Insight into ion dynamics in a NaClO4-doped polycaprolactone solid polymer electrolyte for solid state batteries

Supriya K Shetty; Ismayil; Pradeep Nayak; Y N Sudhakar; Kuldeep Mishra; Shahid Bashir; Ramesh Subramaniam

doi:10.1039/d4cp01360c

Insight into ion dynamics in a NaClO₄-doped polycaprolactone solid polymer electrolyte for solid state batteries

Phys Chem Chem Phys. 2024 Sep 19. doi: 10.1039/d4cp01360c. Online ahead of print.

Authors

Supriya K Shetty¹, Ismayil¹, Pradeep Nayak¹, Y N Sudhakar², Kuldeep Mishra³, Shahid Bashir⁴, Ramesh Subramaniam⁵

Affiliations

¹ Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India. ismayil.mit@manipal.edu.
² Department of Chemistry, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India.
³ Symbiosis Institute of Technology, Symbiosis International (Deemed University), Pune, Maharashtra 412115, India.
⁴ Higher Institution Centre of Excellence (HICoE), UM Power Energy Dedicated Advanced Centre (UMPEDAC), Level 4, Wisma R&D, Universiti Malaya, Jalan Pantai Baharu, 59990 Kuala Lumpur, Malaysia.
⁵ Centre for Ionics Universiti Malaya, Department of Physics, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.

PMID: 39295593
DOI: 10.1039/d4cp01360c

Abstract

Employing low T_g polymers has fundamental limitations in providing the desirable ionic conductivity at ambient temperature due to the freezing of chain dynamics. The stiffening of polymer chains and the formation of highly ordered systems due to the crosslinks have influenced the ionic conductivity. Ionic conductivity of 1.02 × 10^-5 S cm^-1 was attained for the system that presented a quantum mechanical tunnelling mode of ion transport. A Na-ion transference number of 0.31 was achieved for 30 wt% of NaClO₄ salt in a polycaprolactone (PCL) matrix with an electrochemical stability window of 3.6 V at 25 °C. High crystallinity and limited availability of free Na⁺ ions in the electrolyte have resulted in lower ionic conductivity. PCL-NaClO₄ exhibited brilliant thermal stability and mechanical properties. The influence of cathode materials MnO₂, V₂O₅ and I₂ on the discharge characteristics of an electrochemical cell in the configuration cathode |(70 wt%)PCL-NaClO₄(30 wt%)|Na has been studied.