一种酞菁钴改性PEO-LLZTO复合聚合物电解质的制备与性能研究  

Preparation of a Cobalt Phthalocyanine Modified PEO-LLZTO Composite Polymer Electrolytes and Its Performance Study

作　　者：李慧[1,2] 酒红芳[1,2] 张立新[1,2] 马金凤 LI Hui;JIU Hong-fang;ZHANG Li-xin;MA Jin-feng(College of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China;Shanxi Key Laboratory of High Performance Battery Materials and Devices,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学化学与化工学院,山西太原030051 [2]中北大学高能电池材料与器件山西省重点实验室,山西太原030051

出　　处：《精细化工中间体》2025年第2期64-70,共7页Fine Chemical Intermediates

摘　　要：复合聚合物电解质因兼具无机电解质和聚合物电解质的优点而被广泛研究,但存在室温下离子电导率低和锂枝晶严重等问题。酞菁钴是由4个异吲哚单元组成的18电子大共轭化合物,其π-π共轭基团可以通过自发诱导的相极化主导聚合物中锂离子传输通道的结构。选用酞菁钴对复合聚合物电解质进行改性,通过溶液浇铸法得到一种CPEs/CoPc。CPEs/CoPc在60℃下离子电导率为4.23×10^(-4)S/cm、锂离子迁移数为0.51、电化学窗口为4.0V。其锂对称电池在0.2 mA/cm^(2)电流密度下可以循环超过900h,在0.2C下循环150圈后仍有78%的容量保持率,具有较好的应用前景。Composite polymer electrolytes have been widely studied due to the advantages of both inorganic and polymer electrolytes.However,they still have problems such as low ionic conductivity at room temperature and severe lithium dendrites.Cobalt phthalocyanine is an 18-electron macroconjugated compound consisting of four isoindole units withπ-πconjugate groups that can dominate the structure of lithium-ion transport channels in polymers through spontaneous induced phase polarization.Therefore,cobalt phthalocyanine was chosen to mod-ify the composite polymer electrolyte.The CPEs/CoPc obtained by solution casting method have an ionic conductivity of 4.23×10^(-4)S/cm,a Li-ion mobility number of 0.51 and an electrochemical window of 4.0V at 60℃.Their lithium symmetric battery can be cycled for more than 900 h at a current density of 0.2 mA/cm^(2),and still have 78%capacity retention after 150 cycles at 0.2C,which has a good application prospect.

关 键 词：复合聚合物电解质 离子电导率 LLZTO PEO 

分 类 号：TQ317[化学工程—高聚物工业]