【作者】 叶伟； 李奇； 韩绍昌； 徐仲榆；

【Author】 YE Wei, LI Qi, HAN Shao-chang, XU Zhong-yu ( Institute of Batteries and Polymer Materials, Hunan University, Changsha 410082, China; Institute of New Carbon Materials, Hunan University, Changsha 410082, China)

【机构】 湖南大学电池与高分子材料研究所； 湖南大学新型炭材料研究所；

【摘要】 通过溶液浇铸法分别制备了全固态无机和有机共混改性的两种PEO基聚合物复合电解质。利用交流阻抗、示差扫描热分析等测试手段考察了SiO2颗粒度及P(VDF-HFP)含量对(PEO)12LiCIO4电解质体系电导率的影响,并对其进行了分析比较。结果表明,加入SiO2及P(VDF-HFP),体系电导率均有较大的改善。随着加入的SiO2颗粒度减小及P(VDF-HFP)含量减少,两种复合电解质的电导率呈现出先增大后减小的变化规律。当SiO2 颗粒度处于15-5μm时,(PEO)12LiCIO4-10%SiO2体系的室温(25℃)电导率最大,σmax=1.58×10-4S·cm-1 当ω(PEO):ω(P(VDF-HFP))=1:0.5时.(PEO)12LiClO4-P(VDF-HFP)体系的室温电导率最大,σmax=2.05 ×10-4S·cm-1。更多还原

【Abstract】 Two kinds of all-solid inorganic and organic modified-blending PEObased polymer composite electrolytes were prepared by a solution casting technique. The effects of particle size of SiO2 and content of P( VDF-HFP) on the conductivity of (PEO)12LiClO4 electrolytes were studied in terms of AC impedance and DSC, and compared with each other. The results show that the conductivities of polymer composite electrolytes are improved markedly by the addition of SiO2 and P(VDF-HFP), and increased initially and decreased subsequently with decreasing particle size of SiO2 and reducing content of P( VDF-HFP). When the particle size of SiO2 is 15 - 5μm and ω(PEO) ’ ω(P( VDF-HFP)) = 1 :0. 5, the conductivities of (PEO)12 LiClO4-10% SiO2 electrolyte and (PEO)12 LiClO4-P( VDF-HFP) electrolyte reach up to the maximums 1. 58×10-4 S·cm-1 and 2. 05×10-4 S·cm-1 , respectively.更多还原