Construction of Co/Ni-Free P2-layered metal oxide cathode with high reversible oxygen redox for sodium ion batteries
To improve the energy and power density of P2-type layered cathode materials in sodium ion batteries, triggering oxygen-related activity is a promising strategy, which has attracted an amount of attention. However, stimulating lattice oxygen activity may inevitably yield adverse effects, such as detrimental structure distortion and irreversible voltage decay. Herein, a low-cost Co/Ni free layered P2-type NaMnCuMgO cathode is designed to construct reversible anion reduction. NaMnCuMgO exhibits an obvious anion reduction electrochemical behavior, confirming that oxygen occurred redox reactions and participated in the capacity compensation process. The density functional theory calculation proves that the presence of the covalency between Cu and O and the lager electron delocalization areas increase the anions redox activity. Furthermore, this compound provides an excellent cyclic stability and high capacity retention of 86 % at 0.2C rate after 100 cycles. In-situ Raman and ex-situ X-ray diffraction absorption spectroscopy reveal the reversible structure evolution and robust P2-type structure. The interaction between Cu and Mg plays a positive role in building the reversible anion reduction in terms of constructing electronic structure and regulating charge balance. Therefore, the Na(Mn-Cu-Mg)O system provides an insight into designing a highly stable cathode material with anion reduction for sodium ion batteries.
Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials[ZDSYS20200421111401738] ; Guangdong-Hong Kong-Macao Joint Laboratory[2019B121205001] ; National Natural Science Function of China ; National Natural Science Foundation of China ; Hunan Provincial Science and Technology Plan Project[2017TP1001]
|WOS Research Area|
Engineering, Environmental ; Engineering, Chemical
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:1
|Document Type||Journal Article|
|Department||Department of Materials Science and Engineering|
1.College of Chemistry and Chemical Engineering,Central South University,Changsha,410083,China
2.Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineering,Central South University,Changsha,410083,China
3.College of Chemistry and Chemical Engineering,Hunan University of Science&Technology,Xiangtan,411201,China
4.Department of Materials Science and Engineering,Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
Ouyang，Baixue,Chen，Tao,Chen，Xinxin,et al. Construction of Co/Ni-Free P2-layered metal oxide cathode with high reversible oxygen redox for sodium ion batteries[J]. CHEMICAL ENGINEERING JOURNAL,2023,452.
Ouyang，Baixue.,Chen，Tao.,Chen，Xinxin.,Fan，Xiaowen.,Wang，Jue.,...&Liu，Kaiyu.(2023).Construction of Co/Ni-Free P2-layered metal oxide cathode with high reversible oxygen redox for sodium ion batteries.CHEMICAL ENGINEERING JOURNAL,452.
Ouyang，Baixue,et al."Construction of Co/Ni-Free P2-layered metal oxide cathode with high reversible oxygen redox for sodium ion batteries".CHEMICAL ENGINEERING JOURNAL 452(2023).
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