Kim, S.H. Shim, K.-B. Ahn, J.-P. Kim, C.-S. 2024-01-20T23:05:16Z 2024-01-20T23:05:16Z 2021-09-02 2008-06 1229-7801 https://pubs.kist.re.kr/handle/201004/133468 Zirconium-doped Li1.1Co1-xZrxO2 (0≤x≤0.05) powders as cathode materials for lithium ion batteries were synthesized using an ultrasonic spray pyrolysis method. Cyclic voltammetry and cyclic stability tests were performed, and the changes of microstructure were observed. The solubility limit of zirconium into Li1.1CoO2 was less than 5 mol%, and monoclinic Li2ZrO3 phase was formed above the limit. The Zr-doping suppressed the grain growth and increased the lattice parameters of the hexagonal LiCoO2 phase. The Zr-dopiong of 1 mol% resulted in the best cyclic performance in the range of 3.0∼4.3 V at 1C rate (140mA/g); the initial discharge capacity decreased from 158mAh/g to 60mAh/g in the undoped powder, while from 154mAh/g to 135mAh/g in the Zr-doped powder of 1 mol% after 30 cycles. The excellent cycle stability of Zr-doped powder was due to the low polarization during charge-discharge processes which resulted from the delayed collapse of the crystal structure of the active materials with Zr-doping. Korean Korean Ceramic Society Cathodes Cobalt compounds Crystal structure Cyclic voltammetry Doping (additives) Grain growth Lithium Lithium alloys Lithium compounds Microstructure Powders Spray pyrolysis Stability Charge-discharge cycle Charge-discharge process Cycle stability Initial discharge capacities LiCoO2 Structural stabilities Ultrasonic spray pyrolysis method Zr-doping Lithium-ion batteries Structural stability during charge-discharge cycles in Zr-doped LiCoO 2 powders Article 10.4191/KCERS.2008.45.3.167 1 Journal of the Korean Ceramic Society, v.45, no.3, pp.167 - 171 Journal of the Korean Ceramic Society 45 3 167 171 scopus kci ART001232713 2-s2.0-44949219174 Article Cathodes Cobalt compounds Crystal structure Cyclic voltammetry Doping (additives) Grain growth Lithium Lithium alloys Lithium compounds Microstructure Powders Spray pyrolysis Stability Charge-discharge cycle Charge-discharge process Cycle stability Initial discharge capacities LiCoO2 Structural stabilities Ultrasonic spray pyrolysis method Zr-doping Lithium-ion batteries Cycle stability LiCoO2 Lithium ion battery Microstructure Zr-Doping