An all-solid-state battery has been developed that surpasses the energy density of existing secondary batteries. It has excellent durability and operates stably even in extreme situations such as bending or cutting the battery.
The Korea Institute of Energy Research announced on the 21st that Senior Researcher Jang Bo-yoon’s research team at the Energy Storage Research Group developed a composite solid electrolyte for all-solid-state batteries with high ionic conductivity even at room temperature.
A composite solid electrolyte refers to a solid electrolyte material that improves performance by complementing the shortcomings of each solid electrolyte by mixing two or more solid electrolyte materials rather than using the solid electrolyte alone. The role of a solid electrolyte is important for the commercialization of all-solid-state batteries, which are attracting attention as next-generation batteries. Each solid electrolyte material that has been released so far has its own strengths and weaknesses, so the role of a composite solid electrolyte that mixes them together is important.
The composite solid electrolyte developed by the research team is the first in Korea to increase the content limit of 30% of existing oxide-based solid electrolytes to 80%. By using polymer as a binder that acts as an adhesive, the cohesion and stability between materials were improved.
The composite solid electrolyte created in this way has a three-layer sandwich structure with a middle layer containing 80% of the oxide solid electrolyte and a top and bottom layer of a high ionic conductivity polymer electrolyte containing an ion conductive additive. The researchers explained that thanks to the sandwich structure, the resistance of the area where the anode and cathode meet is reduced, and the solid electrolyte increases ionic conductivity by more than 10 times.
The all-solid-state battery using a composite solid electrolyte showed performance (310 Wh/kg) that exceeded the energy density limit (300 Wh/kg) of existing commercial secondary batteries. In addition, it was confirmed that the battery operates stably even when bent or cut, and no ignition or explosion problems occur.
AEGYEON is transferring this technology to ASET, an all-solid-state battery startup. Based on this technology, ASET is setting a goal of commercializing all-solid-state batteries for electric vehicles by 2026.
Park Seok-jeong, CEO of ASET, said, “We are pleased to have this opportunity at a time when global companies are expanding the commercialization of all-solid-state battery technology, and we will do our best in development cooperation for the commercialization of all-solid-state battery technology in the future.”