离子
材料科学
阳极
电子
电极
金属
吸附
碱金属
化学物理
纳米技术
化学工程
化学
物理化学
冶金
物理
有机化学
量子力学
工程类
作者
Yuanzheng Chen,Haifei Qin,Jun Zhou,Tong Yang,Bai Sun,Yuxiang Ni,Hongyan Wang,Simon A. T. Redfern,Maosheng Miao,Hai‐Qing Lin,Yuan Ping Feng
标识
DOI:10.1021/acs.jpclett.2c01888
摘要
Two-dimensional (2D) electrides, characterized by excess interstitial anionic electron (IAE) in a crystalline 2D material, offer promising opportunities for the development of electrode materials, in particular in rechargeable metal-ion batteries applications. Although a few such potential electride materials have been reported, they generally show low metal-ion storage capacity, and the effect of IAE on the ion storage performance remains elusive so far. Here we report a novel 2D electride, [Sc3Si2]1+·1e–, with fascinating IAE-driven high alkali metal-ion storage capacity. In particular, its K-ion specific capacity can reach up to 1497 mA h g–1, higher than any previously reported 2D materials-based anodes in K-ion batteries (PIBs). The IAE in the [Sc3Si2]1+·1e– crystal accounts for such high capacity behavior, which can drift away and balance the charge on the metal-cation, playing a crucial role in stabilizing the metal-ion adsorption and enhancing multilayer-ions adsorption. This proposed IAE-driven storage mechanism provides an unprecedented avenue for the future design of high storage capacity electrode materials.
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