TY - JOUR
T1 - Crosslinked Polyimide and Reduced Graphene Oxide Composites as Long Cycle Life Positive Electrode for Lithium-Ion Cells
AU - Gao, Hui
AU - Tian, Bingbing
AU - Yang, Haofan
AU - Neale, Alex R.
AU - Little, Marc A.
AU - Sprick, Reiner Sebastian
AU - Hardwick, Laurence J.
AU - Cooper, Andrew I.
N1 - Funding Information:
We thank the Engineering and Physical Sciences Research Council (EPSRC) for financial support under grant EP/N004884/1. LJH and ARN acknowledge the EPSRC funding under grant EP/R020744/1. HG thanks the CSC for a scholarship. The authors thank Dr. Michael Briggs for valuable discussions.
Publisher Copyright:
© 2020 The Authors. Published by Wiley-VCH GmbH
PY - 2020/7/29
Y1 - 2020/7/29
N2 - 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.
AB - 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.
KW - Cathode
KW - composites
KW - crosslinked polyimides
KW - lithium-ion batteries
KW - long cycle life
U2 - 10.1002/cssc.202001389
DO - 10.1002/cssc.202001389
M3 - Article
C2 - 32725860
AN - SCOPUS:85090090416
SN - 1864-5631
VL - 13
SP - 5571
EP - 5579
JO - ChemSusChem
JF - ChemSusChem
IS - 20
ER -
