Suppressing oxygen redox in layered oxide cathode of sodium-ion batteries with ribbon superstructure and solid-solution behavior  

作　　者：Zhi-Xiong Huang Xue-Li Zhang Xin-Xin Zhao Hong-Yan Lü Xin-Yi Zhang Yong-Li Heng Hongbo Geng Xing-Long Wu 

机构地区：[1]MOE Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Changchun,Jilin 130024,China [2]School of Materials Engineering,Changshu Institute of Technology,Changshu,Jiangsu 215500,China [3]Faculty of Chemistry,Northeast Normal University,Changchun,Jilin 130024,China

出　　处：《Journal of Materials Science & Technology》2023年第29期9-17,共9页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(No.52173246);the Science and Tech-nology Development Plan of Suzhou(No.ZXL2022176);Natural Sci-ence Foundation of the Jiangsu Higher Education Institutions(No.22KJA430009)and the“111 Project”(No.B13013).

摘　　要：Sodium-ion batteries(SIBs)are proved as one of the most acceptable candidates for replacing lithium-ion batteries in some fields by virtue of a similar“rocking chair”mechanism and the abundance of sodium.The voltage,rate performance,and energy density of these batteries are mainly determined by the cath-odes.Hence,a Li-Ni-Co co-substituted P2-Na_(0.67)[Li_(0.1)(Mn_(0.7)Ni_(0.2)Co_(0.1))_(0.9)]O_(2)(NLMNC)with ribbon super-structure is prepared with the aim of multi-ion synergistic modification.Owing to the addition of Ni and Co,the Jahn-Teller distortion of Mn can be suppressed corresponding with the improved structural stability,and a little bit of oxygen redox activities is triggered.When with the substitution of 10%Li,the X-ray diffraction(XRD)peaks of NLMNC show the ribbon superstructure at about 21°and 22°.The smooth charge/discharge profiles of the NLMNC cathode exhibit the solid-solution reaction.In addition,the platform at high voltage disappears corresponding with the existing oxygen redox activities being suppressed which may be related to the ribbon superstructure and the promotion of the Ni redox.Such NLMNC cathode can deliver a reversible discharge capacity of 123.5 mA h g^(-1)at 10 mA g^(-1).Even if the current density increases to 500 mA g^(-1),a reversible discharge capacity of 112.8 mA h g^(-1)still can be ob-tained.The distinguished cycling stability is related to the reversible migration of Li+between the metal oxide layer and the interlayer and low volume change during cycling.It is also needing to be mentioned that the capacity retention of NLMNC cathode is about 94.4%(based on the highest discharge capacity)after 100 cycles.This work presents an effective route to develop high-performance cathodes for SIBs.

关 键 词：Sodium-ion batteries Layered oxides Ribbon superstructure Solid-solution reaction 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.12[化学工程—无机化工]