한국전자기술연구원(KETI, 원장 신희동)은 LG에너지솔루션과의 협력을 통해 전고체전지에 적용할 수 있는 불화마그네슘 기반의 신규 석출형 음극 기술을 개발했다.
Magnesium Fluoride-Used Precipitation-Type Cathode Technology, Performance and Lifetime Improvement

A material technology has been developed that replaces silver (Ag), an expensive material for solid-state batteries based on precipitation-type cathodes, while improving performance and lifespan, and is expected to contribute to the commercialization of solid-state batteries in the future.
The Korea Electronics Technology Institute (KETI, President Shin Hee-dong) announced on the 12th that it has developed a new precipitation-type cathode technology based on magnesium fluoride that can be applied to all-solid-state batteries through collaboration with LG Energy Solution. This research result was selected as the cover paper for an international academic journal in the field of materials chemistry.
All-solid-state batteries are next-generation batteries that use sulfide-based solid electrolytes, and are attracting attention as a game changer that surpasses existing lithium-ion batteries in terms of safety and energy density. Competition to secure technology for commercialization is becoming fierce internationally.
Existing solid-state batteries based on precipitation-type cathodes utilizing silver and carbon have excellent lifespan and characteristics, but mass production has been difficult due to the high cost of silver and the complexity of the manufacturing process. Magnesium is a material that can replace silver and can form a solid solution with lithium metal.
KETI's Next-Generation Battery Research Center succeeded in manufacturing a precipitation-type cathode material by stabilizing magnesium in the form of fluoride and synthesizing it on the surface of carbon particles. The researchers found that uniformly distributed magnesium fluoride forms a magnesium alloy during battery operation, helping lithium ions move in the cathode.
Dr. Jeong Yun-chae's team stated, "We have confirmed the possibility of a new all-solid-state battery system by improving battery characteristics by introducing magnesium fluoride," and "We will work hard to develop new materials and processes for all-solid-state batteries in the future."
The results of this study were published in the latest issue of Advanced Energy Materials, a world-renowned academic journal in the energy field, and were selected as the front cover paper.
Director Yoo Ji-sang said, “KETI is conducting a wide range of research, including all-solid-state battery materials, electrode element technologies, and even battery manufacturing technologies,” and added, “As a key domestic research institute, we will focus on research to commercialize all-solid-state batteries.”
The technology was developed with the support of LG Energy Solution and the Industrial Technology Alchemist Project of the Korea Institute of Industrial Technology Evaluation and Planning.

▲Battery evaluation results using magnesium fluoride and carbon precipitation type cathodes