| 초록 |
Silicon (Si) has attracted great attention as a high-capacity anode material in Li-ion batteries due to its high theoretical specific capacity of 4,200 mAh g-1 for Li4.4Si. However, the silicon anode materials suffer from the substantial volume changes (~400%) during lithiation/delithiation. In this study, new cross-linked polysaccharide binders condensed with polyacrylic acid (PAA) were designed for high performance Si alloy/graphite composite anodes. For the new cross-lined binders, polysaccharide binders such as sodium carboxymethyl cellulose (CMC), guar gum (GG), alginate (Alg), and xanthan gum (XG) were used. The cross-linked polymeric binders with three-dimensionally interconnected network exhibited improved performance on Si alloy/graphite anodes with high loading (5 mg cm-2) and high packing density (1.5 g cm-3). Among the binders, the c-PAA-GG binder showed the best cyclic performance and the adhesion strength and the thickness changes of the electrodes were also compared. |
