Zhongfan Jia

 

Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane QLD 4072, Australia

 

Redox active polymers especially nitroxide radical polymers are of great interests in energy storage applications due to their high stability at ambient condition, reversible one-electron transfer and high electrochemical reaction constant, charge exchange rate1. Molecular design of nitroxide radicals and their polymers, as well as microstructure of electrode composites have been recognized playing an important role in their final battery performance2. This work studies nitroxide radical structure, molecular weight of polymer and their composite structure effects on electrochemical performance.

Over 20 nitroxide radicals with different structures were synthesized and their redox behaviour is studied. It is found that the substitution and heteroatoms can affect not only the redox potential but also the reversibility of the redox reaction as shown in Figure 1.

Polymer containing nitroxide radicals were synthesized through a single-electron transfer-living radical polymerization (SET-LRP). These polymers were further functionalized formed electrode composites by a non-covalent interaction with reduced graphene oxide (rGO). Figure 2 showed the molecular weight effect on the cell capacity and cycleability. It can be seen that with the increasing of molecular weight of PTMA, the cell capacity in a lithium battery increased. This is due to the PTMA with high molecular weight has low solubility in electrolyte solution3.

References

  1. H. Nishide and K. Oyaizu, Science, 319, 737, (2008).
  2. T. Janoschka, M. D. Hager and U. S. Schubert, Adv. Mater. 24, 6397, (2012).K. Zhang, Y.X. Hu, L. Z. Wang, M. J. Monteiro, Z. F. Jia, Polym. Chem. 8, 1815, ( 2017)

Biographic Details

Name Zhongfan Jia

Title: ARC Future Fellow and Associate Group Leader

Affiliation, Country: The University of Queensland, Australia

Phone: +61 7 3346 4163 E-mail: z.jia@uq.edu.au

Research interests: Polymer Chemistry, Polymer for Energy Storage