Cooperative Jahn-Teller effect and engineered long-range strain in manganese oxide/graphene superlattice for aqueous zinc-ion batteries

作者：Shijian Wang, Xin Guo, Kun Huang, A. Achari, Javad Safaei, Yaojie Lei, Dongfang Li, Qinfen Gu, Chenghua Sun, Lucy Gloag, Steven J Langford, A. Geim, R. R. Nair, Guoxiu Wang · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-60558-y · 被引用次数：73 · 研究领域：Medicine

The Jahn-Teller and cooperative Jahn-Teller effects are phenomena that induce asymmetry in individual ions and solid-state lattices and are commonly observed in structures containing specific transition metals, such as copper and manganese. Although the Jahn-Teller effect causes lattice distortions that stress electrode materials in rechargeable batteries, strategically utilising the strain generated by cooperative Jahn-Teller distortions can enhance structural stability. Here we introduce the cooperative Jahn-Teller effect on MnO2 by constructing a two-dimensional superlattice structure with graphene crated in the bulk MnO2/graphene composite material. The strong interaction between MnO2 and graphene increases the concentration of high-spin Mn3+ ions, creating orderly long-range biaxial strains that are compressive in the out-of-plane direction and tensile in the in-plane direction. These strains mitigate Zn2+ intercalation stress and proton corrosion, enabling over 5000 cycles with 165 mAh g−1 capacity retention at 5 C (1 C = 308 mA g−1) in aqueous zinc-ion batteries. Our approach offers an effective strategy to significantly enhance the lifetime of rechargeable batteries by introducing the cooperative Jahn-Teller effect that overcomes the stress of ion insertion in electrode materials. Lattice distortion in electrode materials often results in battery degradation. Here, the authors exploit a cooperative Jahn-Teller effect in a MnO2/graphene superlattice to create strain-re...