Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 47, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902672
Keywords
carbon nanosheets; high capacity; long cycling; potassium ion storage; ultrahigh nitrogen doping
Categories
Funding
- National Natural Science Foundation of China [51822210, 51802338, 51972329]
- China Postdoctoral Science Foundation [2018M643250]
- Shenzhen Science and Technology Planning Project [JCYJ20170818153404696, JCYJ20170818153427106, JCYJ20180507182512042]
- Science and Technology Planning Project of Guangdong Province [2018A050506066, 2019B090914003]
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Potassium-based energy storage devices (PESDs) are promising candidates for large-scale energy storage applications owing to potassiums abundant in nature, the low standard redox potential (-2.93 V for K/K+ vs the standard hydrogen electrode) of potassium (K), and high ionic conductivity of K-ion based electrolytes. However, lack of proper cathode and anode materials hinder practical applications of PESDs. In this work, carbon nanosheets doped with an ultrahigh content of nitrogen (22.7 at%) are successfully synthesized as an anode material for a K-ion battery, which delivers a high capacity of 410 mAh g(-1) at a current density of 500 mA g(-1), which is the best result among the carbon based anodes for PESDs. Moreover, the battery exhibits an excellent cycling performance with a capacity retention of 70% after 3000 cycles at a high current density of 5 A g(-1). In situ Raman, galvanostatic intermittent titration, and density functional theory calculations reveal that the ultrahigh N-doped carbon nanosheet (UNCN) simultaneously combines the diffusion and pseudocapacitive mechanisms together, which remarkably improves its electrochemical performances in K-ion storage. These results demonstrate the good potential of UNCNs as a high-performance anode for PESDs.
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