摘要
针对厚度0.0065 mm的高纯铝箔(纯度≥99.99%)在加工过程中出现的微裂纹及针孔缺陷进行了系统分析。通过对裂纹区、针孔区与正常区域的微观组织、力学性能及成分进行对比,揭示了缺陷的成因。结果显示,缺陷区域的晶粒尺寸分布不均、位错密度显著增加及织构特征变化,均导致了材料的脆性增强和成型性能的恶化。针对缺陷形成机制,提出了优化措施,包括调整中间退火温度、降低成品退火冷却速率及改进轧制润滑剂等。优化后,铝箔的晶粒度、抗拉强度及断后伸长率均显著改善,微裂纹长度和针孔密度明显降低,满足了锂离子电池集流体的成型要求。最终,经过工业化应用验证,优化后的铝箔在量产测试中良品率提高至99.2%,电池循环后粉体脱落率降低60%。本研究为高纯铝箔的缺陷分析及工艺优化提供了重要的理论依据和实践指导。
This study systematically analyzes the microcracks and pinhole defects that occur during the processing of high-purity aluminum foil(purity≥99.99%)with a thickness of 0.0065 mm.The causes of the defects were revealed by comparing the microstructure,mechanical properties and composition of the crack and pinhole areas with those of the normal areas.The results showed that the uneven grain size distribution,the significant increase in dislocation density and the change in texture characteristics in the defective areas all led to an increase in the brittleness of the material and a deterioration in the formability.Optimization measures were proposed based on the defect mechanism,including adjusting the intermediate annealing temperature,reducing the annealing cooling rate of the finished product and improving the rolling lubricant.After optimization,the grain size,tensile strength and elongation at break of the aluminum foil all showed significant improvement,and the length of microcracks and the density of pinholes were significantly reduced,meeting the molding requirements of lithium-ion battery current collectors.Finally,after verification by industrial application,the yield of the optimized aluminum foil in mass production testing increased to 99.2%,and the powder shedding rate after battery cycling was reduced by 60%.This study provides an important theoretical basis and practical guidance for defect analysis and process optimization of high-purity aluminum foil.
作者
黄奎
许泽兵
袁晓清
李桂淑
杨文豪
Huang Kui;Xu Zebing;Yuan Xiaoqing;Li Guishu;Yang Wenhao(Guangxi Guangtou Zhengrun New Material Technology Co.,Ltd.,HezhouGuangxi 542800,China)
出处
《山西冶金》
2025年第7期44-46,共3页
Shanxi Metallurgy
关键词
高纯铝箔
加工缺陷
设计优化
high-purity aluminum foil
processing defects
design optimization
