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

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.

• 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