Crosslinked Polyimide and Reduced Graphene Oxide Composites as Long Cycle Life Positive Electrode for Lithium-Ion Cells.

ABSTRACT: Conjugated polymers with electrochemically active redox groups are a promising class of positive electrode material for lithium-ion batteries. However, most polymers, such as polyimides, possess low intrinsic conductivity, which results in low utilization of redox-active sites during charge cycling and, consequently, poor electrochemical performance. Here, it was shown that this limitation can be overcome by synthesizing polyimide composites (PIX) with reduced graphene oxide (rGO) using an in?situ polycondensation reaction. The polyimide composites showed increased charge-transfer performance and much larger specific capacities, with PI50, which contains 50?wt?% of rGO, showing the largest specific capacity of 172?mAh?g^-1 at 500?mA?g^-1 . This corresponds to a high utilization of the redox active sites in the active polyimide (86?%), and this composite retained 80?% of its initial capacity (125?mAh?g^-1 ) after 9000 cycles at 2000?mA?g^-1 .

SUBMITTER: Gao H 

PROVIDER: S-EPMC7693101 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature