Local electric field facilitates high-performance Li-ion batteries

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dc.contributor.authorLiu, Y.
dc.contributor.authorZhou, T.
dc.contributor.authorZheng, Y.
dc.contributor.authorHe, Z.
dc.contributor.authorXiao, C.
dc.contributor.authorPang, W.K.
dc.contributor.authorTong, W.
dc.contributor.authorZou, Y.
dc.contributor.authorPan, B.
dc.contributor.authorGuo, Z.
dc.contributor.authorXie, Y.
dc.date.issued2017
dc.description.abstractBy 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.
dc.description.statementofresponsibilityYouwen Liu, Tengfei Zhou, Yang Zheng, Zhihai He, Chong Xiao, Wei Kong Pang ... et al.
dc.identifier.citationACS Nano, 2017; 11(8):8519-8526
dc.identifier.doi10.1021/acsnano.7b04617
dc.identifier.issn1936-0851
dc.identifier.issn1936-086X
dc.identifier.orcidGuo, Z. [0000-0003-3464-5301]
dc.identifier.urihttps://hdl.handle.net/2440/133303
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/DP170102406
dc.relation.granthttp://purl.org/au-research/grants/arc/FT150100109
dc.relation.granthttp://purl.org/au-research/grants/arc/FT160100251
dc.rights© 2017 American Chemical Society
dc.source.urihttps://doi.org/10.1021/acsnano.7b04617
dc.subjectCuGeO3
dc.subjectLi-ion migratory behavior
dc.subjectanode
dc.subjectlocal electric field
dc.subjectoxygen vacancies
dc.titleLocal electric field facilitates high-performance Li-ion batteries
dc.typeJournal article
pubs.publication-statusPublished

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