Reconstruction of magnetic exchange networks for highperformance Co-free Ni-rich cathodesOA
Co-free Ni-rich layered oxide LiNi_(0.8)Mn_(0.2)O_(2) has garnered considerable attention due to its high energy density and low cost.However,under high-voltage operation,its practical application suffers from severe lattice oxygen release and irre-versible H2→H3 transition,resulting in structural degradation and rapid capacity fading.To address this inconvenience,this study proposes a Fe/Zr codoping strategy:the incorporated Fe modulates the local transition metal-oxygen elec-tronic environment and stabilizes the local oxygen coordination environment via Fe-O interactions,while Zr^(4+)exerts a lattice-anchoring effect through strong Zr-O bonding,thereby suppressing oxygen loss and detrimental phase transitions upon deep delithiation.The codoped cathode material retains a well-defined layered structure and exhibits superior elec-trochemical performance;it delivers a high reversible capacity of 207.06 mAh g^(−1) at 0.1 C,achieves capacity retention of 81.55%after 200 cycles at 1 C,and maintains a high rate capability of 141.76 mAh g^(−1) at 5 C.This study provides an effective doping strategy for stabilizing lattice oxygen and modulating charge compensation in Co-free Ni-rich cathode materials.
Zexin Mo;Xiaoyan Xie;Zhiyuan Hua;Zhan Lin;Chenyu Liu;Jiaxiang Cui
School of Light Industry and Chemical Engineering,Guangdong University of Technology,Guangzhou 510006,ChinaState Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,ChinaSchool of Light Industry and Chemical Engineering,Guangdong University of Technology,Guangzhou 510006,ChinaSchool of Light Industry and Chemical Engineering,Guangdong University of Technology,Guangzhou 510006,ChinaSchool of Light Industry and Chemical Engineering,Guangdong University of Technology,Guangzhou 510006,ChinaChemical and Materials Engineering Department,University of Kentucky,Lexington KY40504,United States of America
信息技术与安全科学
lattice oxygen releasehigh performance co free Ni rich cathodesLini Mn Oirreversible H H transitionstructural degradationFe Zr codopingmagnetic exchange networksh h transitionresulting
《Energy Materials and Devices》 2026 (2)
P.31-42,12
granted by National Natural Science Foundation of China(Grant No.22408053).
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