摘要
以聚偏氟乙烯(PVDF)与醋酸纤维素(CA)的共混物为基本材料,加入纳米SiO2对其进行共混改性,制备了有机/无机复合锂离子电池隔膜,研究了纳米SiO2添加量对复合膜物理性能与电化学性能的影响。通过万能试验机、接触角仪、扫描电子显微镜(SEM)、热重分析仪(TG)、交流阻抗与电池充放电测试,对复合隔膜及其组装的电池进行表征,结果表明,在PVDF/CA共混基体中加入纳米SiO2可有效提高隔膜的相关性能,其中添加9%纳米SiO 2的复合膜(PCS9)综合性能较优,即吸液率124.97%,离子电导率1.01 mS/cm,拉伸强度27.35 MPa,组装的锂离子半电池在0.2 C/0.2 C下循环充放电50圈后,放电比容量保持良好稳定,达到145.7 mA·h/g左右。
The organic/inorganic composite membrane for Li-ion batteries was made by adding silicon dioxide(SiO2)nanoparticles into the polyvinylidene fluoride/cellulose acetate(PVDF/CA)matrix.The effect of SiO2 contents on the physical and electrochemical properties of the composite membranes was studied.The properties of the composite membranes and the cells assembled with the composite membranes were characterized by using the universal tensile machine,contact angle meter,scanning electron microscope(SEM),thermogravimetry analysis(TGA),alternating-current(AC)impedance and battery charge-discharge test.The results indicate that adding SiO2 into the PVDF/CA polymer matrix could improve the performance of the membranes efficiently.The membrane(PCS9)containing 9%SiO2 shows good comprehensive performance,which the electrolyte uptake is 124.97%,the ionic conductivity is 1.01 mS/cm and the tensile strength is 27.35 MPa.Meanwhile,the cells assembled with the PCS9 could display better cycle performance,and after 50 cycles under the constant current mode at 0.2C/0.2C,the specific discharge capacity could keep stable and reach about 145.7 mA·h/g.
作者
周宽
胡江南
张明祖
ZHOU Kuan;HU Jiang-nan;ZHANG Ming-zu(College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2020年第4期48-52,共5页
China Plastics Industry
基金
江苏省自然科学基金面上项目(BK20151263)
江苏省高校优势学科建设工程资助项目(PAPD)。
关键词
聚偏氟乙烯
醋酸纤维素
二氧化硅
隔膜
Polyvinylidene Fluoride
Cellulose Acetate
Silicon Dioxide
Membrane
