SiO_2/P(MMA-S)纳米复合电解质的制备与性能分析  

Preparation and performance analysis of SiO_2/P(MMA-S) nanocomposite 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：《南昌大学学报（工科版）》2015年第2期109-113,共5页Journal of Nanchang University(Engineering & 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资助项目(20133BBA13029)

摘　　要：聚合物锂离子电池具有安全、使用方便等特点,是当今最重要的新能源材料之一,研究和开发新型聚合物电解质是聚合物电池的核心内容。以聚甲基丙烯酸甲酯(PMMA)为聚合物基体,通过与苯乙烯(St)、三甲基丙烷三丙烯酸酯(TMPTA)进行交联共聚改性,复合有机锂盐改性纳米Si O2,通过相转化法制备多孔复合聚合物电解质膜。通过红外光谱(FT-IR)、X射线衍射(XRD)对复合聚合物膜结构进行了表征,采用扫描电镜(SEM)对该复合聚合物膜的孔形态进行了观察,采用热失重分析(TG)和差示扫描量热法(DSC)考察了复合聚合物膜热学性能,制备了结构可控、热稳定好的Si O2/P(MMA-S)纳米复合电解质。电化学研究表明:含有6%的改性纳米Si O2的电化学窗口达5.48 V,在0.1 C和0.2 C的倍率下,首次放电容量可达156.8 m Ah·g-1和147.6 m Ah·g-1,经过30次循环测试,容量保持率在93.5%和91.4%。Polymer lithium ion battery,with the most important characteristics of convenient using and safety,is one of the new energy materials. The research and development of new polymer electrolyte is the core content of polymer battery. The porous composite copolymer electrolyte membrane was prepared by polymethyl methacrylate（ PMMA） matrix with styrene（ St） and trimethyl propane triacrylate（ TMPTA） for cross-linking copolymerization,and doped with organic lithium salt modified nano-Si O2 by phase inversion method. The composite was characterized by Fourier transform infrared spectrometer（ FT-IR）,X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,thermalgravimetric analysis（ TG）,and differential scanning calorimetry（ DSC） to investigate the relationship between the performances of nanocomposites with those microstructures. The results indicated that Si O2/ P（ MMA-S）nanocomposite electrolyte with controllable structure,thermal stability and good electrochemical performance was prepared. The electrochemical window was 5. 48 V,and the initial discharge capacity of 156. 8 m Ah / g and 147. 6m Ah / g,after 30 cycles the capacity retention was 93. 5% and 91. 4% in 0. 1 C and 0. 2 C,with 6% modified Si O2 in the nanocomposite.

关 键 词：SiO2/P(MMA-S)纳米复合电解质 多孔膜 电化学性能 

分 类 号：TQ317.4[化学工程—高聚物工业]