Yonsei University develops a new era of high-voltage solid-state batteries
Researchers develop a groundbreaking fluoride-based solid electrolyte that surpasses voltage limits, unlocking next-generation battery performance
2025-10-31
(Press-News.org)
In a major advancement for energy storage technology, Professor Yoon Seok Jung and his team at Yonsei University have revealed a new fluoride-based solid electrolyte that enables all-solid-state batteries (ASSBs) to operate beyond 5 volts safely. This paper, made available online on October 3, 2025 and was published in the Nature Energy journal, addressed a long-standing barrier in battery science, achieving high voltage stability without sacrificing ionic conductivity. As Prof. Jung explains, “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.”
For decades, battery engineers have sought to enhance energy density by increasing voltage, but conventional solid electrolytes, such as sulfides and oxides, tend to break down above 4 V. The team overcame this limitation by developing a fluoride solid electrolyte (LiCl–4Li2TiF6) that remains stable beyond 5 V and exhibits a Li+ conductivity of 1.7 × 10⁻⁵ S/cm at 30°C, one of the highest in its class. This innovation allows spinel cathodes such as LiNi0.5Mn1.5O4 (LNMO) to operate safely and efficiently, even under demanding cycling conditions. When applied as a protective coating on high-voltage cathodes, LiCl–4Li2TiF6 effectively suppresses interfacial degradation between the cathode and the electrolyte. The result showed a battery that retains over 75% capacity after 500 cycles and supports an ultrahigh areal capacity of 35.3 mAh/cm², a record-setting figure for solid-state systems. The team also demonstrated practical adaptability in pouch-type batteries. This is the same format used in electric vehicles and consumer electronics, showing exceptional performance consistency.
Beyond material innovation, the work lays the foundation for a transformative battery design model. The fluoride-based shield introduced by the researchers not only enhances electrochemical stability but also allows compatibility with cost-effective halide catholytes such as Zr-based systems. This combination could drastically reduce material costs while improving safety and longevity, which are two of the biggest challenges for commercial ASSB technology.
In conclusion, this research holds immense potential—from enabling electric vehicles with longer driving ranges to advancing large-scale renewable energy storage. By utilizing abundant and low-cost materials, it supports the global shift toward sustainable, carbon-neutral energy systems. As Prof. Jung notes, “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.”
This breakthrough represents a significant leap toward cleaner and more resilient energy solutions, bridging the gap between laboratory innovation and real-world applications, and laying the groundwork for the next generation of sustainable technology.
***
Reference
DOI: 10.1038/s41560-025-01865-y
About Yonsei University
Yonsei University, located in Seoul, South Korea, is one of the nation’s oldest and most prestigious private research institutions. Founded in 1885, the university is renowned for academic excellence and its strong commitment to international collaborations and partnerships. Yonsei offers diverse programs across the humanities, sciences, engineering, business, and more, serving approximately 30,000 students with a distinguished faculty. Yonsei remains dedicated to fostering creativity and cultural exchange in a rapidly evolving world.
https://www.yonsei.ac.kr/en_sc/
About the author
Dr. Yoon Seok Jung is a Professor of the Department of Chemical and Biomolecular Engineering at Yonsei University. He received his B.S. and Ph.D. from Seoul National University (2008) and conducted postdoc research at the University of Colorado Boulder, UT Austin, and NREL. His research focuses on advanced materials and cell technologies for rechargeable batteries with a particular emphasis on next-generation solid-state batteries. He has received several academic honors, including appointment as a Yonsei Underwood Distinguished Professor, and also serves as an Associate Editor of ACS Applied Energy Materials.
END
ELSE PRESS RELEASES FROM THIS DATE:
2025-10-31
Low body weight in young women has been linked to a range of health concerns, including disrupted menstrual cycles, infertility, weakened immune function, and a long-term decline in bone density. Japan has seen a rising trend in the proportion of underweight women between the ages of 20 and 39, with little to no change over the past two decades. The persistence of this trend raises concerns over the long-term health implications, especially as lean body weight has been correlated with changing dietary habits, diseases like anorexia nervosa, and even imbalances in gut microbiota. ...
2025-10-31
Astringency is a dry, puckering, rough, or sandpapery sensation in the mouth caused by plant-derived polyphenols. Polyphenols, including flavanols, are well known for risk reduction in cardiovascular diseases. Flavanols, found abundantly in cocoa, red wine, and berries, are associated with improved memory and cognition, as well as protection against neuronal damage. Despite these benefits, flavanols have poor bioavailability—the fraction that actually enters the bloodstream after ingestion. This has left an important knowledge gap: how can flavanols influence brain function and the nervous system when so little of them is absorbed?
