Adaptive Stress Response in 2D Graphene@Se Composite toward Ultra‐Stable All‐Solid‐State Lithium‐Selenium Batteries
Abstract
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.
Article Details
Authors (16)
Shuaiyu He
Hunan Provincial Key laboratory of Thin Film Materials and Devices School of Materials Science and Engineering Xiangtan University Hunan 411105 P. R. China
Guobao Xu
School of Applied Chemistry and Engineering
Zhihao Yan
State Key Laboratory of Semiconductor Physics and Chip Technologies, Institute of Semiconductors, Chinese Academy of Sciences 1 , Beijing 100083,
Huan Hu
Xue Li
Ke Huang
Department of Endocrinology, Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health
Gang Wang
Liwen Yang
Jianyu Huang
Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology
Zhaoying Ren
School of Physics Beihang University Beijing 100191 P. R. China
Dandan Cui
Beibei Xu
Yun‐Xiao Wang
Institute of Energy Materials Science (IEMS) University of Shanghai for Science and Technology Shanghai P. R. China
Shi‐Xue Dou
Institute of Energy Materials Science (IEMS) University of Shanghai for Science and Technology Shanghai P. R. China
Yaru Liang
Wei‐Hong Lai
Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Fudan University Shanghai P. R. China