Researchers from POSTECH and Sogang University have developed a functional polymeric binder for stable, high-capacity anode materials that could increase the range of electric vehicles. The joint team developed a charged polymeric binder for high-capacity anode material, which is both stable and reliable, offering a capacity that is ten times or higher than that of conventional graphite anodes. By replacing graphite with Si anode combined with layering-charged polymers while maintaining stability and reliability. The volume expansion of high-capacity anode materials has threatened battery performance and stability. To mitigate this issue, researchers have been investigating polymer binders that can effectively control the volumetric expansion. The new polymer developed by the research team not only utilises hydrogen bonding but also takes advantage of Coulombic forces, which have a strength of 250 kJ/mol, much higher than hydrogen bonding. These forces are reversible, making it easy to control volumetric expansion. Professor Soojin Park explained that the research holds the potential to significantly increase the energy density of lithium-ion batteries through the incorporation of high-capacity anode materials, thereby extending the driving range of electric vehicles. Silicon-based anode materials could potentially increase driving range at least tenfold.
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