Mitsubishi Chemical Group: Phase Change Materials IDTechEx spoke to Mitsubishi Chem in 2024 about its THERMINSYNXâ„¢ inter-cell spacer for thermal management and thermal runaway mitigation in Li-ion battery packs. In September 2025, IDTechEx spoke to Mitsubishi Chem about a new material it has developed for EV battery packs, a phase change material (PCM) designed to provide thermal management. Mitsubishi Chemical Group: Phase Change Materials