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

作     者：Jianyue Jiao Kang Wu Na Li Enyue Zhao Wen Yin Zhongbo Hu Fangwei Wang Jinkui Zhao Xiaoling Xiao Jianyue Jiao;Kang Wu;Na Li;Enyue Zhao;Wen Yin;Zhongbo Hu;Fangwei Wang;Jinkui Zhao;Xiaoling Xiao

作者机构：College of Materials Science and Opto-electronic TechnologyCenter of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials LaboratoryDongguan 523808GuangdongChina Spallation Neutron Source Science CenterDongguan 523803GuangdongChina Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第10期

页      面：214-222,I0005页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 12105197) the Science Center of the National Science Foundation of China (Grant No. 52088101) the Fundamental Research Funds for the Central Universities the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant ZDKYYQ20170001) 

主　　题：Na-ion battery P2-Na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) Anionic redox reaction Surface Ti doping 

摘      要：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.