Dental resin monomer enables unique NbO2/carbon lithium‐ion battery negative electrode with exceptional performance

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Ji, Qing, Gao, Xiangwen, Zhang, Qiuju, Jin, Liyu, Wang, Da, Xia, Yonggao, Yin, Shanshan, Xia, Senlin, Hohn, Nuri, Zuo, Xiuxia, Wang, Xiaoyan, Xie, Shuang, Xu, Zhuijun, Ma, Liujia, Chen, Liang, Chen, George Z., Zhu, Jin, Hu, Binjie, Müller‐Buschbaum, Peter, Bruce, Peter G. and Cheng, Ya‐Jun (2019) Dental resin monomer enables unique NbO2/carbon lithium‐ion battery negative electrode with exceptional performance. Advanced Functional Materials . 1904961/1-1904961/11. ISSN 1616-301X

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Official URL: https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201904961

Abstract

Niobium dioxide (NbO2) features a high theoretical capacity and an outstanding electron conductivity, which makes it a promising alternative to the commercial graphite negative electrode. However, studies on NbO2 based lithium-ion battery negative electrodes have been rarely reported. In the present work, NbO2 nanoparticles homogeneously embedded in a carbon matrix are synthesized through calcination using a dental resin monomer (bisphenol A glycidyl dimethacrylate, Bis-GMA) as the solvent and a carbon source and niobium ethoxide (NbETO) as the precursor. It is revealed that a low Bis-GMA/NbETO mass ratio (from 1:1 to 1:2) enables the conversion of Nb (V) to Nb (IV) due to increased porosity induced by an alcoholysis reaction between the NbETO and Bis-GMA. The as-prepared NbO2/carbon nanohybrid delivers a reversible capacity of 225 mAh g−1 after 500 cycles at a 1 C rate with a Coulombic efficiency of more than 99.4% in the cycles. Various experimental and theoretical approaches including solid state nuclear magnetic resonance, ex situ X-ray diffraction, differential electrochemical mass spectrometry, and density functional theory are utilized to understand the fundamental lithiation/delithiation mechanisms of the NbO2/carbon nanohybrid. The results suggest that the NbO2/carbon nanohybrid bearing high capacity, long cycle life, and low gas evolution is promising for lithium storage applications.

Item Type:

Article

Additional Information:

This publication is under Global University Publication Licence. Gold OA.

Keywords:

lithium-ion negative electrodes; niobium dioxide/carbon nanohybrids; nanoparticles; thermal polymerization; methacrylate

Schools/Departments:

University of Nottingham Ningbo China > Faculty of Science and Engineering > Department of Chemical and Environmental Engineering
University of Nottingham, UK > Faculty of Engineering > Department of Chemical and Environmental Engineering

Identification Number:

https://doi.org/10.1002/adfm.201904961

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