao Wang⁵, Shi-Xue Dou⁵, Yaru Liang¹, Wei-Hong Lai⁶

Affiliations

¹ Hunan Provincial Key laboratory of Thin Film Materials and Devices, School of Materials Science and Engineering, Xiangtan University, Hunan, 411105, P. R. China.
² School of Physics and Optoelectronics, Xiangtan University, Hunan, 411105, P. R. China.
³ School of Physics, Beihang University, Beijing, 100191, P. R. China.
⁴ State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai, 200050, P. R. China.
⁵ Institute of Energy Materials Science, University of Shanghai for Science and Technology, Shanghai, 200093, P. R. China.
⁶ Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200438, P. R. China.

PMID: 40605666
DOI: 10.1002/adma.202507782

Abstract

All-solid-state lithium-selenium batteries (ASSLSeBs) offer high energy density and improved safety for next-generation energy storage. Still, selenium cathodes suffer from large volume changes during cycling, leading to mechanical stress and rapid capacity fade. To address this, a stress-adaptive 2D graphene@Se composite cathode is developed, where small Se nanoparticles are anchored onto acid-treated expanded graphite (AcEG) to enhance charge transport and alleviate stress. Mechanical characterization confirms that the composite effectively mitigates Li-ion-induced strain. As a result, ASSLSeBs with this cathode achieve exceptional cycling stability with ultrahigh capacity retention after 4000 cycles at 2 C and stable performance for over 400 cycles even under high active-material loading. Furthermore, an all-solid-state Li-Se pouch cell with a record energy density of 376.8 Wh kg⁻¹ is demonstrated, the highest reported for ASSLSeBs. This work presents a strategy for designing stress-adaptive cathodes, enabling ultra-stable ASSLSeBs for practical applications.

Keywords: 2D graphene@Se cathode; adaptive stress; all‐solid‐state lithium‐selenium batteries; superior long‐term stability.

Abstract

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