Highly reversible lithium storage in uniform Li₄Ti₅O₁₂/carbon hybrid nanowebs as?anode material for lithium-ion batteries

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• 作者：Zunxian Yang^a ; ^{yangzunxian@hotmail.com} ; Qing Meng^b ; Zaiping Guo^b ; ^c ; ^{zguo@uow.edu.au} ; Xuebin Yu^d ; ^{yuxuebin@fudan.edu.cn} ; Tailiang Guo^a ; Rong Zeng^e
• 关键词：Li4Ti5O12/carbon nanowebs ; Electrospinning ; Lithium-ion battery
• 刊名：Energy
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：55
• 期：Complete
• 页码：925-932
• 全文大小：1379 K

文摘

Very large area, uniform Li₄Ti₅O₁₂/carbon composite nanowebs consisting of interconnected nanofibers were synthesized by a simple method based on thermal pyrolysis and oxidation of a composite of electrospun lithium-titanium/polyacrylonitrile nanowebs in argon atmosphere. This novel composite is characterized by the encapsulation of highly uniform nanoscale Li₄Ti₅O₁₂ crystals in the porous cotton-like carbon matrix. This unique structure, consisting of ultra-small crystals in carbon core/shell architecture, is also characterized by high porosity, with many nanopores and mesopores in the composite, and this, together with the high conductive carbon matrix, would facilitate the excellent electrochemical performance of Li₄Ti₅O₁₂/carbon composite nanoweb electrode. The Li₄Ti₅O₁₂/carbon hybrid nanoweb electrodes display a reversible capacity of approximately 160.8?mAhg^?1 at a current density of 30?mAg^?1 and excellent cycling stability. The Li₄Ti₅O₁₂/carbon hybrid nanoweb electrodes also exhibit excellent rate performance, delivering a discharge capacity of over 87?mAhg^?1 at a current density of 3000?mAg^?1. These results indicate that the composite is a promising anode candidate for lithium ion batteries.