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Defect engineering of a TiO 2 anatase/rutile homojunction accelerating sulfur redox kinetics for high-performance Na-S batteries.

Yue XiaoYelei ZhengGe YaoYuhang ZhangZhiqiang LiShoujie LiuFangcai Zheng
Published in: Dalton transactions (Cambridge, England : 2003) (2024)
Room-temperature sodium-sulfur (RT Na-S) batteries have the drawbacks of the poor shuttle effect of soluble sodium polysulfides (NaPSs) as well as slow sulfur redox kinetics, which result in poor cycling stability and low capacity, seriously affecting their extensive application. Herein, defect engineering is applied to construct rich oxygen vacancies at the interface of a TiO 2 anatase/rutile homojunction (O V -TRA) to enhance sulfur affinity and redox reaction kinetics. Combining structural characterizations with electrochemical analysis reveals that O V -TRA well alleviates the shuttle effect of NaPSs and precipitates the deposition and diffusion kinetics of Na 2 S. Consequently, S/O V -TRA provides excellent electrochemical performance with a reversible capacity of 870 mA h g -1 at 0.1 C after 100 cycles and a long-term cycling capability of 759 mA h g -1 at 1 C after 1000 cycles. This work provides an effective interfacial defect engineering strategy to promote the application of metal oxides in RT Na-S batteries.
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