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Tuning anionic redox activity to boost high-performance sodium-storage in low-cost Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) cathode

引用

Journal of Energy Chemistry 2022年第10期31卷 214-222,I0005页

作者： Jianyue Jiao Kang Wu Na Li Enyue Zhao Wen Yin Zhongbo Hu Fangwei Wang Jinkui Zhao Xiaoling Xiao College of Materials Science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Spallation Neutron Source Science Center Dongguan 523803GuangdongChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Na-based layered iron-manganese oxide Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) containing only low-cost elements is a promising cathode for Na-ion batteries used in large-scale energy storage ***,the poor cycle stability restricts its practical *** capacity decay of Na_(0.67)Fe_(0.6)Mn_(0.5)O_(2) mainly originates from the irreversible anionic redox reaction charge compensation due to the high-level hybridization between oxygen and ***,we rationally design a surface ti doping strategy to tune the anionic redox reaction activity of Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) and improve its Na-storage *** doped ti ions not only enlarge the Na migration spacing layer but also improve the structure stability thanks to the strong ti-O *** importantly,the d0-shell electronic structure of ti^(4+) can suppress the charge transfer from the oxidized anions to cations,thus reducing the anionic redox reaction activity and enhancing the reversibility of charge *** modified Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) cathode shows a reversible capacity of 198 mA h g^(-1) and an increased capacity retention from 15% to 73% after about1 month of ***,a superior Na-ion diffusion kinetics and rate capability are also *** work advances the commercialization process of Na-based layered iron-manganese oxide cathodes;on the other hand,the proposed modification strategy paves the way for the design of high-performance electrode materials relying on anionic redox reactions.

关键词： Na-ion battery P2-Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) Anionic redox reaction surface ti doping

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