Correlation between battery material performance and cooperative electron-phonon interaction in LiCoyMn2-yO4

Ragavendran, Krishna Rao ; Mandal, Prabhat ; Yarlagadda, Sudhakar (2017) Correlation between battery material performance and cooperative electron-phonon interaction in LiCoyMn2-yO4 Applied Physics Letters, 110 (14). p. 143901. ISSN 0003-6951

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Official URL: http://doi.org/10.1063/1.4979542

Related URL: http://dx.doi.org/10.1063/1.4979542

Abstract

Understanding the basic physics related to archetypal lithium battery material (such as LiCoyMn2-yO4) is of considerable interest and is expected to aid the designing of cathodes of high capacity. The relationship between electrochemical performance, activated-transport parameters, thermal expansion, and cooperativity of electron-phonon-interaction distortions in LiCoyMn2-yO4 is investigated. The first order cooperative-normal-mode transition, detected through coefficient of thermal expansion, is found to disappear at a critical doping (y∼0.16); interestingly, for y≳0.16, the resistivity does not change much with doping, and the electrochemical capacity becomes constant over repeated cycling. The critical doping y∼0.16 results in breakdown of the network of cooperative/coherent normal-mode distortions; this leads to vanishing of the first-order transition, establishment of hopping channels with lower resistance, and enhancing lithiation and delithiation of the battery, thereby minimizing electrochemical capacity fading.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:122790
Deposited On:16 Aug 2021 10:21
Last Modified:16 Aug 2021 10:21

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