Fatigue Strength and Damage Behavior of Micron-Thick Ultrathin Current Collector Cu Foil and Al Foil for Lithium-Ion Battery
Received date: 2022-10-14
Revised date: 2023-02-14
Online published: 2023-02-27
Supported by
National Natural Science Foundation of China(52071319)
With the rapid development of high-performance and high-energy-density lithium-ion batteries, lightweight current collector metal foils for lithium-ion batteries have become a crucial direction of industrial technological advancements. As the thickness of the current collector decreases, the fatigue failure problem becomes increasingly prominent. Once the fatigue failure of the current collector occurs, it will have a catastrophic impact on the electrochemical and safety performances of lithium-ion batteries. Here, to further clarify the fatigue damage mechanism of current collector foils, the high cycle fatigue strength and fatigue failure behavior of current collector Cu and Al foils for lithium-ion batteries under cyclic loading were experimentally investigated using tensile-tensile fatigue test and the EBSD technique. Results show that the fatigue cracks of the Cu foils mainly originate from the slip bands with larger grain sizes and propagate along the slip bands. Based on the microstructure observation and analysis of damaged grains, a statistical relationship between fatigue crack initiation and microstructure (grain size and its coefficient of variation, grain orientation, and Schmid factor (Ω)) of the Cu foils was obtained. Due to the presence of rolled defects on the surface of Al foils, the fatigue cracks are preferentially initiated at the surface defects. Extreme value statistics accurately predicted the possible defect population and the largest defect size in the Al foils, and the relationship between the defect size and fatigue limit was established using the Kitagawa-Takahashi diagram.
CHENG Fulai , LUO Xuemei , HU Bingli , ZHANG Bin , ZHANG Guangping . Fatigue Strength and Damage Behavior of Micron-Thick Ultrathin Current Collector Cu Foil and Al Foil for Lithium-Ion Battery[J]. Acta Metall Sin, 2024 , 60(4) : 522 -536 . DOI: 10.11900/0412.1961.2022.00523
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