首页|Surface-to-bulk engineering with high-valence W6+enabling stabilized single-crystal LiNi0.9Co0.05Mn0.05O2 cathode
Surface-to-bulk engineering with high-valence W6+enabling stabilized single-crystal LiNi0.9Co0.05Mn0.05O2 cathode
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Single-crystal Nickel-rich layered oxides has been recognized as one of the promising cathodes for next-generation lithium batteries on account of their high capacity,while its practical application was hin-dered by structural instability and slow Li+transfer kinetics.Herein,a surface-to-bulk engineered single-crystal LiNio.9Coo.05Mno.05O2(Ni90)cathode,which features W-doped bulk and Li2WO4 surface layer,was successfully achieved by a one-step high-valence W6+modification.The as-obtained W-modified Ni90 delivers excellent cycling stability(89.8％capacity retention after 300 cycles at 0.5 C)and rate capability.The enhanced electrochemical performance was ascribed to the doped-W induced stabilized lattice oxygen,reduced Li+/Ni2+mixing and inhibited H2-H3 phase transition in the bulk,and Li2WO4 layer generated stabilized cathode/electrolyte interface.In addition,the thinner LiF-rich cathode electrolyte interphase(CEI)on surface and smaller grain size for W-modified Ni90 benefit to its Li+diffusion dynamics.The effect of high-valence W6+on single-crystal Ni-rich cathode was firstly revealed in detail,which deepens the understanding of electrochemical behavior of Ni-rich cathode with high-valence cations modification,and provides clues for design of high-performance layered cathodes.
Single-crystal Ni-rich cathodeSurface-to-bulk engineeringHigh-valence cationsStructural stabilityInterfacial side reaction
Jun-Ke Liu、Xue-Rui Yang、Chuan-Wei Wang、Zu-Wei Yin、Yi-Yang Hu、Li Deng、Zhen Wang、Yao Zhou、Jun-Tao Li
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College of Energy,Xiamen University,Xiamen 361005,Fujian,China
School of Physics and Materials Science,Nanchang University,Nanchang 330031,Jiangxi,China
College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China
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