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研究论文

Ni/Mn3O4/NiMn2O4@RGO空心微球负极的制备及其储钠性能

  • 颜冲 ,
  • 寇华日 ,
  • 颜波 ,
  • 刘晓静 ,
  • 李德军 ,
  • 李喜飞
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  • 1. 天津师范大学物理与材料科学学院,天津市储能材料表面技术国际联合研究中心,天津 300387;2. 西安理工大学先进电化学能源研究院&材料科学与工程学院,陕西 西安 710048

收稿日期: 2018-07-02

  修回日期: 2018-08-03

  网络出版日期: 2019-02-28

基金资助

获国家自然科学基金(No.51572194)、国家重点研究计划项目(No. 2018YFB0105900 )和天津新材料科学与技术重大专项项目(No. 16ZXCLGX00070)资助

Ni/Mn3O4/NiMn2O4 Double-Shelled Hollow Spheres Embedded into Reduced Graphene Oxide as Advanced Anodes for Sodium-Ion Batteries

  • YAN Chong ,
  • KOU Hua-ri ,
  • YAN Bo ,
  • LIU Xiao-jing ,
  • LI De-jun ,
  • LI Xi-fei
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  • 1. Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials, College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China; 2. Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi’an University of
    Technology, Xi’an, Shanxi 710048, China, Xi’an University of Technology, Xi’an 710048, China

Received date: 2018-07-02

  Revised date: 2018-08-03

  Online published: 2019-02-28

Supported by

This research was supported by the National Natural Science Foundation of China (No. 51572194), the national Key Research and Development Program of China (No. 2018YFB0105900), and the Tianjin Major Program of New Materials Science and Technology (No. 16ZXCLGX00070).

摘要

采用溶剂热法制备前驱体,后经350 °C热处理,首次合成了空心结构的NiMn2O4微球以及不同含量氧化石墨烯包覆的Ni/Mn3O4/NiMn2O4@RGO复合材料. 电化学性能测试表明,复合负极材料中,含25wt%还原氧化石墨烯的材料储钠性能最佳,其在50 mA·g-1电流密度下,100次循环后放电比容量保持在187.8 mAh·g-1,且800 mA·g-1电流密度下的可逆容量高达149.9 mAh·g-1,明显优于NiMn2O4及其他石墨烯基复合材料. 研究指出,复合材料性能的提升得益于空心微球和还原的氧化石墨烯构成的特殊结构,一方面缩短了电子/离子传输距离,缓解了体积效应,另一方面高导电网络有效增强了活性物质利用率.

本文引用格式

颜冲 , 寇华日 , 颜波 , 刘晓静 , 李德军 , 李喜飞 . Ni/Mn3O4/NiMn2O4@RGO空心微球负极的制备及其储钠性能[J]. 电化学, 2019 , 25(1) : 112 -121 . DOI: 10.13208/j.electrochem.180546

Abstract

Delicately building the unique nanocomposite with the combination of hollow structure and reduced graphene oxide (rGO) is highly desirable and still remains a great challenge in the field of energy conversion and storage. In this work, Ni/Mn3O4/NiMn2O4 double-shelled hollow spheres coated by rGO (denoted as R-NMN) have been successfully synthetized via one-step rapid solvothermal treatment followed by subsequent annealing for the first time. Served as anodes for sodium ion batteries (SIBs), the R-NMN composite containing 25wt% rGO exhibits a high discharge capacity of 187.8 mAh·g-1 after 100 cycles at 50 mA·g-1 in the potential range between 0.01 V and 3.0 V (vs. Na+/Na). When cycled at different current densities of 100, 200, 400, and 800 mA·g-1, the nanocomposites deliver the reversible capacities of 213.45, 192.9, 171.7, and 149.9 mAh·g-1, respectively, indicating a satisfactory rate capability. Our conclusions reveal that the significant improvement in electrochemical performance is mainly attributed to the enhanced conductivity, reduced ion diffusion distance and suppressed volume fluctuation. The modification strategy proposed in this study can be extended to the design of other electrode materials for sodium storage and beyond.
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