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Facile fabrication of interconnected-mesoporous T-Nb2O5 nanofibers as anodes for lithium-ion batteries

简单合成连续介孔结构的T-Nb2O5 纳米纤维用作锂离子电池负极

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Abstract

Niobium pentoxide (Nb2O5) has been extensively studied as anode materials for lithium ion batteries (LIBs) due to its good rate performance and safety advantages. However, the intrinsic low electronic conductivity has largely restricted its practical application. In this work, we report the construction of mesoporous T-Nb2O5 nanofibers by electrospinning followed by heat treatment in air. The interconnected mesoporous structure ensures a high surface area with easy electrolyte penetration. When used as anodes for LIBs, the mesoporous Nb2O5 electrode delivers a high reversible specific capacity of 238 mA h g−1 after 1,000 cycles at a current density of 1 A g−1 within a voltage range of 0.01–3.0 V. Even at a higher discharge cut-off voltage window of 1.0–3.0 V, it still possesses a high reversible capacity of 166 mA h g−1 after 200 cycles. Moreover, the porous Nb2O5 electrode also exhibits excellent rate capability. The enhanced electrochemical performances are attributed to the synergistic effects of porous nanofiber structure and unique crystal structure of T-Nb2O5, which has endowed this material a large electrode-electrolyte contact area with improved electronic conductivity.

摘要

五氧化二铌Nb2O5由于其良好的倍率性能和安全性, 作为锂离子电池负极材料被广泛研究. 但是其固有的低电子电导率在很大程度上限制了其电化学性能的发挥. 在本论文中, 我们通过静电纺丝和后续空气热处理构建了具有连续介孔结构的T-Nb2O5纳米纤维. 介孔结构彼此互连, 确保高表面积的同时也促进了电解液的渗透. 当用作锂离子电池负极时在电压窗口为0.01–3.0 V, 电流密度为1 A g−1的条件下, 循环1000圈后可逆比容量达到238 mA h g−1. 即使提高电压窗口到1.0–3.0 V, 在循环200圈后仍然有166 mA h g−1的可逆比容量. 此外, 电极材料还表现出优异的倍率性能. 多孔纳米纤维结构和T-Nb2O5独特晶体结构的协同效应, 增大了电极和电解质的接触面积, 改善了电子传导性, 从而使电化学性能得到提高.

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Acknowledgements

The authors are grateful to the financial supports from Natural Science Foundation of Hunan Province in China (2018JJ1036), and the Innovation Program of Central South University (2017CX001).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. School of Materials Science & Engineering, Central South University, Changsha, 410083, China

    Linzhen Lou  (楼林震), Xiangzhong Kong  (孔祥忠), Ting Zhu  (朱挺), Jiande Lin  (林建德), Shuquan Liang  (梁叔全), Fei Liu  (刘菲), Guozhong Cao  (曹国忠) & Anqiang Pan  (潘安强)

  2. Department of Materials Science & Engineering, University of Washington, Seattle, 98195, USA

    Guozhong Cao  (曹国忠)

Authors
  1. Linzhen Lou  (楼林震)
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  2. Xiangzhong Kong  (孔祥忠)
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  3. Ting Zhu  (朱挺)
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  4. Jiande Lin  (林建德)
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  6. Fei Liu  (刘菲)
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  7. Guozhong Cao  (曹国忠)
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  8. Anqiang Pan  (潘安强)
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Corresponding author

Correspondence to Anqiang Pan  (潘安强).

Additional information

Linzhen Lou is a postgraduate student in Professor Anqiang Pan’s Group and will receive his MSc degree in School of Materials Science and Engineering from Central South University. His current research interest is niobium-based materials for anode of lithium ion battery.

Xiangzhong Kong is a PhD candidate student in School of Materials Science and Engineering from Central South University under the supervision of Professor Anqiang Pan. His research interest is silicon-based anode materials for lithium-ion batteries.

Anqiang Pan is currently a full professor in School of Materials Science and Engineering at Central South University. He worked as visiting students at University of Washington and Pacific Northwest National Laboratory in 2008 and 2009, respectively. Then he worked at Nanyang Technological University as a Research Fellow in 2011. He has published >100 papers in peer-reviewed journals. His current interests are rechargeable batteries, supercapacitors and catalysts.

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Lou, L., Kong, X., Zhu, T. et al. Facile fabrication of interconnected-mesoporous T-Nb2O5 nanofibers as anodes for lithium-ion batteries. Sci. China Mater. 62, 465–473 (2019). https://doi.org/10.1007/s40843-018-9338-6

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