Local electric field facilitates high-performance Li-ion batteries
Date
2017
Authors
Liu, Y.
Zhou, T.
Zheng, Y.
He, Z.
Xiao, C.
Pang, W.K.
Tong, W.
Zou, Y.
Pan, B.
Guo, Z.
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Journal article
Citation
ACS Nano, 2017; 11(8):8519-8526
Statement of Responsibility
Youwen Liu, Tengfei Zhou, Yang Zheng, Zhihai He, Chong Xiao, Wei Kong Pang ... et al.
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Abstract
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 CuGeO<sub>3</sub> 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 CuGeO<sub>3</sub> 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<sup>-1</sup> at 100 mA g<sup>-1</sup>, 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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Dissertation Note
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© 2017 American Chemical Society