Key Takeaways
- Researchers at KIMS and KERI have created Korea’s first PTFE‑free dry‑electrode technology using shape‑controlled graphite granules.
- The new process replaces the fluorinated PTFE binder with a widely used CMC‑SBR system and engineers graphite particles into isotropic, randomly oriented granules via spray‑drying.
- This microstructure provides multidirectional Li‑ion transport pathways, mitigating the performance loss seen in thick dry electrodes.
- Laboratory tests show superior fast‑charging capability, long‑term cycling stability, and enhanced lithium‑ion diffusion compared with conventional wet‑processed anodes.
- The technology promises longer electric‑vehicle (EV) driving ranges, quicker charging, lower manufacturing costs, and reduced carbon emissions, while being readily scalable for mass production.
Background and Motivation for Dry‑Electrode Innovation
The rapid growth of electric vehicles and stationary energy‑storage systems has intensified the demand for batteries that combine high energy density with fast charging and long life. Dry‑electrode manufacturing, which eliminates or greatly reduces the use of organic solvents and energy‑intensive drying steps, is viewed as a promising route to cut production costs and carbon footprints. However, most existing dry‑electrode approaches depend heavily on polytetrafluoroethylene (PTFE) as a binder to hold electrode constituents together. PTFE’s performance can degrade in the anode environment, and its fluorinated nature raises environmental and recycling concerns. Consequently, developing a high‑performance, PTFE‑free dry electrode has become a critical challenge for next‑generation battery production.
Overcoming the PTFE Limitation with a CMC‑SBR Binder System
The research team led by Jihee Yoon (KIMS) and Insung Hwang (KERI) addressed the PTFE drawback by substituting it with a carboxymethyl cellulose–styrene‑butadiene rubber (CMC‑SBR) binder blend. CMC‑SBR is already a standard binder in conventional wet‑electrode fabrication, offering proven adhesion, electrochemical stability, and compatibility with existing manufacturing lines. By incorporating this binder into a dry‑process slurry, the scientists eliminated the need for fluorinated materials while retaining the mechanical integrity required for electrode integrity.
Design and Fabrication of Shape‑Controlled Graphite Granules
To achieve effective electrode architecture without PTFE, the team engineered the graphite filler itself. They prepared a slurry containing graphite particles, conductive carbon additives, and the CMC‑SBR binder, then subjected it to a spray‑drying process. During granulation, the normally plate‑like graphite particles assembled into three‑dimensional granules possessing a randomly oriented, isotropic internal structure. Unlike the highly aligned graphite stacks formed in conventional calendaring, these morphology‑engineered granules create Li‑ion transport pathways in multiple directions, including through‑plane routes that traverse the electrode thickness. This design directly counters the orientation‑induced diffusion limitations that typically impair thick dry electrodes during cycling.
Electrochemical Performance: Fast Charging and Cycling Stability
Electrochemical testing revealed that the PTFE‑free dry anode outperformed traditional slurry‑based anodes in several key metrics. The granules enabled rapid lithium‑ion insertion and extraction, resulting in markedly improved fast‑charging rates—demonstrated by high current capability without excessive polarization. Moreover, the cells exhibited excellent long‑term cycling stability, retaining a high percentage of their initial capacity after hundreds of charge‑discharge cycles. The isotropic granule architecture reduced localized stress and prevented the formation of dead‑zone regions that commonly accelerate capacity fade in thick electrodes.
Lithium‑Ion Diffusion and High‑Energy‑Density Viability
Beyond rate capability, the researchers measured lithium‑ion diffusion coefficients under high‑energy‑density conditions. The PTFE‑free dry anode displayed significantly enhanced diffusion characteristics, confirming that the multidirectional pathways effectively alleviate transport bottlenecks. This improvement supports the use of thicker electrode designs, which are essential for boosting gravimetric and volumetric energy density without sacrificing power performance. Thus, the technology bridges the gap between high energy density and high power output—a combination crucial for EVs seeking both extended range and quick replenishment.
Implications for Electric Vehicles, Energy Storage, and Sustainable Manufacturing
The advances position the PTFE‑free dry electrode as a compelling candidate for electric‑vehicle batteries, where longer driving ranges and ultra‑fast charging are market differentiators. Energy‑storage systems for grid applications also stand to benefit from the improved cycle life and safety profile associated with reduced solvent use. Because the CMC‑SBR binder is already entrenched in industry supply chains, scaling the process to gigafactory levels requires minimal retooling. Moreover, the dry process cuts down on volatile organic compound (VOC) emissions and eliminates the energy‑intensive drying ovens used in wet electrode production, translating into lower manufacturing costs and a smaller carbon footprint.
Commercialization Pathway and Supportive Research Infrastructure
The work was carried out under several Korean government‑funded programs, including the KIMS institutional research initiative, the Creative Convergence Research Program of the National Research Council of Science and Technology, and the Materials and Components Technology Development Program funded by the Ministry of Trade, Industry and Energy. The findings were published online on April 21, 2026, in Energy Storage Materials (Impact Factor 20.2), underscoring the scientific rigor and relevance of the contribution. With peer‑review validation and strong institutional backing, the technology is poised for pilot‑scale demonstrations and eventual partnership with battery manufacturers seeking greener, higher‑performing solutions.
Conclusion: A Step Toward Greener, Higher‑Performance Batteries
By replacing PTFE with a widely adopted CMC‑SBR binder and redesigning graphite into morphology‑controlled, isotropic granules, the KIMS/KERI team has solved a longstanding obstacle in dry‑electrode fabrication. The resulting anode delivers superior fast‑charging behavior, enduring cycling stability, and enhanced lithium‑ion transport—key enablers for high‑energy‑density batteries. As the electric‑vehicle market expands and sustainability pressures mount, this PTFE‑free dry‑electrode technology offers a viable pathway to longer driving ranges, faster charging, cleaner production, and broader adoption of next‑generation energy storage systems.