聚吲哚/聚丙烯腈聚合物基电解质膜的制备及性能

Preparation and properties of polyindole/polyacrylonitrile polymer-based electrolyte films

为代替纤维素纸(C-P)基电解质膜用于铝空气电池,利用静电纺丝技术制备了聚吲哚/聚丙烯腈(PIN/PAN)聚合物基电解质膜。采用SEM和FTIR对PIN/PAN纤维表面形貌及化学组成进行了分析。通过电化学工作站和电池测试系统分析了PIN含量对PIN/PAN聚合物基电解质膜离子电导率、离子扩散系数及固态铝空气电池放电性能的影响。结果表明,PIN/PAN纤维的孔隙率、吸液率、断裂伸长率与加入的PIN含量有关,同时对碱性溶液具有良好的吸附能力及机械性能,其中,PIN含量(以PAN溶液的质量为基准,其中,溶剂为N,N-二甲基甲酰胺,下同)为4%的PIN/PAN纤维(记为4%PIN/PAN纤维)的吸液率达496%、孔隙率为87.1%、断裂伸长率为8.7%,分别是C-P的3.2、1.1、3.8倍。基于PIN/PAN纤维制备的PIN/PAN聚合物基电解质膜可有效提升固态铝空气电池性能。其中,4%PIN/PAN聚合物基电解质膜在3、5、7 m A/cm^(2)电流密度下,放电时长比C-P铝空气电池分别提升约18%、32%、38%,离子电导率为6.7×10^(–4)S/cm,离子扩散系数为2.69×10^(–8)cm^(2)/S。

Polyindole/polyacrylonitrile(PIN/PAN)polymer-based electrolyte films were prepared by electrospinning technology and applied to solid-state aluminum air battery to replace cellulose paper(C-P)based electrolyte film.The surface morphology and chemical composition of PIN/PAN fibers were then analyzed by SEM and FTIR.And the effects of PIN content on the ionic conductivity,ionic diffusion coefficient and solid-state aluminum-air battery discharge of PIN/PAN polymer electrolytes were investigated via electrochemical workstation and battery test system.The results showed that the PIN content affected the porosity,liquid absorption rate and elongation at break of PIN/PAN fibers.At the same time,it showed good adsorption capacity and mechanical properties for alkaline solution.The liquid absorption rate,porosity and elongation at break of the PIN/PAN fiber with 4%PIN content(based on the mass of PAN solution,N,N-dimethyl-formamidethe as solvent,the same below)was 496%,87.1%and8.7%,which were 3.2,1.1 and 3.8 times that of cellulose paper,respectively.The PIN/PAN polymer-based electrolyte films prepared from PIN/PAN fibers could effectively improve the performance of solid aluminum air battery.The discharge duration of 4%PIN/PAN polymer electrolyte film was about 18%,32%and 38%higher than those of C-P aluminum-air battery at current densities of 3,5 and 7 m A/cm~2,respectively.The ionic conductivity was 6.7×10^(–4)S/cm,and the ionic diffusion coefficient was 2.69×10^(–8)cm^(2)/S.