In response to this challenge, a research ...
2025-10-31
Sepsis continues to be a leading cause of mortality in ICUs worldwide. Despite advances in early detection and treatment, standardized antibiotic dosing frequently ignores patient-level variability—especially that associated with sex-related physiology and gender-influenced care disparities.
A newly published editorial in the Journal of Intensive Medicine on September 8, 2025, is calling attention to how biological sex and gender inequities contribute to suboptimal sepsis treatment, potentially compromising outcomes for women. Authored ...
2025-10-31
CAMBRIDGE, MA -- Cancer immunotherapy, which uses drugs that stimulate the body’s immune cells to attack tumors, is a promising approach to treating many types of cancer. However, it doesn’t work well for some tumors, including ovarian cancer.
To elicit a better response, MIT researchers have designed new nanoparticles that can deliver an immune-stimulating molecule called IL-12 directly to ovarian tumors. When given along with immunotherapy drugs called checkpoint inhibitors, IL-12 helps the immune system launch an attack on cancer cells.
Studying a mouse model of ovarian cancer, the researchers ...
2025-10-31
A vaccine that tackles the bacteria that cause up to 200 million childhood infections every year could be possible, experts say.
In the first study of its kind, an international team including those at the Wellcome Sanger Institute, the University of Oslo, the University of Oxford and the Shoklo Malaria Research Unit at Mahidol University in Thailand, analysed new and existing Haemophilus influenzae (H. influenzae) genomes, from global samples collected between 1962-2023. H. influenzae is a type of bacteria that can cause a range of infections that are widely treated with antibiotics, but ...
2025-10-31
Protein TDP-43 malfunctions and disrupts the normal splicing of the KCNQ2 gene
Mis-splicing of the gene causes neurons to fire too much, too easily in ALS and FTD
Study authors developed a new drug, which calmed overactive ALS neurons
CHICAGO --- A new Northwestern University study using patient nervous tissue and lab-grown human neurons has uncovered how a key disease protein, TDP-43, drives overactive nerve cells in the neurodegenerative diseases amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD).
The findings not only explain a long-standing mystery of why nerve cells overfire ...
2025-10-31
LAWRENCE — As climate change produces ever more heat waves, how many homes in the U.S. lack adequate cooling? Who’s most vulnerable to lethal temperatures, and exactly where do they live?
A researcher at the University of Kansas has produced the most comprehensive and detailed map of air conditioning usage in the United States — data that can improve the understanding of AC access for public health officials, urban planners, emergency managers, economists, energy auditors, providers of social services, private industry and other stakeholders.
The research appears today in the peer-reviewed journal Scientific ...
2025-10-31
The phrase ‘liquid metal’ may bring to mind something hazardous, like mercury or molten steel. But in the Laboratory of Photonic Materials and Fiber Devices (FIMAP) in EPFL’s School of Engineering, it simply means a mixture of indium and gallium that is nontoxic, remains liquid at room temperature, and shows great promise for developing electronic fibers for wearables and robotic sensors.
Unfortunately, as FIMAP head Fabien Sorin explains, liquid metals are extremely difficult to process, and it’s especially hard to produce electronic fibers that combine high and stable conductivity with stretchability. Now, the lab has overcome this ...
2025-10-31
A spooky bat has been spotted flying over the European Southern Observatory’s (ESO’s) Paranal site in Chile, right in time for Halloween. Thanks to its wide field of view, the VLT Survey Telescope (VST) was able to capture this large cloud of cosmic gas and dust, whose mesmerising appearance resembles the silhouette of a bat.
Located about 10 000 light-years away, this ‘cosmic bat’ is flying between the southern constellations of Circinus and Norma. Spanning an area of the sky equivalent to four full Moons, it looks as if it's trying to hunt the glowing spot above it for food.
This nebula is a stellar nursery, a vast cloud of gas and dust from ...
2025-10-31
Hydrogen peroxide (H2O2) is ranked among the top 100 most important chemicals globally. Currently, the anthraquinone oxidation method is the primary method for industrial H2O2 production, yet it faces several major issues, including complex synthesis, high energy consumption. As a more sustainable and environmentally friendly alternative, the artificial photosynthesis of H2O2 from H2O and O2 using semiconductor photocatalysts driven by renewable solar energy has attracted significant attention. A key process in this approach is the two–electron oxygen reduction reaction (2e- ORR). However, most photocatalysts face limitations, ...
LAST 30 PRESS RELEASES:
[Press-News.org] Yonsei University develops a new era of high-voltage solid-state batteries
Researchers develop a groundbreaking fluoride-based solid electrolyte that surpasses voltage limits, unlocking next-generation battery performance
