Water-Soluble Polymer as a Conductive Coat Agent for Rechargeable Lithium-Ion Battery Anodes

概要

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Attaching the active material layer to the aluminum current collector by a conductive-coating layer lowers the interfacial resistance and improves the charging and discharging characteristics of rechargeable lithium-ion batteries. We have discovered that the resistance decreases by using a binder, which has been crosslinked by the esterification of a hydroxyl-group water-soluble polymer and polycarboxylic acid. In this study, we probed the relationship between the physical properties of the binder used in the conductive-coating materials and the properties of the batteries to explore the causes of the reduction of the resistance. The results of this investigation revealed that, owing to the contraction stress that accompanies binder drying and dehydration, conductive carbon particles break through the insulation film that exists on the surface of aluminum current collectors. Furthermore, because the binder inhibits the mutual exchange reaction between lithium and aluminum, a void is created on the interface, which prevents battery deterioration.
The Society of Polymer Science, Japanの論文