Polyethylene Imine Crosslinked Sodium Alginate Binder for Micro-Silicon/Graphite Composite Anodes. Issue 10 (1st October 2022)

• Record Type: Journal Article
• Authors: Fox, Alina M.; Niesen, Stefan; Du, Qian; Keim, Noah; Vrankovic, Dragoljub; Buchmeiser, Michael R.
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 10(2022)
• Publication Date: 2022-10-01
• Subjects: Batteries - Lithium -- Electronic interfaces -- Energy Storage -- Silicon -- Surface modification; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac9556
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Commercialization of silicon anodes remains a challenge due to severe volume changes during cycling. In this study, a novel binder was synthesized via in situ crosslinking of sodium alginate (NaA) and poly(ethylene imine) (PEI) and used in micro-silicon/graphite composite anodes. Ball milled silicon possesses an increased hydrophilic character, which leads to poor compatibility with graphite in composite anodes using a standard NaA binder. However, the addition of PEI to NaA led to an increase in the specific capacity of ∼1000 mAh/gSi, which can be traced back to the increased compatibility between silicon and graphite induced by a crosslinked binder structure.