Boron-doped high-entropy oxide toward high-rate and long-cycle layered cathodes for wide-temperature sodium-ion batteries  

作　　者：Yuzhen Dang Zhe Xu Yurong Wu Runguo Zheng Zhiyuan Wang Xiaopin Lin Yanguo Liu Zheng-Yao Li Kai Sun Dongfeng Chen Dan Wang 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China [2]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China [3]Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,Hebei,China [4]Neutron Scattering Laboratory,Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China

出　　处：《Journal of Energy Chemistry》2024年第8期577-587,I0012,共12页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52071073,52177208,and52171202);Hebei Province“333 talent project”(No.C20221012);the Science and Technology Project of Hebei Education Department(BJK2023005);Hebei Province Graduate Innovation Funding Program CXZZBS2024177。

摘　　要：03-type layered metal oxides hold great promise for sodium-ion batteries cathodes owing to their energy density advantage.However,the severe irreversible phase transition and sluggish Na^(+)diffusion kinetics pose significant challenges to achieve high-performance layered cathodes.Herein,a boron-doped03-type high entropy oxide Na(Fe_(0.2)Co_(0.15)Cu_(0.05)Ni_(0.2)Mn_(0.2)Ti_(0.2))B_(0.02)O_(2)(NFCCNMT-B_(0.02))is designed and the covalent B-O bonds with high entropy configuration ensure a robust layered structure.The obtained cathode NFCCNMT-B_(0.02)exhibits impressive cycling performance(capacity retention of 95%and 82%after100 cycles and 300 cycles at 1 and 10 C,respectively)and outstanding rate capability(capacity of 83 mAh g^(-1)at 10 C).Furthermore,the NFCCNMT-B_(0.02)demonstrates a superior wide-temperature performance,maintaining the same capacity level(113,4 mAh g^(-1)@-20℃,121 mAh g^(-1)@25℃,and 119 mAh g^(-1)@60℃)and superior cycle stability(90%capacity retention after 100 cycles at 1 C at-20℃).The high-entropy configuration design with boron doping strategy contributes to the excellent sodium-ion storage performance.The high-entropy configuration design effectively suppresses irreversible phase transitions accompanied by small volume changes(ΔV=0.65 A3).B ions doping expands the Na layer distance and enlarges the P3 phase region,thereby enhancing Na^(+)diffusion kinetics.This work offers valuable insights into design of high-performance layered cathodes for sodium-ion batteries operating across a wide temperature.

关 键 词：High entropy oxide Born substitution Phase transition Na~+diffusion kinetics Sodium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]