期刊
SMALL
卷 15, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201901285
关键词
binder free; codoping; full cells; potassium ion batteries; vertical graphene
类别
资金
- Science and Technology Planning Project of Guangzhou [201804010196]
- Guangdong Province Higher Vocational Colleges & Schools Pearl River Scholar Funded Scheme (2015)
- Natural Science Foundation of Guangdong Province [2016A030313761]
- Research project of Guangdong Industry Polytechnic [KJFH2018-001]
- Foshan research center for special functional building materials and its green preparation technology [2017-203]
- Pearl River Scholar Foundation of Guangdong Industry Polytechnic [RC2015-001]
- Education Commission of Guangdong Province [2017GkQNCX002, 2017GKCXTD001]
- Guangdong Special Building Materials and Green Preparation Engineering Technology Research Center
With the fast development in flexible electronic technology, power supply devices with high performance, low-cost, and flexibility are becoming more and more important. Potassium ion batteries (KIBs) have a brilliant prospect for applications benefiting from high voltage, lost cost, as well as similar electrochemistry to lithium ion batteries (LIBs). Although carbon materials have been studied as KIBs anodes, their rate capability and cycling stability are still unsatisfactory due to the large-size potassium ions. Herein, a nitrogen (N) and phosphorus (P) dual-doped vertical graphene (N, P-VG) uniformly grown on carbon cloth (N, P-VG@CC) is reported as a binder-free anode for flexible KIBs. With the combined advantages of rich active sites, highly accessible surface, highly conductive network, larger interlayer spacing as well as robust structural stability, this binder-free N, P-VG@CC anode exhibits high capacity (344.3 mAh g(-1)), excellent rate capability (2000 mA g(-1); 46.5% capacity retention), and prominent long-term cycling stability (1000 cycles; 82% capacity retention), outperforming most of the recently reported carbonaceous anodes. Moreover, a potassium ion full cell is successfully assembled on the basis of potassium Prussian blue (KPB)//N, P-VG@CC, exhibiting a large energy density of 232.5 Wh kg(-1) and outstanding cycle stability.
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