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Electrical Conductivity in Graphite Foils Produced by Rolling and Pressing.

Nikolai S Morozov¹, Vladimir A Shulyak¹, Margarita G Isaenkova²

¹Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.

Materials (Basel, Switzerland)

|January 8, 2025

Summary

This study investigated how rolling and pressing affect flexible graphite foil conductivity. Optimized calculations revealed that micro-strains and secondary phases decrease conductivity, while texture sharpness influences anisotropy.

Keywords:

compacting crystallographic texture electrical conductivity flexible graphite foil rolling structural parameters the Kearns texture parameters

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Area of Science:

Materials Science
Condensed Matter Physics

Background:

Flexible graphite foils (GFs) are utilized in various applications requiring good electrical properties.
The manufacturing process significantly influences the microstructure and properties of GFs.
Understanding structure-property relationships is crucial for optimizing GF performance.

Purpose of the Study:

To investigate the factors influencing the electrical conductivity of flexible graphite foils (GFs).
To examine the relationship between electrical conductivity, texture, and structure in GFs produced by rolling or pressing.
To correlate texture sharpness and substructural characteristics with electrical conductivity anisotropy.

Main Methods:

Comparative analysis of GFs produced by rolling versus pressing.
Microstructural characterization to assess texture and substructure.
Measurement and analysis of electrical conductivity in different directions.
Application of Kearns texture parameters for conductivity calculation.

Main Results:

Electrical conductivity is significantly impacted by the forming process (rolling or pressing).
A correlation exists between texture sharpness, electrical conductivity anisotropy, and substructural features.
Increased micro-strains and the presence of a secondary phase substructure were found to reduce conductivity.
Optimized electrical conductivity calculations were achieved by incorporating foil structural characteristics.

Conclusions:

The forming method critically determines the electrical conductivity and anisotropy of flexible graphite foils.
Microstructural features, including texture and substructure, are key determinants of GF electrical performance.
The study provides a framework for optimizing GF production for specific electrical conductivity requirements.