Role of redox additive modified electrolytes in making Na-ion supercapacitors a competitive energy storage device

TL;DR

This paper demonstrates that redox additive modified electrolytes significantly enhance Na-ion supercapacitor performance, especially when combined with hollow nanostructures and NaFePO4 cathodes, making them competitive energy storage devices.

Contribution

It introduces the use of redox additive modified electrolytes with NaFePO4 cathodes and hollow nanostructures to improve Na-ion supercapacitor performance.

Findings

Performance improved by 50% with redox additive

NaFePO4 offers high electrochemical potential and stability

Redox additive makes Na-ion supercapacitors competitive

Abstract

The study shows the importance of moving towards hollow nanostructures for obtaining next-generation supercapacitors and batteries. Amongst various sodium-based electrode materials, NaFePO4 is one of the most promising cathodic material because of its high electrochemical potential, structural, and thermal stability. To use this material in high performance Na-ion based energy storage device, it is imperative to combine it with a suitably optimized carbon structures and a redox additive modified electrolyte. This strategy is unequivocally established in the paper. On addition of redox additive, the performance can be improved by 50%. This makes the Na-ion supercapacitor competitive with other metal ion based systems. the performance by as high as 50%. This makes the Na-ion supercapacitors competitive with other metal ion based systems.