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Three-dimensional nitrogen–sulfur codoped layered porous carbon nanosheets with sulfur-regulated nitrogen content as a high-performance anode material for potassium-ion batteries.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 4/28/2020, Vol. 49 Issue 16, p5108-5120, 13p
- Publication Year :
- 2020
-
Abstract
- Three-dimensional nitrogen–sulfur codoped layered porous carbon nanosheets (3D-NSCNs) with sulfur-regulated nitrogen content are constructed as a high-performance anode material for potassium-ion batteries (KIBs) through a gel and nitrogen–sulfur codoping process. Compared with the sample without sulfur doping, the 3D-NSCNs reveal enhanced electrical conductivity, specific surface area, and pyrrolic (N-5) and pyridinic (N-6) nitrogen contents, all of which are beneficial for increased electrochemical performances. After 200 cycles at a current density of 100 mA g<superscript>−1</superscript>, the 3D-NSCNs anode exhibits a specific capacity of 254.9 mA h g<superscript>−1</superscript>. After 2900 cycles at a higher charge–discharge current density of 1 A g<superscript>−1</superscript>, the specific capacity is still 171.1 mA g<superscript>−1</superscript>, and the capacity retention is 78.9%, indicating the application potential of the as-synthesized 3D-NSCNs as an anode material for KIBs. Domination by a surface-driven mechanism is proposed to explain the excellent rate and cycle performances and can also be validated by galvanostatic intermittent titration results, which show that the K<superscript>+</superscript> diffusion coefficient in the 3D-NSCNs is improved after nitrogen–sulfur doping. This work demonstrates a new strategy to improve the electrochemical properties of carbon-based K-storage materials by increasing the N-5 and N-6 contents through sulfur doping while also producing micropores to increase the number of active sites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 49
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 142948252
- Full Text :
- https://doi.org/10.1039/d0dt00697a