摘要
为了提高凝胶聚合物电解质(GPE)的离子传输性,以低聚倍半硅氧烷(POSS)为核,臂结构为聚甲基丙烯酸甲酯(PMMA),臂聚合度不同的八臂星型聚合物(POSS-(PMMA3)8、POSS-(PMMA6)8、POSS-(PMMA9)8)为改性剂,分别与PMMA共混制备复合GPE,研究了POSS星型聚合物臂结构对复合GPE电性能影响的规律.结果表明,POSS星型聚合物的引入,使得复合GPE的电导率较纯PMMA基GPE均有显著提高,其中臂聚合度较小的POSS-(PMMA3)8复合GPE在室温的电导率最大,比纯PMMA基GPE提高了3.5倍.分析了该星型聚合物不同含量以及锂盐浓度等对复合凝胶聚合物电解质的影响,发现锂盐浓度在凝胶体系中为0.6 mol/L,该星型聚合物含量为聚合物基体15 wt%时,复合凝胶聚合物电解质电导率最大为2.73×10-4S/cm.研究了温度对复合凝胶聚合物电解质离子传输性能的影响规律,发现其离子传输规律符合Arrhenius方程.在此基础上,提出了该凝胶电解质体系的离子传输微观结构模型.
In order to improve the ions transfer properties of gel polymer electrolytes（ GPEs）,three starshaped hybrid polymers with different polymerization degrees of arms： POSS-（ PMMA3）8,POSS-（ PMMA6）8,POSS-（ PMMA9）8,containing a polyhedral oligomeric silsesquioxane（ POSS） as a core with octa-poly（ methyl methacrylate）（ PMMA） chains as arms,were used as modifier and blended with PMMA to prepare the composite GPEs in the paper,respectively. The influence of arms structure of star-shaped polymers on the electrochemical performance of GPEs was investigated. The results showed that all composites GPEs containing POSS star-shaped polymers gave access to higher ionic conductivity than that of pure PMMA-based GPE. Starshaped polymer with the shortest PMMA arms,POSS-（ PMMA3）8modified GPE possessed the highest ionic conductivity,which was 3. 5 times higher than that of pure PMMA-based GPE in the room temperature. In addition,the contents of POSS star-shaped polymers and lithium salt also had effect on the performance of composite GPEs. It was found that when the concentration of lithium salt in the gel system was 0. 6 mol / L,and the content of star-shaped polymers in the polymer matrix was 15 wt%,the ionic conductivity would reach the highest value,2. 73 × 10- 4S / cm. Moreover the effect of temperature on the ion transfer performance of composite GPEs was investigated,and the rule of ion transfer along with temperature was accorded with the Arrhenius equation. Based on the results mentioned above,the ion conductive microstructure model of the composite GPEs was constructed.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2015年第7期852-857,共6页
Acta Polymerica Sinica
基金
陕西省自然科学基金(基金号2013JM2012)
陕西省科技统筹创新工程计划项目(项目号2013KTCG01-14)资助
关键词
八氯丙基低聚倍半硅氧烷
甲基丙烯酸甲酯
离子传输性能
交流阻抗
Octa-chloropropyl polyhedral oligomeric silsesquioxane
Methyl methacrylate
Ion transmission performance
AC impedance
