Volume-complementary bipolar layered oxide enables stable symmetric sodium-ion batteries  

作　　者：Bo Peng Feng Wang Nazir Ahmad Lai Yu Shenghua Chen Genqiang Zhang 

机构地区：[1]School of Materials Science and Engineering,Key Laboratory of Efficient Conversion and Solid-state Storage of Hydrogen and Electricity of Anhui Province,Anhui University of Technology,Ma’anshan 243002,China [2]Hefei National Research Center for Physical Sciences at the Microscale,Chinese Academy of Sciences(CAS)Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China [3]National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology,School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Nano Research》2024年第5期4125-4133,共9页纳米研究（英文版）

基　　金：support from the Natural Science Research Project of Anhui Province Education Department(No.2022AH050334);the Scientific Research Foundation of Anhui University of Technology for Talent Introduction(No.DT2200001211);the Recruitment Program of Global Experts and the Fundamental Research Funds for the Central Universities(No.WK2060000016).

摘　　要：The commercialization of sodium-ion batteries is based on developing low-cost,highly stable,and safe cathode and anode electrodes.However,the promising hard carbon anode and layered oxide cathode suffer from low sodium-embedded potential near 0.1 V and severe phase transitions,which cause safe problem and short lifespan,respectively.Herein,we design a low-strain bipolar P2-Na_(0.7)Ni_(0.25)Fe_(0.2)Ti_(0.55)O_(2) to solve the mentioned obstacles,whereas(Ni,Fe)and Ti provide charge compensation when it is used as cathode and anode,respectively.It is revealed that the bipolar layered oxide undergoes solid-solution reaction when used as cathode or anode,and exhibits volume-complementary feature in a sodium-ion full-cell,as identified by in-situ X-ray diffraction.Remarkably,the safe symmetric sodium-ion full-cell exhibits excellent cyclic stability with 91.7%capacity retention after 200 cycles.This work will provide a new horizon for designing safe and stable sodium-ion batteries.

关 键 词：sodium-ion batteries bipolar layered oxides solid-solution reaction volume complementation symmetric battery 

分 类 号：TM912[电气工程—电力电子与电力传动]