Journal
SURFACE & COATINGS TECHNOLOGY
Volume 407, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.126797
Keywords
PMDA-ODA polyimide; Core-shell nanowire; Polypyrrole; Multi-walled carbon nanotube; Aqueous rechargeable sodium-ion battery
Funding
- R&D program of Korea Institute of Industrial Technology (KITECH), South Korea
Ask authors/readers for more resources
The study demonstrates the potential applications of sodium-ion batteries, introduces a novel core-shell nanowire structure as a high-capacity and cycling-stable anode material, and improves cycling performance by coating conducting polypyrrole on the surface.
Aqueous rechargeable sodium-ion batteries (ARSBs) have potential applications in large-scale electric energy storage systems because of the non-flammable and fast charge-discharge performance of the aqueous neutral electrolyte as well as low cost and abundance of sodium resources. Herein, we demonstrate polypyrrole-coated MWCNT@polyimide core-shell nanowire based on pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA) as a high-capacity and cycling-stable anode material for ARSBs. The as-synthesized MWCNT@polyimide core-shell nanowire exhibits excellent initial discharge capacity as high as 234.9 mA h g(-1), which is 83.6% of the theoretical value, owing to the bicontinuous electron/ion transport pathway. During 100 cycles of charge-discharge, however, the considerable swelling of PMDA-ODA polyimide and structural degradation of core-shell structure result in significant deterioration in the performance from 234.9 to 74.6 mAh g(-1). In order to improve the cycling stability, conducting polypyrrole is coated on its surface. After 100 charge-discharge cycles, the polypyrrole-coated MWCNT@polyimide core-shell nanowire retains a specific capacity of 209.3 mA h g(-1), corresponding to 77.8% of the initial capacity, without any swelling and structural degradation. In impedance study, the changes in the surface and charge transfer resistances during charge-discharge cycles are significantly reduced. As a result, the polypyrrole layer successfully inhibits the structural degradation of the MWCNT@polyimide core-shell nanowire, and consequently improves the cycling performance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available