1. A distinctive strategy of Sb doped quaternary oxide cathodes materials toward energy storage of electric equipment for sodium-ion batteries.
- Author
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Leng, Mingzhe, Xia, Chi, Zhou, Zhanrong, Shen, Xiaofang, Bi, Jianqiang, and Huang, Chen
- Subjects
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ENERGY storage equipment , *CATHODES , *SODIUM ions , *REVERSIBLE phase transitions , *DIFFUSION kinetics , *STORAGE batteries - Abstract
• A distinctive strategy of Sb doped quaternary oxide material is proposed. • The enhanced Na+ diffusion kinetics and meliorative equilibrium conductance is due to the Sb substitution. • The prepared cathode O3-NaNi 0.5-x Mn 0.3 Ti 0.2 Sb 0.03 O 2 reveals discharge capacity of 147.8 mAh g −1. The poor cycle stability and rate capability for sodium-ion batteries is largely due to electrochemical irreversibility and sluggish mobility of Na+ in the cathode materials. Herein, a new strategy of introducing Sb ions into the ternary oxide NiMnTi-based layer-structured cathode material is designed. Reversible phase transition in this cathode NMTSb 0.03 restraint the rapid capacity decay issued from intense volume variation, exhibiting a reversible capacity of 147.8 mAh g−1 and retaining 103.5 mAh g−1 over 200 cycles at 1C. The enough space after Sb substitution allows the effective accommodation of Na+ intercalation and deintercalation, affording a specific capacity of 90 mAh g−1 at 8C. The improvement is attributed to the enhanced Na+ diffusion kinetics with the meliorative equilibrium conductance and the higher cohesive energy after Sb doping. Considering its simple preparation and scale-up capability, the O3-type NaNi 0.5 Mn 0.3 Ti 0.2 O 2 with Sb5+may find extensive applications in designing electrode for sodium-ion batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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