Polyethylene Imine Crosslinked Sodium Alginate Binder for Micro-Silicon/Graphite Composite Anodes

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...

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Published in:Journal of the Electrochemical Society 2022-10, Vol.169 (10), p.100507
Main Authors: Fox, Alina M., Niesen, Stefan, Du, Qian, Keim, Noah, Vrankovic, Dragoljub, Buchmeiser, Michael R.
Format: Article
Language:English
Subjects:
Batteries - Lithium
Electronic interfaces
Energy Storage
Silicon
Surface modification
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description 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/g Si , which can be traced back to the increased compatibility between silicon and graphite induced by a crosslinked binder structure.
doi_str_mv 10.1149/1945-7111/ac9556
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source Institute of Physics
subjects Batteries - Lithium
Electronic interfaces
Energy Storage
Silicon
Surface modification
title Polyethylene Imine Crosslinked Sodium Alginate Binder for Micro-Silicon/Graphite Composite Anodes
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