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Carbon-emcoating architecture boosts lithium storage of Nb2O5

Ji, Qing; Xu, Zhuijun; Gao, Xiangwen; Cheng, Ya-Jun; Wan, Xiaoyan; Zuo, Xiuxia; Chen, George Z; Hu, Binjie; Zhu, Jin; Bruce, Peter G; Xia, Yonggao

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Authors

Qing Ji

Zhuijun Xu

Xiangwen Gao

Ya-Jun Cheng

Xiaoyan Wan

Xiuxia Zuo

Binjie Hu

Jin Zhu

Peter G Bruce

Yonggao Xia



Abstract

Intercalation transition metal oxides (ITMO) have attracted great attention as lithium-ion battery negative electrodes due to high operation safety, high capacity and rapid ion intercalation. However, the intrinsic low electron conductivity plagues the lifetime and cell performance of the ITMO negative electrode. Here we design a new carbon-emcoating architecture through single CO2 activation treatment as demonstrated by the Nb2O5/C nanohybrid. Triple structure engineering of the carbon-emcoating Nb2O5/C nanohybrid is achieved in terms of porosity, composition, and crystallographic phase. The carbon-embedding Nb2O5/C nanohybrids show superior cycling and rate performance compared with the conventional carbon coating, with reversible capacity of 387 mA h g−1 at 0.2 C and 92% of capacity retained after 500 cycles at 1 C. Differential electrochemical mass spectrometry (DEMS) indicates that the carbon emcoated Nb2O5 nanohybrids present less gas evolution than commercial lithium titanate oxide during cycling. The unique carbon-emcoating technique can be universally applied to other ITMO negative electrodes to achieve high electrochemical performance.

Citation

Ji, Q., Xu, Z., Gao, X., Cheng, Y.-J., Wan, X., Zuo, X., …Xia, Y. (2021). Carbon-emcoating architecture boosts lithium storage of Nb2O5. SCIENCE CHINA Materials, 64(5), 1071-1086. https://doi.org/10.1007/s40843-020-1532-0

Journal Article Type Article
Acceptance Date Sep 30, 2020
Online Publication Date Dec 24, 2020
Publication Date 2021-05
Deposit Date Jan 5, 2021
Publicly Available Date Dec 25, 2021
Journal Science China Materials
Print ISSN 2095-8226
Electronic ISSN 2199-4501
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 64
Issue 5
Pages 1071-1086
DOI https://doi.org/10.1007/s40843-020-1532-0
Keywords niobium pentoxide/carbon nanohybrids, mesoporous, CO2 activation, emcoating, lithium-ion battery negative electrode
Public URL https://nottingham-repository.worktribe.com/output/5201631
Publisher URL https://link.springer.com/article/10.1007/s40843-020-1532-0
Related Public URLs https://engine.scichina.com/publisher/scp/journal/SCMs/doi/10.1007/s40843-020-1532-0?slug=fulltext
Additional Information Received: 2 July 2020; Accepted: 30 September 2020; First Online: 24 December 2020

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