期刊
CELL REPORTS PHYSICAL SCIENCE
卷 2, 期 3, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100351
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资金
- Office of Naval Research [N0001420WX00831]
- Navy Undersea Research Program (Office of Naval Research) [N00014-17-1-2942]
- NRC Research Associateship award at the U.S. Naval Research Laboratory
The intentional application of interelectrode thermal gradients (ITGs) accelerates capacity loss in 35°C cells, with the directionality of the thermal gradient determining the degradation mode. Experimental results showed that when the positive electrode is warmer than the negative electrode, the capacity loss is 77%, while when the negative electrode is warmer, the capacity loss is 100%.
Intentionally applied interelectrode thermal gradients (ITGs) accelerate capacity loss in 35 degrees C cells, and the directionality of the thermal gradient dictates the responsible degradation mode. By simulating cell self-heating at various temperatures and C-rates, we identify 35 degrees C and C/5 as a condition that does not typically exhibit lithium (Li) plating under isothermal conditions but is sensitive to thermal gradients. When subjected to an ITG, we observe 77% capacity fade over 20 cycles when the negative electrode (NE) is warmer than the positive electrode (PE) (Delta T-int = +2 degrees C) and 100% capacity fade when the PE is warmer than the NE (Delta T-int = 2 degrees C). Incremental capacity analysis diagnoses PE degradation for Delta T-int = +2 degrees C and NE degradation for Delta T-int = 2 degrees C. Electrochemical impedance spectroscopy and postmortem optical investigation corroborate these findings. We identify ITGs as a means to achieve accelerated aging of Li-ion cells with the capability to dictate a limiting electrode and/or decouple degradation of each electrode.
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