A new thermal regulator could enhance the safety of high-capacity lithium-ion batteries

a, Thermal-switching mechanism of the TSM. Under normal working conditions, the thermally conductive network is complete for phonon transportation to ensure thermal conductivity above 1 W m−1 K−1. Under TR conditions, the 2D flakes are separated due to the thermally triggered volume expansion of the microspheres, resulting in a thermal conductivity lower than 0.1 W m−1 K−1. The width of the red arrows represents the strength of heat flux. b, The self-assembly process through freeze-casting of 2D-flake–microsphere suspensions to form an alternating multilayer scaffold together with polymer infiltration. Flakes and microspheres can be uniformly dispersed in water to form a slurry …

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