Battery supplier SK On recently announced significant progress in its research on solid-state batteries for electric vehicles, suggesting that breakthroughs have been made that could accelerate the production readiness of these batteries.
SK On disclosed that it is working on developing two types of solid-state batteries: one with a sulfide-based electrolyte and another with an oxide-based electrolyte. The company anticipates having “commercial prototypes” ready by 2027 and 2029, respectively. Additionally, SK On plans to establish a solid-state battery pilot plant at its research facility in Daejeon, South Korea, later this year.
The company credits these advancements to recent breakthroughs that are expected to enhance the longevity of solid-state batteries in the near future. These breakthroughs stem from separate studies aimed at improving the durability of the two solid-state chemistries SK On intends to bring to the market.
BlueOvalSK Battery Park – rendering, September 2021
One of the studies conducted by SK On involved photonic sintering of oxide-based electrolyte materials, which showed promising results in addressing the brittleness of materials produced using current methods while potentially reducing costs. The testing was carried out using a hybrid solid-state battery cell with a gel electrolyte, with SK On suggesting that the findings could apply to all-solid-state batteries as well.
Furthermore, researchers explored lithium- and manganese-rich layered oxide (LMRO) cathodes for sulfide-based solid-state batteries. By applying a special coating to prevent oxidization of the sulfide electrolyte, SK On claims to have achieved a satisfactory lifespan for these cells.
BlueOvalSK Battery Park – rendering, September 2021
While startups often exaggerate their achievements to attract attention, SK On, being a reputable battery manufacturer with automotive clients like Ford, Ferrari, and Hyundai, tends to be more reserved. Therefore, the company’s claim of breakthroughs holds significant weight.
The race to develop commercially viable solid-state batteries has drawn a diverse range of participants, from startups to established companies like SK On, as well as automakers themselves. Honda and Toyota, for instance, are planning to produce solid-state batteries internally by the end of the decade, while other automakers such as Stellantis and Volkswagen are forming partnerships with startups to access this technology.