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Korean Journal of Chemical Engineering, Vol.36, No.4, 620-624, 2019
Electrochemical characteristics of lithium-excess cathode material (Li1+xNi0.9Co0.05Ti0.05O2) for lithium-ion batteries
A Ni0.9Co0.05Ti0.05(OH)2 precursor was synthesized with the concentration gradient method. To overcome the Li-ion shortage the problem due to the formation of a solid electrolyte interphase (SEI) layer during the initial charge/discharge process in the cathode material, lithium-excess Li1+xNi0.9Co0.05Ti0.05O2 (0≤x≤0.07) cathode materials were investigated by physical and electrochemical analyses. The physical properties of the lithium-excess cathode materials were analyzed using FE-SEM and XRD. A coin type half-cell was fabricated with the electrolyte of 1M LiPF6 dissolved in organic solvents (EC :EMC=1 : 2 vol%). The electrochemical performances were analyzed by the initial charge/discharge efficiency, cycle stability, rate performance and electrochemical impedance spectroscopy (EIS). The initial charge capacity of the cathode material was excellent at about 199.8-201.7mAh/g when the Li/Metal ratio was 1.03-1.07. Additionally, the efficiency of the 6.0 C/0.1 C was 79.2-79.9%. When the Li/Metal ratio was 1.05, the capacity retention showed the highest stability of 97.8% after 50 cycles.
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[Cited By]
- Kwon OH, Kim JK, Korean Chemical Engineering Research, 57(4), 547, 2019
- Kim GJ, Park HW, Lee JD, Korean Chemical Engineering Research, 57(6), 832, 2019
- Song JK, Kim DH, Korean Chemical Engineering Research, 58(1), 1, 2020
- Kwak DY, Lim WG, Shin KS, Cheong IW, Lee JW, Joo J, Korean Journal of Chemical Engineering, 37(7), 1258, 2020
- Lee WM, Park GH, Chang DR, Kwon YC, Korean Journal of Chemical Engineering, 37(12), 2326, 2020
- Saroha R, Ahn JH, Cho JS, Korean Journal of Chemical Engineering, 38(3), 461, 2021
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