Sulfur-Free Expanded Graphite/Paraffin Composite Phase Change Material with High Thermal Conductivity for Lithium-Ion Battery Thermal Management

  • ZHANG Xinyi ,
  • HUO Jinghao ,
  • YUAN Xiaoyan ,
  • ZHENG Min ,
  • GUO Shouwu
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  • 1. School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Institute of Frontier Science and Technology Transfer, Shaanxi University of Science and Technology, Xi’an 710021, China
    2. School of Photoelectric Engineering, Changzhou Institute of Technology, Changzhou 213002, China
    3. Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

网络出版日期: 2025-07-04

基金资助

The authors appreciate the financial support of the Scientific Research Program Funded by Shaanxi Provincial Education Department (23JK0354) and the National Natural Science Foundation of China (52272302).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Sulfur-Free Expanded Graphite/Paraffin Composite Phase Change Material with High Thermal Conductivity for Lithium-Ion Battery Thermal Management

  • ZHANG Xinyi ,
  • HUO Jinghao ,
  • YUAN Xiaoyan ,
  • ZHENG Min ,
  • GUO Shouwu
Expand
  • 1. School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Institute of Frontier Science and Technology Transfer, Shaanxi University of Science and Technology, Xi’an 710021, China
    2. School of Photoelectric Engineering, Changzhou Institute of Technology, Changzhou 213002, China
    3. Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Online published: 2025-07-04

Supported by

The authors appreciate the financial support of the Scientific Research Program Funded by Shaanxi Provincial Education Department (23JK0354) and the National Natural Science Foundation of China (52272302).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

摘要

石蜡(PA)是一种常见的相变材料,因其潜热和温度均匀性高、系统结构简单、不增加电池能耗而广泛应用于电池热管理系统(BTMS)。在这项工作中,无硫膨胀石墨(EG)在氧化插层制备过程中不使用H2SO4,避免了S元素对器件的危害。无硫EG具有324 mL g-1的高膨胀体积,可以很好地吸附PA以防止泄漏。当EG的填充率为5.0 wt.%时,EG/PA-5.0复合薄膜显示出较高的相变潜热(253.08 J g-1)和导热系数(2.56 W m-1 K-1)。将EG/PA薄膜附着在磷酸铁锂电池的外表面上,用于散热性能测试。当室温下放电速率为1C时,EG/PA-5.0薄膜电池的表面温度和测温点之间的最大温差分别为32.1°C和1.2°C 。在1C下充放电100次后,EG/PA的热性能基本保持不变,具有良好的循环稳定性。模拟结果与电池在不同放电速率下的实际温度变化非常吻合。这项工作表明,无硫EG/PA复合材料在动力电池的BTMS中具有良好的应用前景。

本文引用格式

ZHANG Xinyi , HUO Jinghao , YUAN Xiaoyan , ZHENG Min , GUO Shouwu . Sulfur-Free Expanded Graphite/Paraffin Composite Phase Change Material with High Thermal Conductivity for Lithium-Ion Battery Thermal Management[J]. 热科学学报, 2025 , 34(4) : 1287 -1300 . DOI: 10.1007/s11630-025-2140-3

Abstract

Paraffin (PA) is a common phase change material, which is widely used in battery thermal management systems (BTMS) because of its high latent heat and temperature uniformity, simple system structure, and no increase in battery energy consumption. In this work, sulfur-free expanded graphite (EG) is prepared by oxidation intercalation without H2SO4 in the preparation process, which avoids the harm to devices caused by the S element. The sulfur-free EG exhibits a high expanded volume of 324 mL·g–1, which can adsorb PA well to prevent leakage. When the mass filling ratio of EG is 5.0%, EG/PA-5.0 composite films show high latent heat of phase transition (253.08 J·g–1), and thermal conductivity (2.56 W·m–1·K–1). EG/PA films are attached to the external surface of the lithium iron phosphate battery for a heat dissipation performance test. When the discharge rate is 1C at room temperature, the surface temperature and maximum temperature difference between temperature measurement points of the battery with EG/PA-5.0 film are 32.1°C and 1.2°C. After charge-discharge at 1C for 100 cycles, the thermal properties of EG/PA remain basically unchanged, and it has good cycle stability. The simulation results are in good agreement with the actual temperature changes of the battery at different discharge rates. This work indicates that sulfur-free EG/PA composite has a good application prospect in BTMS of the power batteries.

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