以5,10-二氢吩嗪和1,6-二溴芘为原料,通过Buchwald-Hartwig芳胺化反应合成出新型聚合物聚(吩嗪-芘)(p-PyPZ),将其作为有机锂电池正极材料,研究其电化学和电池性能。通过FT-IR及XPS对新型聚合物材料的结构形貌进行表征,并通过电化学循环伏安(CV)法对其性能进行测试。结果表明,聚合物p-PyPZ具有多重氧化还原特征,在3.590/3.447V处出现芘结构单元对应的氧化还原特征峰,表明新型共聚物中芘结构单元即作为链接单元,同时参与氧化还原过程,使制备的电极材料具有多电子储能特性。作为锂离子电池正极材料,聚合物p-PyPZ表现出优良的循环稳定性。在电流密度为20 mA/g的条件下,其稳定放电比容量达到112.1mAh/g,经过50圈充放电循环后仍能保持在113 mAh/g。在20、50、100、200mA/g和500 mA/g的电流密度下的放电比容量分别稳定在114.7、109.6、103、96.6 mAh/g和92.1 mAh/g。

Taking 5,10-dihydrophenazine and 1,6-dibromopyrene as raw materials,poly(phenazine-pyrene) (p-PyPZ),a novel polymer,is synthesized through the Buchwald-Hartwig arylation reaction,and used as lithium battery cathode materials.Its electrochemistry and battery performance are studied,its structural morphology is characterized by means of FT-IR and XPS,and its performance is tested through electrochemical cyclic voltammetry (CV).The results show that the p-PyPZ polymer has multiple redox characteristics,and the redox characteristic peak corresponding to the pyrene structural unit appears at 3.590/3.447 V,indicating that the pyrene structural unit in the novel copolymer serves as a linking unit and participates in the redox process at the same time,making the prepared electrode material have multi-electron energy storage properties.As a cathode material for lithium-ion battery,p-PyPZ polymer exhibits excellent cycle stability.At a current density of 20 mA·g^-1,its stable discharge specific capacity reaches 112.1 mAh·g^-1,which can still remain at 113 mAh·g^-1 after 50 charge-discharge cycles.Its discharge specific capacities are stable at 114.7 mAh·g^-1,109.6 mAh·g^-1,103 mAh·g^-1,96.6 mAh·g^-1 and 92.1 mAh·g^-1,respectively at current densities of 20 mA·g^-1,50 mA·g^-1,100 mA·g^-1,200 mA·g^-1 and 500 mA·g^-1.

费强(1997-),男,硕士生,研究方向为锂离子电池正极材料,1040608639@qq.com;苏畅(1975-),男,博士,教授,博士生导师,研究方向为新能源材料与储能技术,通讯联系人,suchang@syuct.edu.cn。