Kim, Seon Hye Kim, Chang-Sam 2024-01-20T20:33:32Z 2024-01-20T20:33:32Z 2021-09-05 2009-10 1385-3449 https://pubs.kist.re.kr/handle/201004/132102 Zr-doped LiCoO2 cathode materials for lithium ion batteries were synthesized by an ultrasonic spray pyrolysis method. The synthesized powders with less than 1 mol% Zr had a single phase layered structure while those with 5 mol% Zr had a little secondary phase, Li2ZrO3. The cycle stabilities of Zr-doped and undoped LiCoO2 were compared at various charge-discharge rates. The Zr-doped LiCoO2 showed much improved cycle stability compared to the undoped, especially at a high C-rate of 3C (4.2 mA/cm(2)). To investigate the reasons of the improvement, changes of the lattice parameters and the interatomic distances of Co-Co and Co-O of the doped and the undoped powders were analyzed using XRD and EXAFS. The lattice parameters, a and c, increased in the powders with less than 1 mol% Zr, but decreased in the powder with 5 mol% Zr. On the other hand, the interatomic distances of Co-Co and Co-O did not change with Zr doping. From these results, the improved cycle stability is thought to be due to the expanded inter-slab distance, which enhances Li-ion mobility during charge/discharge processes. English SPRINGER LITHIUM-ION BATTERIES MG IMPROVEMENT ELECTRODE CATHODE Improving the rate performance of LiCoO2 by Zr doping Article 10.1007/s10832-008-9414-5 1 JOURNAL OF ELECTROCERAMICS, v.23, no.2-4, pp.254 - 257 JOURNAL OF ELECTROCERAMICS 23 2-4 254 257 scie scopus 000271982300030 2-s2.0-73449093204 Materials Science, Ceramics Materials Science Article LITHIUM-ION BATTERIES MG IMPROVEMENT ELECTRODE CATHODE Lithium ion battery Zirconium-doping Rate performance Slab distance EXAFS