Structural, electrochemical and cycling properties of Nb5+ doped LiNi0.8Co0.1Mn0.1O2 cathode materials at different calcination temperatures for lithium-ion batteries |
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| Authors: | WANG Jiangchao XUE Yuming DAI Hongli WANG Luoxin ZHANG Jiuchao HU Zhaoshuo |
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| Affiliation: | Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China,Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China,Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China,Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China,Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China and Institute of New Energy Intelligence Equipment, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin 300384, China |
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| Abstract: | LiNi0.8Co0.1Mn0.1O2 cathode material is prepared by sol-gel method and the effects of Nb5+ doping and different calcination temperatures on cathode materials were deeply investigated. Structural and morphological characterizations revealed that the optimal content of 1 mol% Nb5+ can stabilize layered structures, mitigate Ni2+ migration to Li layers, improve lithium diffusion capacity, and reduce lattice expansion/shrinkage while cycling. And calcination temperature at 800 °C can not only ensure good morphology, but also suppress the mixed discharge of lithium and nickel in the internal structure. Electrochemical performance evaluation revealed that Nb5+ doping improves the discharge-specific capacity of the material, which is conducive to ameliorating its rate capability and cycle performance. And the material at 800 °C exhibits the highest discharge specific capacity, the best magnification performance, low polarizability, and the best cycle reversibility. |
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