期刊
JOURNAL OF POWER SOURCES
卷 425, 期 -, 页码 162-169出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2019.04.010
关键词
Zinc ion battery; Cathode material; ZnMn2O4 nanoparticles; N-doped graphene; Excellent cycle performance
资金
- Natural Science Foundation of China [21371180]
- Hunan Provincial Science and Technology Plan Project [2017TP1001]
Rechargeable aqueous zinc ion batteries are considered as a good substitute for large-scale energy storage due to their cost-effectiveness, materials abundance and safety. However, suitable cathode materials with high capacity and long cycling stability are still rare. Herein, we propose the first use of ZnMn2O4/N-doped graphene nano composite as cathode material, which exhibits a maximum discharge capacity of 221 mAh g(-1) at 100 mA g(-1), and ultralong cycle life with 97.4% capacity retention after 2500 cycles at 1000 mA g(-1). The outstanding performance is attributed to the synergistic effect of superfine ZnMn2O4 nanoparticles (21 nm) that provide rapid surface capacitive reaction and short electronic/ion transport path lengths, as well as the highly conductive N doped graphene medium that could facilities the fast electronic transport and stabilizes the composite structure to tolerate volume expansion during charge/discharge process. Significant insight into the zinc ion storage mechanism is confirmed by galvanostatic intermittent titration technique, ex-situ X-ray diffraction, and X-ray photoelectron spectroscopy characterizations. The long-term stability, high specific capacity together with the facile preparation method propose the ZnMn2O4/N-doped graphene hybrid a new class of competitive cathode material for zinc ion battery.
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