Yonsei scientists develop a fluoride solid electrolyte that pushes all-solid-state batteries beyond 5 volts safely.
In a stunning leap for energy storage science, researchers at Yonsei University have developed a fluoride-based solid electrolyte that pushes all- solid-state batteries beyond the long-impenetrable 5-volt limit, without compromising safety or conductivity.
The discovery could mark the beginning of a new era for electric vehicles and renewable energy storage systems, where batteries last longer, charge faster, and store more energy.Professor Yoon Seok Jung and his team introduced a fluoride solid electrolyte, LiCl–4Li₂TiF₆, that maintains stability at voltages exceeding 5 V.For decades, such high-voltage operation was considered out of reach because most solid electrolytes, including sulfides and oxides, break down above 4 V.“Our fluoride solid electrolyte, LiCl–4Li₂TiF₆, opens a previously forbidden route for high-voltage operation in solid-state batteries, marking a true paradigm shift in energy storage design,” said Prof. Jung.Fluoride’s energy revolutionThe team’s innovation delivers both high voltage and high ionic conductivity—1.7 × 10⁻⁵ S/cm at 30°C, one of the best in its category.This unique performance allows it to pair with high-energy spinel cathodes such as LiNi₀.₅Mn₁.₅O₄ , a material known for efficiency but previously hindered by electrolyte instability.When used as a protective coating on cathodes, the fluoride electrolyte prevents the interfacial breakdown that typically limits battery life.The result is impressive: the solid-state battery retained over 75% capacity after 500 charge cycles and achieved an ultrahigh areal capacity of 35.3 mAh/cm², a record for solid-state systems.Even in pouch-type batteries, the same format used in electric vehicles and electronics, the system demonstrated consistent performance, indicating real-world viability.The Yonsei team’s fluoride-based approach does more than improve a single battery, it redefines how ASSBs can be designed.By introducing a “fluoride-based shield,” the researchers created an electrolyte that’s not only stable but also compatible with cost-efficient halide catholytes, including Zr-based systems.This compatibility could reduce material costs while improving safety and longevity: two major hurdles in scaling solid-state batteries commercially.Powering a sustainable futureBeyond its technical promise, the development has deep industrial implications. High-voltage, stable solid electrolytes are the missing piece for electric vehicles capable of longer ranges and faster charging without thermal risks.The fluoride compound’s thermal stability and mechanical robustness address both performance and safety, critical factors for next-generation power systems.The researchers believe their findings could reshape how the world builds energy storage systems. “This research goes beyond a single material; it defines a new design rule for building safe, durable, and high-energy batteries that can truly power the future,” Prof. Jung said.The fluoride-based design not only boosts energy density but also uses abundant and low-cost materials, aligning with global efforts to develop carbon-neutral energy systems.As industries move toward electrification and renewable storage, such breakthroughs could accelerate the transition to cleaner, more resilient technologies.The study, which marks a major step toward commercializing high-voltage solid-state batteries, was published in Nature Energy.
Electric Vehicles Energy Storage Fluoride Electrolyte High-Voltage Battery Nature Energy Solid-State Batteries Yonsei University
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