A novel composite phase change material design for thermal management and thermal runaway suppression of lithium batteries

CHEN Jianhan; CHEN Xiangyu; LU Lingrui

doi:10.19996/j.cnki.ChinBatlnd.2025.06.007

Abstract：This study pioneers the development of a novel phase change material(PCM).By employing techniques including molecular polarity modulation,low-temperature solvothermal self-assembly,and temperature-zone regulation,it comprehensively addresses technical challenges in traditional PCM such as phase fault,high energy consumption in synthesis,and fixed temperature zones.Leveraging a dynamic hydrogen-bonding network,this material allows an inorganic salt composite system to completely avoid phase separation after 5 000 times cycles,while maintaining a phase change enthalpy retention rate exceeding 98%.The innovative low-temperature synthesis process(≤80℃)reduces energy consumption by 60%compared to conventional melting methods and endows the material with a high thermal conductivity of 0.688 W/(m·K).This PCM can precisely set phase change temperatures across a wide temperature range of-10 to 80℃,with its thermal conductivity automatically increasing as temperature rises,improving temperature control accuracy to±0.3℃.During fast-charging in energy storage applications,the PCM maximums battery temperature below 45℃(with a temperature differential under 1.5℃),extending cycle life by 50%.During fast charging in energy storage applications,the PCM maintains battery temperatures below 45℃(with a temperature difference<1.5℃),extending battery cycle life by 50%.In applications such as chemical battery storage and cold chain systems,the material significantly enhances system energy efficiency and operational temperature stability.This research provides a highly stable,low-energy,and intelligent solution for thermal management systems across multiple scenarios,demonstrating significant engineering value and broad market potential.