(Source: KITECH)
According to foreign media reports, South Korean researchers have developed a technology that can make all-solid secondary batteries for electric vehicles. Moreover, this type of battery structure can greatly reduce the volume of the battery pack, while eliminating the risk of battery explosion or fire. Even if the battery is cut with scissors in the air, the battery will not catch fire or explode.
The current commercial secondary batteries are all lithium-ion batteries. These batteries use liquid electrolytes. If overheated or overcharged, the liquid electrolytes will expand and then explode. According to the Korea Institute of Industrial Technology (KITECH), these solid-state batteries use highly heat-resistant and durable oxide solid electrolyte materials, so there is no risk of explosion or fire.
The structure of the new battery is to connect multiple batteries in a single battery stack together to achieve a high-voltage battery. In addition, the researchers also changed the electrolyte of the positive and negative electrodes, from liquid to solid.
The researchers used Garnett LLZO (lithium, lanthanum, zirconium and oxygen) material to make a high-strength composite electrolyte sheet, which is the most efficient material in the oxide system. Although LLZO materials have good safety, due to the high cost, the diffusion rate of lithium ions is relatively slow, which is not conducive to commercialization.
KITECH said 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 said that the LLZO powder developed by this process was combined with a small amount of high-strength ion conductive adhesive to make a composite solid electrolyte sheet. (Author: Yuqiu Yun)
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