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Thermally driven mesoscale chemomechanical interplay in Li0.5Ni0.6Mn0.2Co0.2O2 cathode materials

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Abstract

While Li ion batteries are intended to be operated within a mild temperature window, their structural and chemical complexity could lead to unanticipated local electrochemical events that could cause extreme temperature spikes, which, in turn, could trigger more undesired and sophisticated reactions in the system. Visualizing and understanding the response of battery electrode materials to thermal abuse conditions could potentially offer a knowledge basis for the prevention and mitigation of the safety hazards. Here we show a comprehensive investigation of thermally driven chemomechanical interplay in a Li0.5Ni0.6Mn0.2Co0.2O2 (charged NMC622) cathode material. We report that, at the early stage of the thermal abuse, oxygen release and internal Li migration occur concurrently, and are accompanied by mechanical disintegration at the mesoscale. At the later stage, Li protrusions are observed on the secondary particle surface due to the limited lithium solubility in non-layered lattices. The extraction of both oxygen and lithium from the host material at elevated temperature could influence the chemistry and safety at the cell level via rearrangement of the electron and ion diffusion pathways, reduction of the coulombic efficiency, and/or causing an internal short circuit that could provoke a thermal runaway.

Graphical abstract: Thermally driven mesoscale chemomechanical interplay in Li0.5Ni0.6Mn0.2Co0.2O2 cathode materials

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Publication details

The article was received on 15 Sep 2018, accepted on 16 Oct 2018 and first published on 17 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08973F
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Thermally driven mesoscale chemomechanical interplay in Li0.5Ni0.6Mn0.2Co0.2O2 cathode materials

    C. Wei, Y. Zhang, S. Lee, L. Mu, J. Liu, C. Wang, Y. Yang, M. Doeff, P. Pianetta, D. Nordlund, X. Du, Y. Tian, K. Zhao, J. Lee, F. Lin and Y. Liu, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA08973F

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