Fast K-Ion Storage Enabled by N, O Co-Doping and Atomic-Interface Engineering on WS2
WS is a promising anode for potassium-ion batteries due to its high theoretical capacity and unique layered structure. However, the intercalation-dominated K storage, large K diffusion barrier energy, and poor intrinsic electrical conductivity limit its practical application. Based on these problems, a synergetic effect of N, O codoping and atomic-interface engineering is performed for WS, in which interoverlapped superstructure of unilamellar N, O co-doped WS and C (NO-WS-C) is designed to maximize the atomic-interface contact area between WS and carbon. The unique NO-WS-C enables the occurrence of the conversion reaction between WS and K, which produces vast ultrasmall W nanoparticles (∼2 nm), resulting in the construction of a space charge zone on the W surface to enhance K storage. Furthermore, density functional theory calculations indicate that the unique NO-WS-C possesses a low bandgap (0 eV) and K diffusion energy barrier (0.2 eV) to boost K transport. Consequently, an ultrafast K-ion storage capability (107.8 mAh/g at 20C), and an ultralong cycling life over 5000 cycles at 5C with an extremely low capacity loss per cycle of 0.007 % are obtained, which are the best among previously reported WS-based anodes.
Basic and Applied Basic Research Foundation of Guangdong Province[2020A1515110762];National Natural Science Foundation of China;
|WOS Research Area|
Engineering, Environmental ; Engineering, Chemical
|WOS Accession No|
|EI Accession Number|
Anodes ; Atoms ; Density functional theory ; Diffusion barriers ; Ions ; Potassium ; Secondary batteries
|ESI Classification Code|
Alkali Metals:549.1 ; Secondary Batteries:702.1.2 ; Electron Tubes:714.1 ; Probability Theory:922.1 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4
|ESI Research Field|
Cited Times [WOS]:3
|Document Type||Journal Article|
|Department||Department of Mechanical and Energy Engineering|
1.Songshan Lake Materials Laboratory Dongguan,Guangdong,523808,China
2.Shenzhen Engineering Lab for Supercapacitor Materials,Shenzhen Key Laboratory for Advanced Materials,School of Material Science and Engineering,Harbin Institute of Technology,Shenzhen,University Town,Shenzhen,518055,China
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
|Corresponding Author Affilication||Department of Mechanical and Energy Engineering|
Li，Zhenwei,Yuan，Fu,Han，Meisheng,et al. Fast K-Ion Storage Enabled by N, O Co-Doping and Atomic-Interface Engineering on WS2[J]. CHEMICAL ENGINEERING JOURNAL,2022,450.
Li，Zhenwei,Yuan，Fu,Han，Meisheng,&Yu，Jie.(2022).Fast K-Ion Storage Enabled by N, O Co-Doping and Atomic-Interface Engineering on WS2.CHEMICAL ENGINEERING JOURNAL,450.
Li，Zhenwei,et al."Fast K-Ion Storage Enabled by N, O Co-Doping and Atomic-Interface Engineering on WS2".CHEMICAL ENGINEERING JOURNAL 450(2022).
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