Study on the influence of copper foil current collector roughness on lithium-ion battery performance

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-05-06 DOI:10.1007/s10853-025-10848-z

Lei Yang, Xige Lu, Shuiping Zhong, Huanlin Zhu, Wei Weng, Wen Tan, Xiaopeng Chi

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引用次数: 0

Abstract

Copper foil roughness is widely regarded as an important factor affecting the performance of lithium-ion batteries, but relevant research still lacks systematic and in-depth analysis. In this paper, 6 μm copper foil is prepared by electrodeposition and compared with purchased 6 μm copper foil. The influence of different roughness on the battery performance is analyzed by the distribution of relaxation time (DRT). The results show that the roughness of homemade copper foil (1.69 μm) is slightly higher than that of purchased copper foil (1.53 μm). The initial charging specific capacity of the homemade copper foil electrode reaches 372.51 mAh g⁻¹, significantly higher than that of the purchased copper foil electrode (323.89 mAh g⁻¹). DRT is used to analyze the electrochemical reaction kinetics of the batteries, it is found that the copper foil with a certain roughness can enhance its binding with the active substance, ensure stable and rapid conductive contact, reduce the side reaction caused by uneven lithiation, and minimize the increase in the impedance of each part during the electrode cycle, thereby ensuring stable battery operation. This study provides new insights into the application of copper foil in batteries and verifies the feasibility of homemade 6 μm copper foil.

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铜箔集流器粗糙度对锂离子电池性能影响的研究

铜箔粗糙度被广泛认为是影响锂离子电池性能的重要因素，但相关研究仍缺乏系统深入的分析。本文采用电沉积法制备了6 μm铜箔，并与外购的6 μm铜箔进行了比较。通过松弛时间（DRT）的分布分析了不同粗糙度对电池性能的影响。结果表明：自制铜箔的粗糙度（1.69 μm）略高于外购铜箔的粗糙度（1.53 μm）；自制铜箔电极的初始充电比容量达到372.51 mAh g−1，明显高于外购铜箔电极的323.89 mAh g−1。采用DRT对电池的电化学反应动力学进行分析，发现具有一定粗糙度的铜箔可以增强其与活性物质的结合，保证稳定快速的导电接触，减少不均匀锂化引起的副反应，最大限度地减少电极循环过程中各部分阻抗的增加，从而保证电池的稳定运行。该研究为铜箔在电池中的应用提供了新的见解，并验证了自制6 μm铜箔的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.