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Journal of Electrochemistry ›› 2019, Vol. 25 ›› Issue (1): 112-121.doi: 10.13208/j.electrochem.180546

• Special Issue of Next-Generation Secondary Batteries • Previous Articles     Next Articles

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

YAN Chong1, KOU Hua-ri2, YAN Bo2, LIU Xiao-jing1, LI De-jun1, LI Xi-fei1,2*   

  1. 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:2018-07-02 Revised:2018-08-03 Online:2019-02-28 Published:2018-08-20
  • Contact: LI Xi-fei E-mail:xfli2011@hotmail.com
  • 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).

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.

Key words: Ni/Mn3O4/NiMn2O4, reduced graphene oxide, anode materials, sodium-ion batteries

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