Copolymer Solid-State Electrolytes for 3D Microbatteries via Initiated Chemical Vapor Deposition

By Li, Wenhao; Bradley, Laura C.; Watkins, James J.
Published in ACS Applied Materials & Interfaces 2019

Abstract

Reliable integration of thin film solid-state polymer electrolytes (SPEs) with 3D electrodes is one major challenge in microbattery fabrication. We used initiated chemical vapor deposition (iCVD) to produce a series of nanoscale copolymer films comprising hydroxyethyl methacrylate and ethylene glycol diacrylate. Conformal copolymer coatings were applied to a variety of patterned 3D electrodes and subsequently converted into ionic conductors by lithium salt doping. Broad tunability in ionic conductivity was achieved by optimizing the copolymer cross-linking density and matrix polarity, resulting in a room-temperature conductivity of (6.1

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