Kurita Industries has developed "EPSIGUARD KC," a material that prevents the deterioration and ignition of lithium-ion secondary batteries. The company has obtained bulk orders from well-known foreign battery manufacturers and began to supply them. EPSIGUARD KC is the inclusion of a certain proportion of molecules (guest molecules) in a molecular polymer or a molecule having a hole (host molecule) to form an inclusion compound of a specific crystal structure. Kurita Ink Industries not only uses this inclusion compound as a water treatment product, but has also developed an inclusion compound that has previously been used for the solid methanol type fuel cell (DMFC). EPSIGUARD KC has two functions. One is to put this material inside the battery to absorb the gas generated inside the battery. Lithium-ion secondary batteries With charge and discharge, the electrolyte generates carbon dioxide, which may cause the pressure inside the battery to rise, causing the battery to heat and crack, which is also the cause of battery deterioration. EPSIGUARD KC can absorb the carbon dioxide generated during the first charge and aging of the battery, and does not require exhaust. In addition, it is also possible to suppress deterioration due to gas during long-term use, thereby extending battery life. 1g EPSIGUARD KC can absorb about 90mL of carbon dioxide. Another function is to reduce the temperature of flammable gas released under abnormal conditions such as thermal runaway by inclusion of water, thereby preventing the battery from catching fire or smoking. About 4g of EPSIGUARD KC is used per 1Ah battery, and the temperature of the spout gas can be reduced to less than 100°C. Kurita Industries is considering disposing this material on the safety valve and exhaust port of the battery pack to meet the needs of applications such as fixed-type batteries and on-vehicle batteries with higher safety requirements. EPSIGUARD KC is a white powdered inorganic material with a particle size (d90) of 5 μm. In addition, the company can also supply rod-shaped products and sheets made of materials such as polyethylene (PE) and polypropylene (PP). Overseas battery manufacturers that have already begun supply will mix this material into electrode materials to absorb the gas generated by the battery. (Reporter: Hiroshi Koshihiko, Nikkei Technology) Ningbo Wason Lighting Technology Co.,Ltd , https://www.wasonlights.com