Incorporation of aniline tetramer into alginate-grafted-polyacrylamide as polymeric binder for high-capacity silicon/graphite anodes

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2022-04, Vol.433, p.133553, Article 133553
• Main Authors: Gendensuren, Bolormaa, Sugartseren, Nyambayar, Kim, Moongi, Oh, Eun-Suok
• Format: Article
• Language: English
• Subjects: Acrylamide; Aniline tetramer; Graft copolymer; Graphite; Silicon
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.133553

[Display omitted] •Water-soluble copolymer binder with conductive aniline-oligomers is synthesized.•Alg-g-PAMAT binders exhibit stable cyclic capacity due to their good conductivity.•The balance between adhesion and conductivity is determined on Alg-g-PAMAT binder.•An optimized Alg-g-PAMAT binder helps to deliver a high capacity of 701.2 mAh g−1. Progress in the performance of high-capacity silicon anodes has been made with a variety of material designs. In this study, a new design on polymeric binder is proposed for the high-capacity anodes. The effective addition of conductive aniline oligomers to adhesive alginate-graft-polyacrylamide binder improves the performance of the silicon/graphite composite electrodes. To do this, three-step in situ polymerization is adopted to synthesize adhesive and conductive alginate-graft-poly(acrylamide-co-acrylamide aniline tetramer). A small amount of aniline tetramer added to the binder, of 1.25 wt%, is enough to enhance electronic and ionic transport through the silicon-based anode, while maintaining electrode adhesion. Consequently, the silicon/graphite electrode containing the alginate-graft-poly(acrylamide-co-acrylamide aniline tetramer) binder shows 701.2 mAh g−1 after 200 cycles with excellent cyclic stability. This is significantly greater performance than that of the commercial graphite electrodes.