한국전자기술연구원(KETI, 원장 신희동)이 전고체전지의 에너지 및 출력 특성을 개선하는 건식 전극용 첨가제 기술을 개발하고, 연구 결과를 국제 저명 학술지에 게재했다.

▲Electrode additive concept diagram
KETI, Successful Development of Next-Generation Cathode Technology for All-Solid-State Batteries
The development of next-generation cathode technology capable of realizing high-performance, high-energy density all-solid-state batteries is expected to help advance the commercialization of all-solid-state batteries in the future.
The Korea Electronics Technology Institute (KETI, President Shin Hee-dong) announced on the 17th that it has developed additive technology for dry electrodes that improves the energy and output characteristics of all-solid-state batteries and published the research results in a renowned international academic journal.
All-solid-state batteries are batteries that replace the liquid electrolyte that fills the space between the positive and negative electrodes of existing lithium-ion batteries with a solid electrolyte. They are safe as there is no risk of explosion, and they have a higher energy density than existing batteries, so there is fierce competition internationally to secure the original technology for commercialization.
In particular, in the case of dry electrodes applicable to all-solid-state batteries, it is possible to implement a 'thick film electrode' in which the positive and negative electrode active material layers are thickly stacked without using the solvent used in wet manufacturing, but there is a problem in that the energy density is lowered due to the generation of pores within the electrode due to the high pressure.
KETI Next-Generation Battery Research Center (Director: Ji-Sang Yoo) has implemented a thinner cathode for sulfide-based all-solid-state batteries by mixing in an additive of lithium salt (LiPO2F2) material with controlled particle size in the manufacturing process of dry electrodes, thereby securing higher capacity and output characteristics per same volume.
According to Dr. Hyunseung Kim (Senior Researcher), who led the technology development,The research team designed and injected finer electrode additives than solid electrolytes, thereby reducing the porosity of the electrodes and comprehensively improving the high energy density performance of the all-solid-state battery by forming a complex structure in which the particles form a protective film on the surface of the anode.
In addition, the chemical-mechanical stability of the electrode was improved by introducing a lithium salt additive, thereby reducing the occurrence of cracks and surface side reactions in the positive electrode.
The results of this study were published in the latest issue (published on April 12) of Advanced Energy Materials (IF=29.698), a world-renowned journal in the field of energy chemistry.
“Most research to secure rapid charging performance of all-solid-state batteries has focused on solid electrolyte materials with high ionic conductivity, but the implementation technology for positive and negative electrode materials is also very important,” said Senior Researcher Woo-Seok Cho (PhD), the corresponding author of the paper. “KETI possesses many next-generation material technologies in the field of all-solid-state batteries, such as single-particle type NCM positive electrode material technology and deposition-type negative electrode material process technology.”
KETI Next-Generation Battery Research Center Director Yoo Ji-sang said, “KETI has secured a cathode plate technology that enables charging over 85% in 4 minutes by applying a thick cathode film technology with an electrode capacity twice that of lithium secondary batteries by fusing a series of cathode material technologies.” He added, “The center will continue to secure core original technologies that go beyond excellent overseas technologies and focus on commercializing domestic all-solid-state batteries.”
Meanwhile, the results of this study were developed through the Automobile Industry Technology Development Project supported by the Ministry of Trade, Industry and Energy and the Korea Institute of Industrial Technology Planning and Evaluation.