期刊
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
卷 36, 期 3, 页码 431-438出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-020-0120-4
关键词
Bimetallic sulfide; Ti3C2 MXene; Sulfur doping; Anode material; Sodium-ion battery
资金
- National Natural Science Foundation of China [21573110]
- Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD), China
The application of transition metal dichalcogenides(TMDs) as anode materials in sodium-ion batteries (SIBs) has been hindered by low conductivity and poor cyclability. Herein, we report the synthesis of CoxFe1-xS2 bimetallic sulfide/sulfur-doped Ti3C2 MXene nanocomposites(CoxFe1-xS2@S-Ti3C2) by a facile co-precipitation process and thermal-sulfurization reaction. The interconnected 3D frameworks consisting of MXene nanosheets can effectively buffer the volume change and enhance the charge transfer. In particular, sulfur-doped MXene nanosheets provide rich active sites for sodium storage and restrain sulfur loss during charging/discharging processes, leading the increase of specific capacity and cycling the stability of anode materials. As a result, CoxFe1-xS2@S-Ti3C2 anodes exhibited high capacity, high rate capability and long cycle life(399 m center dot Ah/g at 5 A/g with an 94% capacity retention after 600 cycles).
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