Effect of side chain length and shape on acrylic binders for silicon anodes
발표자
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초록
내용
Acrylic binder is a polymer that play a role in improving the contact between silicon (Si) and lithium ions in the anode of lithium ion batteries. The widely used acrylic binder, polyacrylic acid (PAA) has strong hydrogen bonding between -OH and Si, but it has high glass transition temperature (Tg) and insufficient flexibility, resulting in poor cycling performance and leading to capacity loss of Si anodes. In this study, acrylic binders with low Tg and high flexibility were synthesized by copolymerizing monomers with different side chain lengths (2-ethylhexyl acrylate, butyl acrylate, etc.) with methyl methacrylate (MMA) and methacrylic acid (MAA). The acrylic binders were prepared by water-based emulsion polymerization. To investigate the characteristics of the binders, Tg and thermal stability were measured by DSC and TGA. The adhesion performance of binders were confirmed by 180° peel test and probe tack test. Rheological properties were confirmed by rotational rheometer.