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

作者：Shuaiyu He, Guobao Xu, Zhihao Yan, Huan Hu, Xue Li, Ke Huang, Gang Wang, Liwen Yang, Jianyu Huang, Zhaoying Ren, Dandan Cui, Binbin Xu, Yunxiao Wang, Shi Xue Dou, Yaru Liang, Wei‐Hong Lai · 发表于：Advanced Materials · 年份：2025 · DOI：10.1002/adma.202507782 · 被引用次数：8 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

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.