期刊
ADVANCED MATERIALS
卷 30, 期 51, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201805486
关键词
full cells; high energy and power; long-term cycling stability; organic cathodes; potassium-ion batteries
类别
资金
- National Natural Science Foundation of China [51672078, 21473052, 61474041]
- Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Independent Research Project [71675004]
- Foundation of State Key Laboratory of Coal Conversion [J17-18-903]
Potassium-organic batteries have a great potential for applications in the grid-scale energy storage owing to their low cost and abundant resources, although they suffer from the inferior cycle stability, fast capacity decay, and low power density. A highly reversible phase transformation of the organic cathode during potassiation/depotassiation is the key factor for the capacity retention, as revealed here. Consequently, the potassium-organic battery achieves a high power density of 9796 W kg(-1), a remarkable energy efficiency of 89%, a long cycle stability for 1000 cycles, a superior areal capacity around 2 mA h cm(-2), and a long-term cycling time over 8 months. Besides, the full cells also exhibit a superior rate performance and good cycle stability over 3000 cycles. This work provides new insight into the stabilization of the organic cathode, and demonstrates the enormous potential of organic cathodes for application in high-power potassium-ion batteries (PIBs), which may bring PIBs to new heights.
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