Thermally driven mesoscale chemomechanical interplay in Li0.5Ni0.6Mn0.2Co0.2O2 cathode materials
- Univ. of Science and Technology of China, Hefei (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Tianjin Univ., Tianjin (China); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Stanford Univ., Stanford, CA (United States)
- European Synchrotron Radiation Facility, Grenoble (France)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Tianjin Univ., Tianjin (China)
- Univ. of Science and Technology of China, Hefei (China)
- Purdue Univ., West Lafayette, LA (United States)
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. As a result, 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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515; ECCS-1542152; DMR-1832613; DMR-1832707
- OSTI ID:
- 1490862
- Journal Information:
- Journal of Materials Chemistry. A, Vol. 6, Issue 45; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Oxygen Release Degradation in Li‐Ion Battery Cathode Materials: Mechanisms and Mitigating Approaches
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journal | April 2019 |
Quantification of Heterogeneous Degradation in Li‐Ion Batteries
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journal | May 2019 |
Ethylene Carbonate‐Free Electrolytes for High‐Nickel Layered Oxide Cathodes in Lithium‐Ion Batteries
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journal | June 2019 |
Long-term chemothermal stability of delithiated NCA in polymer solid-state batteries
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journal | January 2019 |
Long-Term Chemothermal Stability of Delithiated NCA in Polymer Solid-State Batteries
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text | January 2019 |
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