Radical-Scavenging Activatable and Robust Polymeric Binder Based on Poly(acrylic acid) Cross-Linked with Tannic Acid for Silicon Anode of Lithium Storage System

Abstract

The design of a novel binder is required for high-capacity silicon anodes, which typically undergo significant changes during charge/discharge cycling. Hence, in this study, a stable network structure was formed by combining tannic acid (TAc), which can be cross-linked, and poly(acrylic acid)(PAA) as an effective binder for a silicon (Si) anode. TAc is a phenolic compound and representative substance with antioxidant properties. Owing to the antioxidant ability of the C-PAA/TAc binder, side reactions during the cycling were suppressed during the formation of an appropriate solid–electrolyte interface layer. The results showed that the expansion of a silicon anode was suppressed compared with that of a conventional PAA binder. This study demonstrates that cross-linking and antioxidant capability facilitate binding and provides insights into the behavior of binders for silicon anodes. The Si anode with the C-PAA/TAc binder exhibited significantly improved cycle stability and higher Coulombic efficiency in comparison to the Si anode with well-established PAA binders. The C-PAA/TAc binder demonstrated a capacity of 1833 mA h g−1Si for 100 cycles, which is higher than that of electrodes fabricated using the conventional PAA binder. Therefore, the C-PAA/TAc binder offers better electrochemical performance.

In Situ Prepared Three-Dimensional Covalent and Hydrogen Bond Synergistic Binder to Boost the Performance of SiOx Anodes for Lithium-Ion Batteries

“…All the above results demonstrate that the 3D network of PAA-Dex 9 is the most stable during the charge/discharge process, guaranteeing the best transportation of lithium ions in the anode, accommodating the volume change during cycling, and improving the long-term cycling capacity of SiO x @PAA-Dex 9 . 62,63 Table S2 shows the detailed impedance parameters of the electrodes based on the different binders after 300 cycles.…”

Research progress of robust binders with superior mechanical properties for high-performance silicon-based lithium-ion batteries

“…Therefore, researchers mostly use in situ thermal crosslinking, in situ optical crosslinking, or direct polymerization to form a network polymer in the electrode. [96][97][98] Typically, there exist abundant hydroxyl and trace SiO 2 on the surface of Si-nanoparticles by residual or hydrolyzation, which makes it possible to acquire a strong hydrogen binding effect with those binders with -OH, -COOH, or similar groups with strong adhesion. These binders mainly include polar oxygenated polymers, such as poly(acrylic acid) (PAA), guar gum, alginate (Alg), and carboxymethylcellulose (CMC).…”

“…Therefore, researchers mostly use in situ thermal crosslinking, in situ optical crosslinking, or direct polymerization to form a network polymer in the electrode. 96–98…”