期刊
CHEMICAL ENGINEERING JOURNAL
卷 406, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126775
关键词
Amorphous MoS3; functionalized MXene; Electrostatic self-assembly; Lithium-ion batteries; Lithium-sulfur batteries
资金
- National Natural Science Foundation of China [21671136, 21878189]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010379]
- Shenzhen Science and Technology Project Program [JCYJ20190808144413257, JCYJ20180305125729925, JCYJ2017 0818092720054, JCYJ20190808145203535]
- China Postdoctoral Science Foundation [2019 M663074]
The development of multifunctional heterostructure material (MoS3-Ti3C2Tx) showed significant improvement in the performance of rechargeable lithium batteries, exhibiting high specific capacity, excellent rate performance, and long-term cycling stability. Additionally, the material demonstrated high catalytic activity for lithium-sulfur batteries, providing a promising solution for both lithium-sulfur and lithium-ion battery applications.
The development of electrode materials with the synergistic effects of good chemical stability and high electrical conductivity has improved the sluggish ion kinetics and severe capacity degradation of rechargeable lithium batteries. Herein, a multifunctional heterostructure material (MoS3-Ti3C2Tx) comprising a functionalized MXene (Ti3C2Tx) and amorphous MoS3 is prepared by a scalable electrostatic self-assembly method. Remarkably, as lithium-ion battery anodes, the resultant MoS3-Ti3C2Tx not only exhibits increased electrochemical activity, accelerated lithium-ion diffusion and fast charge transfer kinetics but also shows high specific capacity, excellent rate performance and long-term cycling stability. By virtue of these merits, MoS3-Ti3C2Tx offers an excellent reversible capacity of 1043 mAh g(-1) at 200 mA g(-1) and exhibited a capacity of 568 mAh g(-1) at a current density of 2 A g(-1) after 1000 cycles. When acting as the cathode for lithium-sulfur batteries, the amorphous MoS3 anchored on MXene demonstrates high capture and catalytic activity towards polysulfide conversion. Accordingly, the optimized electrode exhibits a capacity of 836 mAh g(-1) at 0.2C after 100 cycles and a satisfactory rate performance of 463 mAh g(-1) at 2C after 400 cycles. Moreover, the associated conversion mechanism is studied by ex situ XPS. These results demonstrate that heterostructure composites constructed by an amorphous sulfide and surface functionalized MXene are feasible electrode materials for both lithium-sulfur batteries and lithium-ion batteries.
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