添加SP和HF制备高强度高延伸铜箔工艺研究  

Preparation of high strength and high elongation copper foil by adding SP and HF

作　　者：王丽娜 王庆福 樊斌锋 王江帆 王旭阳 WANG Lina;WANG Qingfu;FAN Binfeng;WANG Jiangfan;WANG Xuyang(Henan Gaojing Copper Foil Industrial Technology Research Institute Co.,Ltd.,Lingbao 472500,China)

机构地区：[1]河南高精铜箔产业技术研究院有限公司,河南灵宝472500

出　　处：《中国有色冶金》2025年第1期114-121,共8页China Nonferrous Metallurgy

基　　金：河南省重点研发专项“锂电池用极薄双面光电解铜箔关键技术研发与应用”(231111241000)。

摘　　要：铜箔是锂离子电池负极集流体关键材料,在电池电化学循环过程中,受到交变应力的作用,因此其抗拉强度和延伸率对锂电池的安全性能和寿命有重要影响。目前市场上还没有同时具备高抗拉强度和高延伸率的锂电铜箔,现有的8μm高延伸率锂电铜箔可以满足E%≥14%,但其常温抗拉强度低于350 MPa。本研究引入两类新型添加剂硫脲衍生物SP和含氮有机物HF制备具有高抗拉强度和高延伸率的8μm厚双面光锂电铜箔,优化了工艺参数,并进行了铜箔性能测试,得到以下主要结论。SP-500对铜离子电沉积过程具有抑制作用,HF-1000则对铜离子电沉积具有促进作用;在电解工艺参数为铜离子浓度100~120 g/L、硫酸浓度80~100 g/L、电解液温度40±5℃、电解液流量50±5 m^(3)/h的条件下,添加HEC 80 mL/min、明胶30 mL/min、SP-500 20 mL/min、HF-1000 40 mL/min,可以使铜箔在190℃/1 h的高温条件下延伸率(E%)达到13.95%,且常温抗拉强度(T/S)达到450.25 MPa,毛面光亮度≥40;70℃/16 h的老化处理条件为最佳,可使铜箔的常温抗拉强度和高温延伸率在60 d内衰减幅度最小,分别保持在434.21 MPa和13.91%以上。这项研究为高抗拉强度、高延伸率铜箔的开发提供了新思路,能够在一定程度上进一步提升锂电池的稳定性。Copper foil is a key material for the negative current collector of lithium-ion batteries.During the electrochemical cycling process,it is subjected to alternating stress,so its tensile strength and elongation have a significant impact on the safety performance and lifespan of lithium-ion batteries.Lithium ion copper foil with both high tensile strength and high elongation has not yet appeared on the market,The 8 μm high elongation lithium copper foil with E% ≥14% has a tensile strength below 350 MPa at room temperature.This study prepared 8 μm thick double-sided lithium battery copper foil with high tensile strength and elongation by introducing two new types of additives,namely thiourea derivative SP and nitrogen-containing organic compound HF,and the process parameters were optimized,the copper foil performance was tested.The main conclusions are as follows.SP-500 has an inhibitory effect on copper ion electrodeposition process,while HF-1000 has a promoting effect on copper ion electrodeposition.Under the conditions of copper ion concentration of 100-120 g/L,sulfuric acid concentration of 80-100 g/L,electrolyte temperature of 40±5 ℃,and electrolyte flow rate of 50±5 m^(3)/h in the electrolysis process,the dosage ratio of HEC 80 mL/min,gelatin 30 mL/min,SP-500 20 mL/min,and HF-1000 40 mL/min can achieve the elongation(E%) of copper foil to 13.95% at high temperature of 190 ℃/1 h,and the tensile strength(T/S) at room temperature to 450.25 MPa,with a surface gloss of ≥40.The optimal aging treatment conditions are 70 ℃/16 h,which can minimize the attenuation of the tensile strength at room temperature and elongation at high temperature of copper foil within 60 days,maintaining above 434.21 MPa and 13.91%,respectively.This study provides new ideas for the development of high tensile strength and high elongation copper foils,which can further improve the stability of lithium batteries to a certain extent.

关 键 词：锂电铜箔 常温抗拉强度 高温延伸率 新型添加剂 硫脲衍生物SP 含氮有机物HF 稳定性 

分 类 号：TF803.27[冶金工程—有色金属冶金] TQ153.14[化学工程—电化学工业]