The rational design of a redox-active mixed ion/electron conductor as a multi-functional binder for lithium-ion batteries?

Journal of Materials Chemistry A Pub Date: 2021-01-19 DOI: 10.1039/D0TA08913C

Abstract

A redox-active mixed ion and electron conductor (redox-active MIEC) is presented as a binder for the lithium titanate anodes of lithium-ion batteries. The redox-active MIEC binder (symbolized by PT*-GmCn) was designed to be (1) electrically conductive along its conjugated thiophene backbone (PT = polythiophene), (2) redox-active from its succinimide moiety (* = redox-active) and (3) ionically conductive by adopting glyme (G) branches. It was superior to the practically used PVdF binder in terms of lithium ion diffusivity and electrical conductivity (1.4× and 15?000×, respectively). High capacity was guaranteed, particularly at high rates due to its MIEC nature of PT*-GmCn, while an additional capacity was achieved from its redox activity.

Graphical abstract: The rational design of a redox-active mixed ion/electron conductor as a multi-functional binder for lithium-ion batteries
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