期刊
SMALL
卷 14, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801836
关键词
dual carbon-based potassium dual ion batteries; high capacity; high medium discharge voltage; long cycling stability
类别
资金
- National Natural Science Foundation of China [61376068, 11304132, 11304133]
- Fundamental Research Funds for the Central Universities [lzujbky-2017-178, lzujbky-2017-181]
Dual carbon-based potassium dual ion batteries (K-DCBs) have recently attracted ever-increasing attention owing to the potential advantages of high performance-to-cost ratio, good safety, and environmental friendliness. However, the reported K-DCBs still cannot simultaneously meet the requirements of high capacity, long cycling stability, and low cost, which are necessary for practical applications. In this study, a K-DCB with good comprehensive performance including capacity, cycling stability, medium discharge voltage, and energy density is developed by introducing the optimal cathode and anode materials, i.e., KS6 and natural graphite, respectively. An initial capacity of approximate to 54.6 mAh g(-1) and 92.5% capacity retention after 400 cycles can be delivered in a wide voltage window of 2.4-5.4 V at the current density of 100 mA g(-1). A high medium discharge voltage around 4.2 V and an energy density up to 158.3 Wh kg(-1) are meanwhile delivered by the K-DCB. In addition, the working mechanism of the devices is understood in detail. It is believed that valuable contributions to the electrochemical performance improvement of the related devices toward practical applications can be provided by this study.
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