阴极
材料科学
导电体
金属
金属有机骨架
化学工程
纳米技术
无机化学
化学
冶金
复合材料
有机化学
物理化学
工程类
吸附
作者
Yu Mu,James Nyakuchena,Yang Wang,James R. Wilkes,Tongtong Luo,Udayan Mohanty,Brooke Elander,Udayan Mohanty,Junwei Lucas Bao,Jier Huang,Dunwei Wang
标识
DOI:10.1002/anie.202409286
摘要
Rechargeable Mg batteries are a promising energy storage technology to overcome the limitations inherent to Li ion batteries. A critical challenge in advancing Mg batteries is the lack of suitable cathode materials. In this work, we report a cathode design that incorporates S functionality into two-dimensional metal-organic-frameworks (2D-MOFs). This new cathode material enables good Mg2+ storage capacity and outstanding cyclability. It was found that upon the initial Mg2+ insertion and disinsertion, there is an apparent structural transformation that crumbles the layered 2D framework, leading to amorphization. The resulting material serves as the active material to host Mg2+ through reduction and/or oxidation of S and, to a limited extent, O. The reversible nature of S and O redox chemistry was confirmed by spectroscopic characterizations and validated by density functional calculations. Importantly, during the Mg2+ insertion and disinsertion process, the 2D nature of the framework was maintained, which plays a key role in enabling the high reversibility of the MOF cathode.
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