Publication: Rate dependent structural changes, cycling stability, and Li-ion diffusivity in a layered-layered oxide cathode material after prolonged cycling
Issued Date
2021-06-28
Resource Type
ISSN
20507496
20507488
20507488
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2-s2.0-85108608807
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Materials Chemistry A. Vol.9, No.24 (2021), 14004-14012
Suggested Citation
Songyoot Kaewmala, Wanwisa Limphirat, Visittapong Yordsri, Jeffrey Nash, Sutham Srilomsak, Aniwat Kesorn, Pimpa Limthongkul, Nonglak Meethong Rate dependent structural changes, cycling stability, and Li-ion diffusivity in a layered-layered oxide cathode material after prolonged cycling. Journal of Materials Chemistry A. Vol.9, No.24 (2021), 14004-14012. doi:10.1039/d1ta02293h Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/76603
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Title
Rate dependent structural changes, cycling stability, and Li-ion diffusivity in a layered-layered oxide cathode material after prolonged cycling
Abstract
Li-Rich layered oxide (LLO) cathode materials,xLi2MnO3·(1 −x)LiCoO2(0 <x< 1, M = Mn, Ni, Co,etc.) are considered promising cathode materials in Li-ion batteries for large scale applications. This is because they provide high specific capacities of up to 250 mA h g−1. An electrode material with high energy density and high rate capability (fast charging) is required in EVs to enhance mileage and reduce charging time, respectively. The fast-charging capability of Li-ion batteries is largely determined by the electrochemical kinetic behaviors of their electrodes. Therefore, a deeper understanding about the relationship between cycling rate, structural stability, cyclability, and Li-ion diffusivity behaviors of electrode materials is a critical key to explore high-performance electrode materials for EVs and other high rate applications. In this work, the effects of cycling rates on the structural changes, cycling stability and Li-ion diffusion coefficients of a 0.5Li2MnO3·0.5LiCoO2material were investigated. The results show that the activation of the Li2MnO3component was controlled by the cycling rate. A high cycling rate effectively reduced the Li2MnO3activation and spinel phase evolution, bringing about better cycling stability, and faster Li-ion diffusion after prolonged cycling.