涂布干燥温度对负极片剥离力的影响  

Effect of drying temperature during coating on the adhesion force of anode

作　　者：王玉西 汪智涛 吕兆财 孙晓辉 李景康 WANG Yuxi;WANG Zhitao;LYU Zhaocai;SUN Xiaohui;LI Jingkang(Hangzhou Narada Power Technology Co.,Ltd.,Hangzhou,Zhejiang 311222,China)

机构地区：[1]杭州南都动力科技有限公司,浙江杭州311222

出　　处：《电池》2024年第4期509-512,共4页Battery Bimonthly

摘　　要：涂布工序的干燥过程对极片的剥离力、外观等有显著的影响。采用4种温度参数设置(“低-高-低”、“递减”、“递增”、“高-低-高”),探究干燥速率对负极片的影响。各温度参数下,均呈现“过渡段-恒速干燥段-降速干燥段”的典型干燥速率曲线,但“递增”温度参数下恒速干燥阶段最长,烘箱利用率最高,且该温度参数下负极片剥离力最高,达到1.797 N/25 mm,与正常生产时设置的“低-高-低”温度相比提高约31.4%。利用热重测试直观比较各实验温度下黏结剂的分布情况,“递增”温度参数(70℃升至110℃)下负极片内部黏结剂分布更均匀。In the coating process,the drying process has a significant impact on the adhesion and appearance of the electrode.Four temperature parameters("low-high-low","decreasing","increasing","high-low-high")are used to explore the influence of drying rate on the anode electrode.The typical drying rate curves of"transition phase-constant speed drying phase-decreasing speed drying phase"is presented under all temperature parameters,but has the longest constant speed drying phase and the highest oven utilization rate under"increasing"temperature parameters.Under this temperature parameter,the adhesion of anode electrode foil is the highest,reaching 1.797 N/25 mm,which is about 31.4%higher than the"low-high-low"temperature set in normal production.The thermogravimetric test is used to visually compare the binder migration at different experi-mental temperatures,the binder distribution in the anode electrode is more uniform under"increasing"temperature parameters(70℃increase to 110℃).

关 键 词：锂离子电池 负极 涂布工艺 干燥温度 极片烘干 剥离力 

分 类 号：TM912.9[电气工程—电力电子与电力传动]