材料科学
电场
纳米技术
离子
领域(数学)
工程物理
化学
纯数学
物理
数学
有机化学
量子力学
作者
Youwen Liu,Tengfei Zhou,Yang Zheng,Zhihai He,Chong Xiao,Wei Kong Pang,Wei Tong,Youming Zou,Bicai Pan,Zhanhu Guo,Yi Xie
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-07-26
卷期号:11 (8): 8519-8526
被引量:167
标识
DOI:10.1021/acsnano.7b04617
摘要
By scrutinizing the energy storage process in Li-ion batteries, tuning Li-ion migration behavior by atomic level tailoring will unlock great potential for pursuing higher electrochemical performance. Vacancy, which can effectively modulate the electrical ordering on the nanoscale, even in tiny concentrations, will provide tempting opportunities for manipulating Li-ion migratory behavior. Herein, taking CuGeO3 as a model, oxygen vacancies obtained by reducing the thickness dimension down to the atomic scale are introduced in this work. As the Li-ion storage progresses, the imbalanced charge distribution emerging around the oxygen vacancies could induce a local built-in electric field, which will accelerate the ions' migration rate by Coulomb forces and thus have benefits for high-rate performance. Furthermore, the thus-obtained CuGeO3 ultrathin nanosheets (CGOUNs)/graphene van der Waals heterojunctions are used as anodes in Li-ion batteries, which deliver a reversible specific capacity of 1295 mAh g-1 at 100 mA g-1, with improved rate capability and cycling performance compared to their bulk counterpart. Our findings build a clear connection between the atomic/defect/electronic structure and intrinsic properties for designing high-efficiency electrode materials.
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