Enhanced Thermal Stability and Conductivity of FeF3 Using Ni-Coated Carbon Composites: Application as High-Temperature Cathodes in Thermal Batteries

Author:

Choi Ji-Hyeok1ORCID,Kim Su Hyeong1,Kang Ha Eun1,Kim Minu2,Choi Yusong23,Yoon Young Soo1ORCID

Affiliation:

1. Department of Materials Science & Engineering, Gachon University, Seongnam 13120, Republic of Korea

2. Defense Materials and Energy Development Center, Agency for Defense Development, Daejeon 34060, Republic of Korea

3. Department of Defense System Engineering, University of Science and Technology, Daejeon 34113, Republic of Korea

Abstract

Cathode active materials and conductive additives for thermal batteries operating at high temperatures have attracted research interest, with a particular focus on compounds offering high thermal stability. Recently, FeF3 has been proposed as a candidate for high-voltage cathode materials; however, its commercialization is hindered by its low conductivity. In this study, conductive additives, such as Ni-coated carbon composites (multi-walled carbon nanotubes (MWCNTs) and carbon black (CB)), were utilized to enhance the thermal stability and conductivity of FeF3. The incorporation of metal–carbon conductive additives in the FeF3 composite increased the thermal stability by more than 10 wt.% and ensured high capacity upon conductivity enhancement. The FeF3@Ni/MWCB 15 wt.% composite containing 30 wt.% Ni exhibited a discharge capacity of ∼86% of the theoretical capacity of 712 mAh/g. The use of Ni-coated carbon-based conductive additives will allow the application of FeF3 as an effective high-temperature cathode material for thermal batteries.

Funder

Agency for Defense Development

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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