SEOUL, April 16 (AJP) - A joint research team led by the Korea Advanced Institute of Science and Technology has developed a new design technology for solid-state battery electrolytes that maintains structural stability in air while significantly increasing charging speeds. This advancement addresses the chronic vulnerability of halide-based solid electrolytes to moisture, which has long been a barrier to the mass production of safer energy storage systems. The technology could be applied to various sectors, including electric vehicles, robotics, and urban air mobility. The prominent institute said Thursday.
Unlike conventional lithium-ion batteries that use flammable liquid electrolytes, all-solid-state batteries utilize solid materials to virtually eliminate the risk of fire and explosion. Halide-based solid electrolytes are considered a leading candidate for these batteries due to their high performance, but they typically degrade rapidly when exposed to humidity in the air. This degradation necessitates expensive moisture-free manufacturing environments and raises safety concerns if the battery is exposed to the elements.
To overcome this limitation, the research team introduced a structural technique called oxygen anchoring. This method involves using tungsten to securely bond oxygen within the electrolyte's internal structure, creating a more durable framework. The strong electrostatic attraction of the hexavalent tungsten ensures the oxygen remains fixed, which effectively inhibits the chemical breakdown that occurs when halide materials contact water.
The researchers from the Korea Advanced Institute of Science and Technology (KAIST), collaborated with teams from Dongguk University, Yonsei University, and Chungbuk National University to find that this oxygen-anchored electrolyte remained stable in open-air environments. The structural modification also created wider and smoother paths for lithium ions to travel, resulting in higher efficiency. By lowering the energy barrier for ion movement, the material allows for much faster transfer of electricity.
Laboratory tests confirmed that the new material achieved an ionic conductivity approximately 2.7 times higher than existing zirconium-based halide electrolytes. This improvement suggests that batteries using this material could be charged at much higher speeds without sacrificing safety or performance. The research demonstrated that this design strategy is a universal principle that can be applied to various other halide electrolytes, including those based on indium, yttrium, and erbium.
"This research presents a new material design principle that optimizes multiple performances through a structural design strategy that simultaneously improves air stability and ionic conductivity," Professor Seo Dong-hwa said. "It will serve as a key indicator for future all-solid-state battery research and process development."
Dr. Kim Jae-seung, Park Hee-ju, and Kim Hae-yong served as co-first authors of the study. The findings were published in the international academic journal Advanced Energy Materials on March 6, 2026.
(Reference Information)
Journal/Source: Advanced Energy Materials
Title: Universal Oxychlorination Strategy in Halide Solid Electrolytes for All-Solid-State Batteries
Link/DOI: https://doi.org/10.1002/aenm.202506744
Copyright ⓒ Aju Press All rights reserved.