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A Targeted Functional Design for Highly Efficient and Stable Cathodes for Rechargeable Li-Ion Batteries

机译：高效，稳定的可充电锂离子电池阴极的目标功能设计

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摘要

Despite the great success of Li-ion batteries (LIBs) up to now, higher demand has been raised with the emergence of the new generation electrics, such as portable devices and electrical vehicles. Even with the improvement on anodes, the cathodes with high capacity and long-lastingness still remain a challenge. New 3D NiCo2O4@V2O5 core-shell arrays (CSAs) on carbon cloth as cathodes in LIBs have been reported in this work. The nanodesigned materials realize the theoretical specific capacity of V2O5 with high power rate based on the total mass of the framework and amount of active materials. The electrodes achieve superb cycling stability, among the most stable cathodes for LIBs ever reported. From both in situ transmission electron microscopy and quantum level calculations, the 3D NiCo2O4 nanosheet frameworks provide high electron conductivity and the skeleton of the robust CSAs without participating in the lithiation/delithiation; the thickness of the layered V2O5 plays a key role for Li diffusivity and the capacity contribution of electrodes. The structures herein point to new design concepts for high-performance nanoarchitectures for LIB cathodes.
机译：尽管到目前为止，锂离子电池（LIB）取得了巨大的成功，但随着诸如便携式设备和电动汽车之类的新一代电子产品的出现，对锂离子电池提出了更高的要求。即使对阳极进行了改进，具有高容量和长寿命的阴极仍然是一个挑战。在这项工作中，已经报道了在碳布上作为LIB阴极的新型3D NiCo2O4 @ V2O5核-壳阵列（CSA）。纳米设计的材料基于骨架的总质量和活性材料的量，以高功率率实现了V2O5的理论比容量。电极实现了极好的循环稳定性，是有史以来最稳定的LIB阴极。从原位透射电子显微镜和量子能级计算来看，3D NiCo2O4纳米片框架可提供高电子电导率和坚固的CSA骨架，而无需参与锂化/去锂化；层状V2O5的厚度对于Li扩散率和电极的容量贡献起着关键作用。本文的结构指出了用于LIB阴极的高性能纳米体系结构的新设计概念。

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  • 来源
    《Advanced Functional Materials》 |2017年第4期|1604903.1-1604903.9|共9页
  • 作者

    He Guanjie; Han Xiaoyu; Zou Rujia; Zhao Tingting; Weng Zhe; Ho-Kimura SocMan; Lu Yao; Wang Hailiang; Guo Zheng Xiao; Parkin Ivan P.;

  • 作者单位

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England|Yale Univ, Dept Chem, 810 West Campus Dr, West Haven, CT 06516 USA|Yale Univ, Energy Sci Inst, 810 West Campus Dr, West Haven, CT 06516 USA;

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;

    Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China;

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;

    Yale Univ, Dept Chem, 810 West Campus Dr, West Haven, CT 06516 USA|Yale Univ, Energy Sci Inst, 810 West Campus Dr, West Haven, CT 06516 USA;

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;

    Yale Univ, Dept Chem, 810 West Campus Dr, West Haven, CT 06516 USA|Yale Univ, Energy Sci Inst, 810 West Campus Dr, West Haven, CT 06516 USA;

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;

    UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    3D sandwich arrays; cathodes; density functional theory; in situ transmission electron microscopy; Li-ion batteries;

    机译：3D三明治阵列;阴极;密度泛函理论;原位透射电镜;锂离子电池;

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