摘要
以异佛尔酮二异氰酸酯(IPDI)、聚氧化丙烯二醇(N220)、聚己二酸新戊二醇酯(PNA)、聚己二酸-1,4-丁二醇酯(PBA)为主要原料,制备了3种水性聚氨酯(WPU)粘结剂。采用IR、DSC和TG对3种水性聚氨酯膜进行了结构表征并测试了它们的力学和溶胀性能。通过循环、倍率等测试考察了以这3种水性聚氨酯为粘结剂的锂电池的电化学性能,并与以聚偏二氟乙烯(PVDF)为粘结剂的电池进行了比较。结果表明:以N220为软段的水性聚氨酯胶膜的拉伸强度为11 MPa,玻璃化转变温度为?52℃,初始分解温度为273.6℃,符合电池粘结剂的要求。并且以其作为粘结剂的电池在200次循环后,容量保持率可达到97.7%,明显高于以PBA型(87.9%)、PNA型(84.1%)水性聚氨酯和PVDF(90.5%)为粘结剂的电池。
Three waterborne polyurethane(WPU)binders were prepared using isophorone diisocyanate(IPDI),polyoxypropylene diol(N220),poly(neopentyl glycol adipate)(PNA),polyadipate-1,4-butanediol diol(PBA)as main raw materials.Three waterborne polyurethane films were characterized by IR,DSC and TG.Their mechanical properties and swelling properties were tested.The electrochemical performances of lithium batteries using these three waterborne polyurethanes as binders were investigated by cycles and magnifications,and compared with those using PVDF as binder.The results showed that the tensile strength,glass transition temperature and initial decomposition temperature of the waterborne polyurethane film using N220 as soft segment was 11 MPa,?52℃,and 273.6℃,which met the requirements of battery binder.Moreover,after 200 cycles,the capacity retention rate of lithium-ion battery using the above polyurethane as binder reached 97.7%,significantly higher than that of batteries using the waterborne polyurethanes with PBA(87.9%)and PNA(84.1%)as soft segments,respectively,as well as using polyvinylidene fluoride(PVDF 90.5%)as binder.
作者
谢功山
王志成
袁爱宁
鲍俊杰
黄毅萍
许戈文
XIE Gong-shan;WANG Zhi-cheng;YUAN Ai-ning;BAO Jun-jie;HUANG Yi-ping;XU Ge-wen(College of Chemistry and Chemical Engineering,Anhui University,Anhui Province Key Laboratory of Green Polymers,Anhui Engineering Technology Research Center,Water-based Polymer Materials,Hefei 230601,Anhui,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第9期1956-1961,共6页
Fine Chemicals
基金
安徽省自然科学基金项目（1808085QE173）
安徽省高校科学研究项目（KJ2017A031）
关键词
水性聚氨酯
锂离子电池
粘结剂
waterborne polyurethane
lithium-ion battery
binder
