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2025 Vol.35, Issue 11 Preview Page

Research Paper

Design of Conductive Network through the Hybrid Application of Super P and Multi-Walled Carbon Nanotube in Thick LiFePO4 Electrodes

LFP 후막전극에 Super P와 MWCNT의 복합 적용을 통한 전도성 네트워크 설계

Hyeong-Rae Kim1
,
Myeong-Hun Jo1
,
Hyo-Jin Ahn1†
김 형래1
,
조 명훈1
,
안 효진1†
1Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
1서울과학기술대학교 신소재공학과
†Corresponding author E-Mail : hjahn@seoultech.ac.kr (H.-J. Ahn, SEOULTECH)
27 November 2025. pp. 556-566
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Abstract

Enhancing the energy density of electrodes by increasing thickness and mass loading is a technological challenge. Thick electrodes suffer from severe deterioration in electrochemical performance due to insufficient structural integrity and sluggish charge transport, particularly under high current density. Herein, we fabricated thick LiFePO4 (LFP) electrodes with thicknesses ranging from 85.7 to 90.3 µm and an average mass loading of 17.68 mg/cm2 by tailoring the ratio of zero-dimensional (Super P, SP) and one-dimensional (multi-walled carbon nanotube, MWCNT) conductive additives. The electrodes containing MWCNT exhibited crack-free structure and enhanced electrochemical performance with increasing MWCNT ratio because of the superior mechanical properties and electrical conductivity of MWCNT. However, the electrochemical performance of the electrode containing only MWCNT deteriorated due to aggregation of the MWCNT and poor point to point contact with the LFP particles. The multi-dimensional conductive additives improve the dispersion of components within the electrode and the structural stability of the electrode. As a result, the tailored electrode exhibited a lower degree of electrode thickness expansion (1.4 %), lower polarization (60.8 mV at 0.1 C), excellent high-rate capability (132.7 mAh/g at 2 C), superior capacity retention (27.5 % at 3 C), and lower electrical resistivity and interfacial resistance (14.9 Ω cm and 3.8 Ω cm2, respectively) compared to other samples.

Keywords
lithium-ion batteries
conductive additive
LiFePO4
thick electrode
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 35
  • No :11
  • Pages :556-566
  • Received Date : 2025-10-14
  • Revised Date : 2025-11-07
  • Accepted Date : 2025-11-07
  • DOI :https://doi.org/10.3740/MRSK.2025.35.11.556
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