Investigation of internal action to enhance structural stability and electrochemical performance of K^(+)/Mg^(2+) co-doped cathodes in high voltage environments utilizing dual coordination  

作　　者：Xuantian Feng Minjie Hou Bowen Xu Yiyong Zhang Da Zhang Yun Zeng Yong Lei Feng Liang 

机构地区：[1]Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province,Kunming University of Science and Technology,Kunming,650093,China [2]National Engineering Research Center of Vacuum Metallurgy,Kunming University of Science and Technology,Kunming,650093,China [3]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,650093,China [4]National and Local Joint Engineering Research Center of Lithium-ion Batteries and Materials Preparation Technology,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,650093,China [5]Tech Univ Ilmenau,Inst Phys&IMN MacroNano,Fachgebiet Angew Nanophys,D-98693,Ilmenau,Germany

出　　处：《Materials Reports(Energy)》2025年第1期43-52,共10页材料导报(能源)(英文)

基　　金：financially supported by the National Natural Science Foundation of China(12175089,12205127,52220105010);the Key Research and Development Program of Yunnan Province(202103AF140006);the Applied Basic Research Programs of Yunnan Provincial Science and Technology Department(202001AW070004,202301AS070051,202301AU070064);Yunnan Industrial Innovative Talents Program for“Xingdian Talent Support Plan”(KKXY202252001);Yunnan Program for Introducing Foreign Talents(202305AO350042);Yunnan Major Scientific and Technological Projects(202202AG050003).

摘　　要：Sodium-ion batteries(SIBs)are emerging as a promising alternative for large-scale energy storage,particularly in grid applications.Within the array of potential cathode materials,Fe/Mn-based layered oxides are notable for their advantageous theoretical specific capacity,economic viability,and environmental sustainability.Nevertheless,the practical application of Fe/Mn-based layered oxides is constrained by their suboptimal cycle performance and rate capability during actual charging and discharging.Ion doping is an effective approach for addressing the aforementioned issues.In this context,we have successfully developed a novel K^(+) and Mg^(2+) codoped P2-Na_(0.7)Fe_(0.5)Mn_(0.5)O_(2) cathode to address these challenges.By doping with 0.05 K^(+) and 0.2 Mg^(2+),the cathode demonstrated excellent cycling stability,retaining 95% of its capacity after 50 cycles at 0.2C,whereas the undoped material retained only 59.7%.Even within a wider voltage range,the co-doped cathode retained 88% of its capacity after 100 cycles at 1C.This work integrated Mg^(2+) to activate oxygen redox reactions in Fe/Mn-based layered cathodes,thereby promoting a reversible hybrid redox process involving both anions and cations.Building on the Mg doping,larger K^(+) ions were introduced into the edge-sharing Na^(+) sites,enhancing the material's cyclic stability and expanding the interplanar distance.The significant improvement of Na^(+) diffusion coefficient by K^(+)/Mg^(2+) co-doping has been further confirmed via the galvanostatic intermittent titration technique(GITT).The study emphasizes the importance of co-doping with different coordination environments in future material design,aiming to achieve high operating voltage and energy density.

关 键 词：Sodium-ion batteries P2 phase K^(+)/Mg^(2+)co-doped Lattice oxygen evolution 

分 类 号：TM9[电气工程—电力电子与电力传动]