08.02.2024

Researchers from the Korea Institute of Science and Technology (KIST) and Lawrence Livermore National Laboratory (LLNL) have made significant progress in developing high-energy-density all-solid-state batteries, aiming for commercialization. Their latest research focuses on the design and synthesis of stable solid electrolytes, crucial for safer and more efficient lithium battery technology.

Image: A couple of batteries are in the foreground with a blurred background.

The high-energy-density all-solid-state batteries are developed with a focus on safer and more efficient lithium battery technology.

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Traditional lithium-ion batteries utilize liquid electrolytes, posing fire and explosion risks. To address this, researchers are exploring non-flammable solid electrolytes. While sulfide-based solid electrolytes offer excellent ionic conductivity, their chemical instability with high-voltage cathode materials has hindered commercial viability. This has increased interest in chloride-based solid electrolytes, known for their stability in high-voltage conditions.

Collaborative research efforts

Led by Dr. Seungho Yu, Dr. Sang Soo Han, and Dr. Brandon Wood, the KIST-LLNL joint research team has developed a fluorine-substituted high-voltage stable chloride-based solid-state electrolyte using computational science. LLNL's advanced supercomputing facilities were instrumental in the design process, with experimental validations conducted at KIST. The synthesized electrolyte demonstrated impressive high-voltage stability exceeding 4 V, comparable to commercial lithium-ion batteries.

Path to commercialization

The collaborative efforts between KIST and LLNL aim to accelerate the commercialization of all-solid-state batteries. Further research will focus on optimizing material synthesis processes and electrode manufacturing techniques. Successful commercialization would enable the U.S.-Korea team to capture a significant share of the solid-state electrolyte market, particularly in the U.S., a major consumer of secondary batteries for energy storage systems and electric vehicles.

Future outlook

This work provides a new design principle for fluorine-substituted high-voltage stable chloride-based solid-state electrolytes, which will accelerate the commercialization of high-energy-density next-generation lithium all-solid-state batteries without fire hazards," emphasized Dr. Seungho Yu of KIST. "This was a systematic, internationally collaborative study that provided computational science-based design principles for the development of a new solid-state electrolyte and validated them experimentally," highlighted Dr. Brandon Wood of LLNL.

This research was supported by the Ministry of Science and ICT through the KIST Major Project and Climate Change Response Technology Development Project, the Ministry of Trade, Industry and Energy, and the Automotive Industry Core Technology Development Project. The findings were published in the latest issue of ACS Energy Letters, an international journal in the field of energy materials.

COMPAMED-tradefair.com; Source: Korea Institute of Science and Technology (KIST)

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