# Design and Characterization of Epoxy/Graphite Flake Composites for Enhanced Electrical Conductivity and Electrochemical Performance in Energy Storage Applications

## TL;DR

This paper studies how adding graphite flakes to epoxy affects electrical conductivity and energy storage performance, finding an optimal range of 50-70% graphite for best results.

## Contribution

The study identifies the optimal graphite flake loading (50-70%) for maximizing conductivity and electrochemical performance in epoxy composites.

## Key findings

- Composites with 50-70% graphite flake loading showed highest specific capacitance and cyclic stability.
- Filler loadings above 70% caused agglomeration and reduced conductivity.
- Quantum-mechanical tunneling was the dominant charge transfer mechanism across temperature ranges.

## Abstract

This study presents a comprehensive investigation of the electrical, structural, and electrochemical properties of graphite flake (GF)-reinforced epoxy composites for energy storage applications. Epoxy/GF composites with filler loadings of 10, 30, 50, 70, and 80% wt. were fabricated to evaluate the effect of graphite concentration on conductivity, charge storage, and structural integrity. Impedance spectroscopy demonstrated that quantum-mechanical tunneling, consistent with fluctuation-induced tunneling transport, predominates charge transfer over a wide temperature range, ensuring strong electrical performance. The results show that at 10–30% wt.% GFs, incomplete conductive networks and limited electron and ion transport reduce electrochemical performance. At 50–70% wt.% GFs, the composites exhibited the highest specific capacitance and excellent cyclic stability due to the formation of well-connected three-dimensional conductive networks with sufficient porosity for efficient ion diffusion and charge transport. At filler loadings above 70 wt.%, graphite agglomeration, pore blockage, and microstructural defects were observed, resulting in reduced conductivity and capacitance. SEM, FTIR, and XRD analyses confirmed optimal chemical and morphological interactions at moderate filler contents, highlighting structural degradation at excessive loadings. These results indicate that an optimal graphite content of 50–70% by weight balances conductive pathways, mechanical stability, and electrolyte accessibility, providing a blueprint for designing epoxy/graphite composites that are robust and efficient for next-generation energy storage devices.