Uncovering Temperature‐Insensitive Feature of Phase Change Thermal Storage Electrolyte for Safe Lithium Battery

Lithium-ion batteries (LIBs) have emerged as highly promising energy storage devices due to their high energy density and long cycle life. However, their safety concern, particularly under thermal shock, hinders their widespread applications. Herein, a temperature-insensitive electrolyte (TI-electrolyte) with exceptional resistance to thermal stimuli is presented to address the safety issues arising from the lack of thermal abuse tolerance in LIBs. The TI-electrolyte is composed of two phase-change polymers with differentiation melting points (60 and 35°C for polycaprolactone and polyethylene glycol respectively), delivering a wide temperature-resistant range. It is demonstrated that the TI-electrolyte possesses a heat capacity of 27.3 J g