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Hollow spherical LiNi0.5Mn1.5O4 built from polyhedra with high-rate performance via carbon nanotube modification

碳纳米管改性的多面体颗粒自组装中空球状LiNi0.5Mn1.5O4及其高倍率性能

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Abstract

Lithium nickel manganese oxide spinel (LiNi0.5Mn1.5O4, LNMO) has attracted much attention as the cathode material for rechargeable lithium-ion batteries due to its high energy density and low cost. However, the short cycle life and poor high-rate capability hinder its commercialization. In this study, we synthesized hollow spherical LNMO built from polyhedral particles. The LNMO hollow structure guarantees sufficient contact with electrolyte and rapid diffusion of lithium ions. To enhance the conductivity, we use carbon nanotubes (CNTs) to modify the surface of the cathode. After CNT modification, the LNMO hollow structure manifests outstanding cycling stability and high-rate capability. It delivers a discharge capacity of 127 mA h g−1 at 5 C, maintaining 104 mA h g−1 after 500 cycles. Even at a high rate of 20 C, a capacity of 121 mA h g−1 can be obtained. The excellent electrochemical performance is ascribed to the unique structure and the enhanced conductivity through CNT modification. It is demonstrated that the CNT-modified hollow spherical LNMO is a promising cathode for lithium ion batteries.

摘要

本文通过调节烧结温度设计构筑了一种纳米多面体颗粒堆积的中空球状LiNi0.5Mn1.5O4材料, 并进一步通过碳纳米管(CNT)的改性来提高材料的循环性能和高倍率性能. 纳米中空结构不仅减少了锂离子的扩散路径, 也保证了电解液和正极材料的充分接触, 三维网状CNT的 改性提高了材料的电子导电率, 从而明显改善了材料的循环和高倍率性能. 最终得到的LNMO-850/CNT材料在5 C的电流密度下初始容量为 127 mA h g−1, 500次循环后容量保持在104 mA h g−1. 而在20 C的高电流密度下容量仍达到121 mA h g−1, 体现了材料优异的循环和高倍率性能.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Luoluo Wang  (王洛洛), Zhengyao Hu  (胡正耀), Kangning Zhao  (赵康宁), Yanzhu Luo  (罗艳珠), Qiulong Wei  (魏湫龙), Chunjuan Tang  (唐春娟), Ping Hu  (胡平), Wenhao Ren  (任文皓) & Liqiang Mai  (麦立强)

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  1. Luoluo Wang  (王洛洛)
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  2. Zhengyao Hu  (胡正耀)
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  3. Kangning Zhao  (赵康宁)
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  4. Yanzhu Luo  (罗艳珠)
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  5. Qiulong Wei  (魏湫龙)
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  6. Chunjuan Tang  (唐春娟)
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  7. Ping Hu  (胡平)
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  8. Wenhao Ren  (任文皓)
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  9. Liqiang Mai  (麦立强)
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Corresponding author

Correspondence to Liqiang Mai  (麦立强).

Additional information

Luoluo Wang received her bachelor degree from Southwest Jiaotong University in 2013. She is currently a graduate student at State key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology. Her research interest focuses on nano energy cathode materials.

Liqiang Mai received his PhD degree from Wuhan University of Technology in 2004 and then worked as a postdoctoral researcher at Georgia Institute of Technology in the group of Prof. Zhonglin Wang from 2006 to 2007. He conducted nanowire based nanodevices and battery research as advanced research scholar in the group of Prof. Charles M Lieber at Harvard University from 2008 to 2011. He was the winner of National Natural Sceince Fund for Distinguished Young Scholars in 2014. His current research field is nano energy materials and micro/nano devices. So far, he has published more than 130 papers tagged by SCI in leading journals.

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Wang, L., Hu, Z., Zhao, K. et al. Hollow spherical LiNi0.5Mn1.5O4 built from polyhedra with high-rate performance via carbon nanotube modification. Sci. China Mater. 59, 95–103 (2016). https://doi.org/10.1007/s40843-016-0120-3

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  • DOI: https://doi.org/10.1007/s40843-016-0120-3

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