Carbon-emcoating architecture boosts lithium storage of Nb2O5

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

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1071-1086
Number of pages16
JournalScience China Materials
Volume64
Issue number5
DOIs
Publication statusPublished - May 2021

Keywords

  • CO2 activation
  • carbon nanohybrids
  • emcoating
  • lithium-ion battery negative electrode
  • mesoporous
  • niobium pentoxide

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