Revolutionary battery technology to boost EV range 10-fold or more

(Nanowerk News) As the EV market is witnessing skyrocketing growth, there is a surging demand for high-capacity batteries to enhance EV driving range. A joint research team from POSTECH and Sogang University has developed a functional polymeric binder for a stable, high-capacity anode material, promising a 10-fold increase in EV range.
Led by Professors Soojin Park (Chemistry) and Youn Soo Kim (Materials Science and Engineering) from POSTECH and Professor Jaegeon Ryu (Chemical and Biomolecular Engineering) from Sogang University, the team created a charged polymeric binder for a high-capacity, stable, and reliable anode material. This was accomplished by replacing graphite with a silicon (Si) anode combined with layering-charged polymers, ensuring stability and reliability.
The research was featured as the Front Cover Article in Advanced Functional Materials ("Layering charged polymers enable highly integrated high-capacity battery anodes").
Graphical abstract of this research
Graphical abstract of this research.
High-energy-density Li-ion batteries require high-capacity anode materials like silicon, which can offer a capacity 10 times greater than graphite or other existing anode materials. However, the volume expansion of high-capacity anode materials during lithium interaction compromises battery performance and stability. Researchers have been exploring polymer binders to effectively control volumetric expansion.
Previous research primarily focused on chemical crosslinking and hydrogen bonding. Chemical crosslinking forms solid covalent bonds between binder molecules, but once broken, they cannot be restored. Hydrogen bonding is a reversible secondary bonding based on electronegativity differences, but its strength (10-65 kJ/mol) is relatively weak.
The new polymer leverages hydrogen bonding and Coulombic forces (attraction between positive and negative charges), which have a strength of 250 kJ/mol, much higher than hydrogen bonding, and are reversible for easy volumetric expansion control. The layering-charged polymers, with alternating positive and negative charges, effectively bind with the negatively charged surface of high-capacity anode materials. The team also introduced polyethylene glycol to regulate physical properties and facilitate Li-ion diffusion, resulting in a thick high-capacity electrode and maximum energy density in Li-ion batteries.
Professor Soojin Park remarked, "This research could significantly increase Li-ion batteries' energy density by incorporating high-capacity anode materials, extending the driving range of EVs. Silicon-based anode materials have the potential to boost driving range by at least ten times."
Source: Pohang University of Science & Technology (POSTECH) (Note: Content may be edited for style and length)
We curated a list with the (what we think) best greentech, sustainability and environmentalism podcasts - check them out!