A mechanically robust and highly ion-conductive polymer-blend coating for high-power and long-life lithium-ion battery anodes

Abstract

A mechanically robust and ion-conductive polymeric coating containing two polymers, polyethylene glycol tert-octylphenyl ether and poly(allyl amine), with four tailored functional groups is developed for graphite and graphite-Si composite anodes. The coating, acting as an artificial solid electrolyte interphase, leads to remarkable enhancement in capacity reversibility and cycling stability, as well as a high-rate performance of the studied anodes.

Keywords: Li-ion battery; Si anode; artificial solid electrolyte interphase; graphite anode; polymer coating.