講演情報
[9p-C310-15]Interfacial Adhesion and Peel Mechanics of Oxalic-Acid-Modified Silicon Anodes for Lithium-Ion Batteries
〇(M2)Miraflor Linsagan Yap1,2, Henrilen Cubio1,2, Montawat Wiboon2, Maria Carla Manzano1, Jye-Tsung Lee2 (1.De La Salle Univ., 2.National Sun Yat-Sen Univ. Chemistry Lab.)
キーワード：
Silicon anode、Oxalic acid modification、Interfacial adhesion
Silicon is a promising anode material for lithium-ion batteries due to its high theoretical capacity (~4,200 mAh/g). However, its practical application is limited by weak adhesion between the silicon electrode and the copper current collector, leading to electrode delamination and capacity fading during cycling. This study investigates the interfacial adhesion of oxalic-acid-modified silicon anodes prepared via slurry casting with oxalic acid (OA) concentrations of 0.05, 0.10, and 0.20 wt%.Water contact angle measurements show that the pristine electrode has a contact angle of 64.3°, which decreases to 52.7°, 49.4°, and 45.5° with increasing OA content, indicating improved wettability and a more hydrophilic surface. Adhesion was evaluated using 180° peel tests with two adhesive tapes, 3M 618 and 3M 3039. For both tapes, the highest peeling force was observed at 0.05 wt% OA, increasing from 11.06 N to 13.16 N (3M 618) and from 20.33 N to 20.63 N (3M 3039). This improvement aligns with enhanced wettability at low OA content, while higher OA concentrations reduce peeling force, suggesting weakened electrode structure.FTIR and contact angle analysis of the tapes reveal differences in adhesive chemistry. Both tapes use rubber-based adhesives, but 3M 3039 shows ester-related features and higher hydrophobicity than 3M 618. These differences affect peeling behavior and failure modes. Post-peeling observations for 3M 618 show more electrode material transfer, consistent with mixed cohesive–interfacial failure. In contrast, 3M 3039 exhibits higher peeling forces and adhesive transfer from the tape, indicating stronger tape-controlled adhesion. Overall, results show that adhesion performance depends not only on OA concentration and wettability but also on tape adhesive properties.