Crosslinked polyimide and reduced graphene oxide composites as long cycle life positive electrode for lithium-ion cells

Gao, Hui and Tian, Bingbing and Yang, Haofan and Neale, Alex R. and Little, Marc A. and Sprick, Reiner Sebastian and Hardwick, Laurence J. and Cooper, Andrew I. (2020) Crosslinked polyimide and reduced graphene oxide composites as long cycle life positive electrode for lithium-ion cells. ChemSusChem, 13 (20). pp. 5571-5579. ISSN 1864-564X (https://doi.org/10.1002/cssc.202001389)

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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.

  • Item type:Article
    ID code:73855
    Dates:
    Date
    Event
    21 October 2020
    Published
    29 July 2020
    Published Online
    24 July 2020
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:15 Sep 2020 15:26
    Last modified:09 Apr 2024 01:47
    URI:https://strathprints.strath.ac.uk/id/eprint/73855
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