Journal
SUSTAINABLE ENERGY & FUELS
Volume 4, Issue 3, Pages 1216-1224Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9se00889f
Keywords
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Funding
- National Natural Science Foundation of China [21975283]
- Natural Science Foundation of Jiangsu Province [BK20191343]
- Fundamental Research Funds for the Central University [2017XKQY003]
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Safe, non-toxic and low cost carbonaceous materials, as ideal anodes for potassium ion batteries (KIBs), have broad application foregrounds. However, due to the large radius of K+, the challenges of cycling stability and structural stability of electrode materials are severe. In this paper, a flexible carbon sheet with ultrahigh pyridinic N content and a three-dimensional skeletal structure is reported as a self-supporting anode for KIBs and named HNCS. Herein, the hollow interconnected structure, being similar to a neuronal cell network, can effectively relieve the stress of volume expansion during cycling and provide more potassium storage space. In particular, the content of pyridinic N reaches up to 16.3% in HNCS (the N doping ratios in overall material is 31.7% and the pyridinic N ratios in N content is 57.4%) and is higher than most previous reports about N-doped carbonaceous materials. HNCS as a self-supporting anode shows great electrochemical performance, especially in terms of the superior cycling stability. HNCS delivers an initial charge capacity of 219.3 mA h g(-1) at 100 mA g(-1) and maintains 90% after 200 cycles and still displays a reversible capacity of 134 mA h g(-1) after 500 cycles at 0.5 A g(-1). Besides, the contribution of surface-dominated K-storage is quantitatively analyzed by CV measurements.
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