CR1620 battery.Korean researchers develop new materials for the production of all-solid-state batteries for electric vehicles

　　According to foreign media reports, South Korean researchers have developed a technology that can be used to make all-solid-state secondary batteries for electric vehicles. Moreover, this type of battery structure can greatly reduce the size of the battery pack while eliminating the risk of battery explosion or fire. The battery will not catch fire or explode even if it is cut with scissors in the air.

　　Currently commercialized secondary batteries are lithium-ion batteries, which use liquid electrolytes. If they are overheated or overcharged, the liquid electrolytes will expand and then explode. According to the Korea Institute of Industrial Technology (KITECH), such solid-state batteries use highly heat-resistant and durable oxide solid electrolyte materials, so there is no risk of explosion or fire.

　　The new battery is constructed by connecting multiple cells together within a single stack, resulting in a high-voltage battery. In addition, the researchers also changed the electrolytes of the positive and negative electrodes from liquid to solid.

　　The researchers created high-strength composite electrolyte sheets using Garnett LLZO (lithium, lanthanum, zirconium and oxygen) material, which is the most efficient material among oxide systems. Although the LLZO material has good safety, it is not conducive to commercialization due to its high cost and relatively slow lithium ion diffusion rate.

　　KITECH stated that their research team minimized the production cost of LLZO powder and adopted a low-cost continuous production process using Taylor chemical reactors. The agency stated that the LLZO powder developed using this process is combined with a small amount of high-strength ion conductive binder to form a composite solid electrolyte sheet.

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