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Crosslinked Polyimide and Reduced Graphene Oxide Composites as Long Cycle Life Positive Electrode for Lithium‐Ion Cells
Author(s) -
Gao Hui,
Tian Bingbing,
Yang Haofan,
Neale Alex R.,
Little Marc A.,
Sprick Reiner Sebastian,
Hardwick Laurence J.,
Cooper Andrew I.
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202001389
Subject(s) - polyimide , graphene , materials science , oxide , lithium (medication) , composite number , electrode , composite material , electrochemistry , polymer , condensation polymer , redox , chemical engineering , polymer chemistry , chemistry , nanotechnology , layer (electronics) , endocrinology , engineering , metallurgy , medicine
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 .