Ensuring safety during operation is a major issue in the development of lithium-ion batteries. Coating the electrode current collector with thermoresponsive polymer composites is now shown to rapidly shut the battery down when it overheats, and to quickly resume its function when normal operating conditions return.
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Amine, K. Batteries: Polymers switch for safety. Nat Energy 1, 15018 (2016). https://doi.org/10.1038/nenergy.2015.18