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采用化学聚合法合成了PEDOT粉体.将PEDOT/乙炔黑/PTFE和乙炔黑/PTFE分别按质量比4.5/4.5/1和9/1进行混合,调浆后均匀涂覆在镍网上,作为锂氧电池空气电极.用FTIR对复合物的结构进行分析.用四探针法、循环伏安法、恒流充放电法和电化学阻抗法研究了乙炔黑和PEDOT/乙炔黑两种材料的导电性及电化学性能.测试结果表明,乙炔黑/PTFE(9/1)和PEDOT/乙炔黑/PTFE(4.5/4.5/1)的还原电位分别为2.20和2.57 V;乙炔黑/PTFE(9/1)的首次放电比容量为2812 mA h/g,而PEDOT/乙炔黑/PTFE(4.5/4.5/1)的比容量则达到了4056 mA h/g;添加PEDOT使乙炔黑模拟电池的电荷转移阻抗降低了~76.8%,表明PEDOT能够使锂离子在脱/嵌过程中的极化变小.以上结果说明PEDOT能够有效提高乙炔黑的电催化性能.
PEDOT powder was synthesized by chemical polymerization method, PEDOT / acetylene black / PTFE and acetylene black / PTFE were mixed by mass ratio of 4.5 / 4.5 / 1 and 9/1, respectively, Oxygen battery air electrode.The structure of the composite was analyzed by FTIR.The conductivity of the two materials, acetylene black and PEDOT / acetylene black, was investigated by four-probe method, cyclic voltammetry, constant current charge-discharge method and electrochemical impedance spectroscopy The results show that the reduction potentials of acetylene black / PTFE (9/1) and PEDOT / acetylene black / PTFE (4.5/4.5/1) are 2.20 and 2.57 V, respectively; 1) had a first discharge specific capacity of 2812 mAh / g and a PEDOT / acetylene black / PTFE (4.5/4.5/1) had a specific capacity of 4056 mAh / g; addition of PEDOT allowed the charge transfer of the acetylene black analog battery Impedance decreased by ~ 76.8%, indicating that PEDOT can make the lithium ion in the process of depolarization become smaller polarization.The above results show that PEDOT can effectively improve the acetylene black electrocatalytic performance.