一种新型的复合离子液体的微孔聚合物电解质的制备与研究  

Preparation of microporous gel polymer electrolytes activated with room temperature ionic liquid for lithium battery

作　　者：翟玮[1] 王龙[1] 严鹏[2] 王宁[2] 刘晓敏[1] 杨晖[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]纳米技术及应用国家工程研究中心,上海200241

出　　处：《化工新型材料》2015年第9期71-73,76,共4页New Chemical Materials

基　　金：江苏省自然科学基金重点资助项目(BK2011030);江苏省教育厅重点资助项目(KJA430006);江苏高校优势学科建设工程资助项目

摘　　要：利用相转化法制备了PVDF-HFP/PMMA的微孔聚合物膜,离子液体1-丁基-3-甲基咪唑四氟硼酸盐(BmimBF4)作为一种不易燃,不挥发性的增塑剂,用于活化微孔聚合物膜,最后得到一种安全的聚合物电解质。通过用场发射扫描电镜(FESEM)、离子液体载液量、孔隙率和差热分析(DSC)对由不同比例的PVDF-HFP/PMMA做成的微孔聚合物膜进行表面形貌及结构分析,并对得到的最优配比的微孔聚合物电解质的电化学性能进行了研究。研究结果表明:微孔聚合物电解质膜MIL-60表现出最低的玻璃化转变温度Tg以及在30℃下最高的离子电导率1.4×10-3S/cm,组装LiFePO4/MIL-60/Li扣式电池,在0.1C下首次放电可达到157mAh/g,并且在50次循环后还有151mAh/g。The micro-porous matrix was poly（vinylidene fluoride-co-hexafluoropropylene）/poly（methyl methacry- late） （PVDF-HFP/PMMA） membranes synthesized via a phase inversion method. Ionic liquid 1-bultyl-3-methylimidazolium tetrafluoroborate （[Bmim]BF4） was selected as a plasticizer to fabricate the matrix due to its non-volatility and inflamma- bility. The effect of the ratio of PVDF-HFP to PMMA on the properties of membrane, such as the morphology, porosity and liquid uptake capability were systematically studied. Electrochemical properties of the optimized gel polymer electrolyte were also studied. The results showed that the electrolyte MIL-60 presented the lowest Tg and therefore exhibited the high- est ionic conductivity. The LiFePO4/MIL-60/Li coin-typed cell cycled at 0. 1C showed the 1st discharge capacity up to 157mAh·g^-1 ,and remained 151mAh·g^-1 on the 50th cycle.

关 键 词：微孔聚合物电解质 离子液体 相转化法 

分 类 号：TQ317[化学工程—高聚物工业]