O3-type layered transition metal oxide cathodes have attracted considerable attention due to their high sodium storage capacity and straight-forward synthesis process.However,their practical applic-ations are limited ...O3-type layered transition metal oxide cathodes have attracted considerable attention due to their high sodium storage capacity and straight-forward synthesis process.However,their practical applic-ations are limited by irreversible phase transitions,transition metal dissolution,and sluggish Na^(+)diffusion kinetics.Herein,a unique high-entropy oxide(HEO),Na_(0.88)K_(0.02)Ni_(0.24)Li_(0.06)Mg_(0.07)Fe_(0.1)Mn_(0.41)Ti_(0.1)Sn_(0.02)O_(2) is constructed by combining biphasic engineering and dual-site high-entropy doping for stable sodium storage.This synergistic effect significantly improves structural stability,enhances particle integrity,suppresses transition metal dissolution,accelerates electrochemical reaction kinetics,and mitigates electrolyte decomposition during the electrochemical cycling.Therefore,the HEO cathode demonstrates exceptional electrochemical performance,delivering a remarkable rate capability of 74.19 mAh·g^(-1) at 10 C and outstanding cycling stability with 82.68% capacity retention after 1000 cycles.In addition,the practical viability of HEO is confirmed by its outstanding air stability and stable operation of full cells.These findings underscore the potential of synergistic effect of biphasic engineering and dual-site high-entropy doping in developing high-performance cathode materials for sodium-ion batteries.展开更多
基金funded by the National Natural Science Foundation of China(Nos.22005082,52202286,and 22309002)Project supported by the Young Scientists Fund of the National Natural Science Foundation of China(No.12204143)+9 种基金Science Research Project of Hebei Education Department(Nos.CXY2024036 and QN2024190)Special Project of Local Science and Technology Development Guided by the Central Government of China(Nos.226Z4402G and 246Z4410G)Natural Science Foundation of Zhejiang Province(No.LY24B030006)Science and Technology Plan Project of Wenzhou Municipality(No.ZG2024055)Basic Research Project of Wenzhou City(No.G20220016)Natural Science Foundation of Hebei Province(Nos.B2024202022 and B2024202081)the Tianjin Science and Technology Plan Project(No.24JCQNJC00750)Anhui Provincial Natural Science Foundation(No.2308085QB55)Basic Research Program of Shijiazhuang(No.241790717A)the Postdoctoral Funding Project of Hebei Province(No.B2023003015).
文摘O3-type layered transition metal oxide cathodes have attracted considerable attention due to their high sodium storage capacity and straight-forward synthesis process.However,their practical applic-ations are limited by irreversible phase transitions,transition metal dissolution,and sluggish Na^(+)diffusion kinetics.Herein,a unique high-entropy oxide(HEO),Na_(0.88)K_(0.02)Ni_(0.24)Li_(0.06)Mg_(0.07)Fe_(0.1)Mn_(0.41)Ti_(0.1)Sn_(0.02)O_(2) is constructed by combining biphasic engineering and dual-site high-entropy doping for stable sodium storage.This synergistic effect significantly improves structural stability,enhances particle integrity,suppresses transition metal dissolution,accelerates electrochemical reaction kinetics,and mitigates electrolyte decomposition during the electrochemical cycling.Therefore,the HEO cathode demonstrates exceptional electrochemical performance,delivering a remarkable rate capability of 74.19 mAh·g^(-1) at 10 C and outstanding cycling stability with 82.68% capacity retention after 1000 cycles.In addition,the practical viability of HEO is confirmed by its outstanding air stability and stable operation of full cells.These findings underscore the potential of synergistic effect of biphasic engineering and dual-site high-entropy doping in developing high-performance cathode materials for sodium-ion batteries.
