纳米SiO_2的改性及其复合电解质的性能分析  

Modification and property analysis of nano-SiO_2 and its composite electrolyte

作　　者：王振希[1] 尚昕[2] 金志农[1] 饶国华[3] 欧阳球林[1] 刘晓红[2] 

机构地区：[1]南昌工程学院理学院,江西南昌330099 [2]南昌大学资源环境与化工学院,江西南昌330031 [3]江西省科学院产业处,江西南昌330096

出　　处：《南昌工程学院学报》2015年第4期1-6,共6页Journal of Nanchang Institute of Technology

基　　金：国家自然科学基金资助项目(51303074);江西省科研院所基础设施配套项目(20133BBA13029)

摘　　要：锂离子电池具有高电压、高容量和高比能量等特点,是重要的储能器件。针对传统的液态锂离子电池容易发生电解液泄漏、燃烧爆炸和短路等问题,聚合物锂离子电池虽可以较好地解决安全问题,但仍存在电导率、离子迁移分数和力学性能较低等因素。以叔丁醇钾与纳米SiO2表面的羟基进行反应,再将1,3-丙磺酸内酯进行接枝反应,对纳米SiO2表面进行接枝改性;以改性和未改性的纳米SiO2与苯乙烯、甲基丙烯酸甲酯进行聚合反应,制备SiO2/P(MMA-S)复合聚合电解质。FT-IR和TGA研究结果表明,纳米SiO2表面含有丙磺酸锂基团。采用扫描电镜研究改性前后的纳米SiO2颗粒的形态,发现改性后纳米SiO2粒度分布均匀、团聚减弱。SiO2/P(MMA-S)复合聚合物电解质的研究结果表明,含有质量比为6%的改性纳米SiO2的复合电解质膜的吸液率可达310%,经历15d失重率不超过18%,抗拉强度可达40.0MPa以上,断裂伸长率也超过40%,交流阻抗法测定其室温电导率可达3.98×10-3S/cm。Lithium ion battery ,with the characteristics of high vohage ,high capacity and high specific energy, is an important energy storage device. The traditional liquid lithium ion battery is prone to the safety problems such as electrolyte leakage, explosion and short circuit. The polymer Li ion battery can solve the security problems well, but it also has such problems as lower conductivity, ion mobility fraction, and mechanical properties. In this research, potassium tert butyl alcohol reacts with hydroxyl on the nano-SiO2 surface ,then with 1,5- propylene sulfonic acid ester grafting. SiO2/P （MMA-S） composite electrolyte was prepared with modified or unmodified nano-SiO2 with styrene, methyl methacrylate. The results of FT-IR and TGA indicate that the surface of nano-SiO2 contains propylene sulfonic acid group. Meanwhile the morphology of the nano-SiO2 particles was studied by SEM, and the size distribution of the nanoparticles was uniform and the agglomeration was decreased after modification of the nano-SiO2 particles. Research on SiO2/P（MMA-S） composite polymer electrolyte results show that the modified nano-SiO2 composite e- lectrolyte membrane imbibition containing 6% quality rate could reach 310%. After 15 days, the weight loss rate is no more than 18% ,the tensile strength could be more than 40.0 MPa,and the elongation at break could be more than 40% ,with the ionic conductivity being up to 3.98 × 10^-3S/cm at room temperature.

关 键 词：纳米SIO2 改性 复合电解质 性能与分析 

分 类 号：TQ317.4[化学工程—高聚物工业]