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Wang Q, Liu A, Qiao S, Zhang Q, Huang C, Lei D, Shi X, He G, Zhang F. Mott-Schottky MXene@WS 2 Heterostructure: Structural and Thermodynamic Insights and Application in Ultra Stable Lithium-Sulfur Batteries. ChemSusChem 2023; 16:e202300507. [PMID: 37314096 DOI: 10.1002/cssc.202300507] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 06/08/2023] [Accepted: 06/13/2023] [Indexed: 06/15/2023]
Abstract
Due to the "shuttle effect" and low conversion kinetics of polysulfides, the cycle stability of lithium sulfur (Li-S) battery is unsatisfactory, which hinders its practical application. The Mott-Schottky heterostructures for Li-S batteries not only provide more catalytic/adsorption active sites, but also facilitate electrons transport by a built-in electric field, which are both beneficial for polysulfides conversion and long-term cycle stability. Here, MXene@WS2 heterostructure was constructed by in-situ hydrothermal growth for separator modification. In-depth ultraviolet photoelectron spectroscopy and ultraviolet visible diffuse reflectance spectroscopy analysis reveals that there is an energy band difference between MXene and WS2 , confirming the heterostructure nature of MXene@WS2 . DFT calculations indicate that the Mott-Schottky MXene@WS2 heterostructure can effectively promote electron transfer, improve the multi-step cathodic reaction kinetics, and further enhance polysulfides conversion. The built-in electric field of the heterostructure plays an important role in reducing the energy barrier of polysulfides conversion. Thermodynamic studies reveal the best stability of MXene@WS2 during polysulfides adsorption. As a result, the Li-S battery with MXene@WS2 modified separator exhibits high specific capacity (1613.7 mAh g-1 at 0.1 C) and excellent cycling stability (2000 cycles with 0.0286 % decay per cycle at 2 C). Even at a high sulfur loading of 6.3 mg cm-2 , the specific capacity could be retained by 60.0 % after 240 cycles at 0.3 C. This work provides deep structural and thermodynamic insights into MXene@WS2 heterostructure and its promising prospect of application in high performance Li-S batteries.
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Affiliation(s)
- Qian Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Anmin Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Shaoming Qiao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Qiang Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Chunhong Huang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Da Lei
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Xiaoshan Shi
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Gaohong He
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
| | - Fengxiang Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116023, P. R. China
- School of Chemical Engineering, Dalian University of Technology, Panjin, 124221, P. R. China
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