层状双金属氢氧化物复合改性聚偏氟乙烯凝胶电解质研究

采用共沉淀法制备了十二烷基硫酸根插层的层状双金属氢氧化物(DS-LDH),并与聚偏氟乙烯(PVDF)基质子交换和锂离子传导凝胶电解质复合.研究了DS-LDH在PVDF凝胶电解质中的分散及其对电导率的影响.发现DS-LDH基本以剥离、纳米尺度分散在PVDF电解质中.质子交换和锂离子传导电解质膜的电导率均随DS-LDH含量的增加先增加,当DS-LDH质量分率分别为7.4%和5.66%(基于PVDF质量)时,电导率达到最大值.未改性和复合PVDF基锂离子电解质的电导率均随温度的增加而增加,并都符合Vogel-Tamman-Fulcher方程.

Modification of Poly(vinylidene fluoride) Gel Electrolyte by Layered Double Hydroxide

Layered double hydroxides(LDH) were new inorganic materials used in the modification of polymer electrolytes.In this work,Mg-Al type LDH intercalated with dodecyl sulfate groups(DS-LDH) was prepared by a co-precipitation method and composed with poly(vinylidene fluoride)(PVDF) base proton and lithium conducting gel electrolytes.The results show that DS-LDH particles were mainly delaminated and dispersed in the PVDF matrix in a nanometer scale.The ionic conductivity of composite gel electrolyte increased with the increase of weight fraction of DS-LDH,and reached a maximum value when the weight fractions of DS-LDH were 7.4% and 5.66% for proton and lithium conducting electrolytes,respectively.It was also found that the ionic conductivities of pure PVDF and PVDF/DS-LDH composite lithium conducting gel electrolytes increased with temperature and obeyed Vogel-Tamman-Fulcher equation.