E-44环氧树脂/石墨烯复合材料热阻断特性研究  

Study on the Thermal Blocking Characteristic of E-44 Expoxy Resin/graphene Composites

作　　者：安长胜 欧齐翔 张荣超 张驰 张昭[3] 高志明[1] 刘严强 An Changsheng;Ou Qixiang;Zhang Rongchao;Zhang Chi;Zhang Zhao;Gao Zhiming;Liu Yanqiang(Tianjin University,Tianjin 300350,China;Changsha University,Changsha 410022,China;Zhejiang University,Hangzhou 310058,China;Zhejiang YUXI Corrosion Control Corporation Contact,Ningbo 315725,China)

机构地区：[1]天津大学,天津300350 [2]长沙学院,湖南长沙410022 [3]浙江大学,浙江杭州310058 [4]浙江钰烯腐蚀控制有限公司,浙江宁波315725

出　　处：《广东化工》2024年第19期39-41,共3页Guangdong Chemical Industry

基　　金：国家青年科学基金项目(52204307)。

摘　　要：为避免锂电池热失控造成的安全事故,本文将石墨烯均匀地分散在E-44环氧树脂基体中,以聚酰胺为固化剂将其固化成型,制备了一种具有正温度系数(Positive Temperature Coefficient,PTC)的环氧树脂/石墨烯导电复合材料,研究了石墨烯含量、固化工艺对复合材料室温电阻率的影响,并考查了复合材料的热稳定性及对LiFePO_(4)电池热阻断性能。结果表明,石墨烯质量分数为13 wt%,E-44环氧树脂与聚酰胺质量比为1∶0.5,固化温度为60℃,固化时间为12 h的样品,其室温电阻率为6.48×10^(2)Ω·cm,测试温度升高至140℃时,复合材料电阻率升高到4.62×10^(4)Ω·cm,PTC强度达到1.85,并具有可恢复特性。将其应用在LiFePO_(4)电池中,发现室温下E-44环氧树脂/石墨烯复合材料的加入不会影响电池的充放电性能,当测试温度为90℃时,电池的放电比容量仅为12.5 mAh/g,表现出优异的热阻断特性。本研究有助于推动环氧树脂基PTC导电聚合物的应用,为解决电池因热失控而引发的安全问题提供理论依据。To avoid safety accidents caused by thermal runaway of lithium batteries,graphene was uniformly dispersed in the E-44 epoxy resin matrix and cured with polyamide as a curing agent to prepare an epoxy/graphene conductive composite material with positive temperature coefficient(PTC)in this study.The effects of graphene content and curing process on the room temperature resistivity of the composite were investigated.Furthermore,the thermal stability and thermal blocking performance of the composite for LiFePO_(4) batteries was also examined.The results showed that the sample with a graphene mass fraction of 13 wt%,an E-44 epoxy resin to polyamide mass ratio of 1∶0.5,a curing temperature of 60℃,and a curing time of 12 h had a room temperature resistivity of 6.48×10^(2)Ω·cm.When the test temperature was increased to 140℃,the composite material's resistivity increased to 4.62×10^(4)Ω·cm,with a PTC strength of 1.85 and recoverable characteristics.When applied to LiFePO_(4) batteries,it was found that the addition of E-44 epoxy resin/graphene composite material at room temperature did not affect the charge and discharge performance of the battery.When tested at 90℃,the specific discharge capacity of the battery is only 12.5 mAh/g,demonstrating excellent thermal blocking characteristics.This study will help promote the application of epoxy resin-based PTC conductive polymers and provide a theoretical basis for solving safety issues caused by thermal runaway in batteries.

关 键 词：环氧树脂 石墨烯 阻温特性 热阻断特性 

分 类 号：TQ152[化学工程—电化学工业]