含偶氮苯共轭微孔聚合物的制备及其锂离子电池性能研究

摘要

以2,2′,7,7′-四频哪醇硼酸酯-9,9′-螺二芴、1,4-苯二硼酸和4,4′-二溴偶氮苯为聚合物中间体,采用钯催化的Suzuki-Miyaura偶联反应制备了2种含偶氮苯结构的共轭微孔聚合物Azo-SBF和Azo-PH,对聚合物的结构进行了表征,并研究了调节构筑单元后共轭微孔聚合物作为正极材料的聚合物的锂离子电池性能.结果表明,2种聚合物Azo-PH和Azo-SBF的 BET比表面积分别为113 m2·g-1和446 m2·g-1,热力学分解温度均超过了400 ℃;100 mA·g-1的电流密度下对聚合物锂离子电池充放电特性测试表明,相比Azo-PH,Azo-SBF电极展现出10.226 mA·h·g-1的初始充电比容量和稳健的循环稳定性,800次充放电循环后,Azo-SBF仍然展现出9.333 mA·h·g-1的放电比容量.%We prepared two kinds of azobenzene-based conjugated microporous polymers(Azo-SBF,Azo-PH) by palladium-catalyzed Suzuki-Miyaura coupling condensation reaction of 2,2′,7,7′-tetra(pinacol)borate-9,9′-spirobiflu-orene,1,4-phenyldiboronic acid,and 4,4′-dibromoazobenzene,characterized their structures,and investigated the per-formance of lithium ion battery after adjusting the building unit.The results show that the BET specific surface areas of Azo-PH and Azo-SBF are 113 m2·g-1and 446 m2·g-1,respectively,and thermodynamic decomposition temperatures are all above 400 ℃.Compared with Azo-PH,Azo-SBF electrode showed an improved initial specific charge capacity of 10.226 mA ·h· g-1and relatively stable cycling stability at current density of 100 mA·g-1.The Azo-SBF electrode still exhibits a specific discharge capacity of 9.333 mA·h·g-1after 800 charge-discharge cycles.