Electrochemical Performance And Preparation Of The Thermoresponsive Reversible Self-protective Electrolyte

Electrochemical energy storage devices are prone to short circuit,overcharge and other situations when they are charged and discharged rapidly and the current density is too high,which makes the internal heat of energy storage equipment accumulate too much,resulting in runaway heating and further causing risks such as combustion and explosion.In this paper,the thermoresponsive self-protective microsupercapacitor and aqueous zinc-ion battery based on temperature-dependent electrolyte were fabricated,and the dynamic regulation effect of their electrochemical performance with the change of temperature,the high-temperature inhibition efficiency and the self-protection mechanism were studied and analyzed.The thermoresponsive self-protective microsupercapacitor based on 2wt%MC-g-PEO polymer electrolyte system can perform sol-gel phase transition in the temperature range of 25-80°C while dynamically adjusting its electrochemical performance and the movement of conducting ions.In addition,the smart microsupercapacitor can completely shut down the operation of the circuit at a high temperature of 80°C,and can quickly return to its initial electrochemical performance when the temperature drops to room temperature.And it can be placed in the integrated circuit to monitor the temperature change of the whole circuit system and provide self-protection effect for it.Furthermore,the thermoresponsive self-protective aqueous zinc ion battery based on Pluronic electrolyte was studied.The prepared smart and safe electrolyte can dynamically adjust its electrochemical performance in the temperature range of 25-55℃,and its internal resistance increased from 1.67 kΩat 25℃to 120 kΩat 55℃.The intelligent aqueous zinc ion battery with Na-Mn O₂ as cathode material has a high energy density of 210.2 m Ah h g-1(with the current density of 0.1 A g^-1)at room temperature.When the temperature rises to 55℃,the intelligent aqueous zinc ion battery can cut off the circuit in time and achieve the effect of thermoresponsive self-protection.