构筑星形化合物提升交联网络固态聚合物电解质性能  

Constructing Star-Shaped Compound to Improve the Performance of Cross-Linked Solid Polymer Electrolytes

作　　者：王万慧 王春娟 胡骥 WANG Wanhui;WANG Chunjuan;HU Ji(School of Materials Science and Engineering,School of Environmental Engineering and Chemistry,Luoyang Institute of Science and Technology,Luoyang 471023,China;Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery,Luoyang 471023,China;Henan Intelligent Manufacturing Engineering Technology Research Center for Building Profile,Luoyang 471023,China)

机构地区：[1]洛阳理工学院材料科学与工程学院,环境工程与化学学院,洛阳471023 [2]河南省太阳能转换及锂钠基储能电池材料国际联合实验室,洛阳471023 [3]河南省建筑型材智能制造工程技术研究中心,洛阳471023

出　　处：《华南师范大学学报（自然科学版）》2024年第2期25-31,共7页Journal of South China Normal University(Natural Science Edition)

基　　金：河南省科技攻关(工业)项目(222102240060);河南省高等学校重点科研项目(23A430041);2022年度河南省高层次人才国际化培养资助项目。

摘　　要：通过巯基-丙烯酸酯点击反应引发三羟甲基丙烷三(3-巯基丙酸酯)(TMPMP)或季戊四醇四-3-巯基丙酸酯(PETMP)分别与聚(乙二醇)甲基丙烯酸酯(PEGMA)进行UV辐照反应,制得星型化合物。TMPMP或PETMP为交联剂,PEGMA为星形化合物的支链。星形化合物的结构可通过变换不同的交联剂,并通过改变PEGMA的相对分子质量进行调节。将星形化合物掺入交联固态聚合物电解质中,固态电解质的机械性能、电化学性能均得到改善。固态电解质的拉伸强度达83.9 MPa,杨氏模量达180.4 MPa,断裂伸长率达49.9%,拉伸韧性达22.6 MJ/m^(3),室温离子电导率达2.8×10^(-5) S/cm。利用该固态电解质组装Li/LFP全固态锂金属电池,在0.1 C倍率下循环100次后剩余比容量为111.5 mAh/g,比容量保持率为77%。The star-shaped compound was fabricated by a UV irradiation reaction between trimethylolpropane tris(3-mercaptopropionate)(TMPMP)or pentaerythritol tetrakis(3-mercaptopropionate)(PETMP)with the introduction of poly(ethylene glycol)methacrylate(PEGMA)follow the mechanism of thiol-acrylate click chemistry.Additionally,PETMP or TMPMP is used as the crosslinker in the system,and PEGMA is used as the branch chain of the star-shaped compound.The structure of the compound can be tuned by utilizing different crosslinker combined with varying the molecular weight of PEGMA,effectively.By blending the prepared star-shaped compound into a kind of cross-linked solid polymer electrolytes(SPEs),the mechanical and electrochemical performances of this SPEs are improved simultaneously.In particular,the tensile strength,Young s modulus,elongation at break,tensile toughness,and ionic conductivity at room temperature of the product is 83.9 MPa,180.4 MPa,49.9%,22.6 MJ/m^(3),and 2.80×10^(-5) S/cm,respectively.The discharge capacity of the solid-state lithium metal batteries assembled by the fabricated SPEs reaches 111.5 mAh/g at 0.1 C after 100 cycles,indicating nearly 77%of the capacity maintaining.

关 键 词：星型化合物 机械性能 固态聚合物电解质 锂金属电池 

分 类 号：O633.2[理学—高分子化学]