Ryoji Kanno, a professor at the Tokyo Institute of Technology in Japan, expressed optimism during The Battery Conference at COEX in Gangnam-gu, Seoul, on Mar. 6, saying, “Although there are still many challenges for all-solid-state batteries, I am confident that Korean and Japanese engineers will eventually overcome them.”
An all-solid-state battery replaces the liquid electrolyte found in lithium-ion batteries with a solid electrolyte. This solid electrolyte eliminates the risk of leaks and potential fires, enhancing safety. Additionally, its higher energy density could extend the driving range of electric vehicles.
Kanno is recognized globally for his contributions to all-solid-state battery research. His collaborations with industry leaders, including Toyota, have been pivotal. In 2011, he introduced a material known as lithium, germanium, phosphorus, and sulfur (LGPS-Li10GeP2S12), which boasts ionic conductivity comparable to liquid electrolytes. Toyota is now developing a sulfide-based solid electrolyte inspired by the LGPS structure.
“Just a decade ago, there were doubts about the practical application of all-solid-state batteries. However, the discovery of LGPS has significantly advanced the field,” Kanno said.
“I’m encouraged by our progress, enabling the use of various materials and electrolytes in solid-state batteries. This has spurred the industry to accelerate its research and development efforts toward commercialization.”
The race to commercialize all-solid-state batteries is heating up among South Korean and Japanese companies. Toyota has been a frontrunner with its LGPS, but Samsung SDI is gaining ground with its Argyrodite-type sulfide solid electrolyte. Both companies are targeting 2027 for the commercial release of their all-solid-state batteries. Other industry players like LG Energy Solutions, SK Energy, and Hyundai Motor are also ramping up efforts to mass-produce these batteries.
Kanno noted, “Toyota and Samsung SDI setting specific timelines for their all-solid-state battery projects is a testament to their confidence. However, it’s challenging to determine which approach holds a more competitive edge.”
“Several technical hurdles, such as interfacial (contact-interphase) resistance, still need to be addressed. It’s uncertain whether these technologies will be ready for commercialization by 2027.”
At Interbattery 2024, held alongside The Battery Conference, Samsung SDI revealed its strategy for the mass production of all-solid-state batteries for the first time. The company has expanded its pilot production line for these batteries and completed the production of samples in the first half of 2023. With the establishment of the All Solid Battery (ASB) Commercialization Promotion Team in late 2023, Samsung SDI is now fully engaged in advancing these efforts.
