Mi Jin Koh Hae Young Hwang Deuk Ju Kim Hyeng Jun Kim Young Taik Hong
材料科学技术（英）
Polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) / clay nanocomposite membranes were prepared by phase inversion method through controlling retention time to apply for a lithium ion secondary batteries. Increased membrane porosity with macrovoids was observed at increasing retention time. Partially intercalated structures of PVdF-HFP/clay nanocomposite membranes were confirmed by X-ray diffraction (XRD) analysis. PVdF-HFP membranes containing various kind of clay showed the increase of membrane modulus compared to the pristine PVdF-HFP membrane.
关键词:
PVdF-HFP
,
Porosity
,
Mechanical properties
,
Clay
,
Separator
孟菊雯
,
张明祖
,
倪沛红
,
徐玲妍
,
何金林
,
李晓菲
功能材料
利用不同硅烷偶联剂改性纳米SiO2，并将改性物分别加入聚（偏氟乙烯-六氟丙烯）共聚物（PVdF—HFP）溶液中，制备成锂离子电池隔膜。FT—IR和TGA测试表明，偶联剂已成功接枝到纳米SiO2表面；SEM、拉伸、热收缩和交流阻抗测试结果显示，电池隔膜中纳米SiO2的分散性、膜的机械强度、热收缩及电导率都有明显的改善；电化学测试结果表明，含改性纳米SiO2的PVdF—HFP电池隔膜的放电比容量和循环稳定性均比含未改性纳米SiO2的电池隔膜有所提高，尤其是含7～（甲基丙烯酰氧）丙基三甲氧基硅烷（KH570）改性SiO2的PVdF-HFP电池隔膜，各项性能均有较大的提高，其拉伸强度可达8．63MPa，离子电导率高达1．53×10^-3S／cm，放电比容量在充放电循环100次以内一直保持在142mAh／g以上。
关键词:
PVdF—HFP
,
纳米SiO2
,
改性
,
锂离子电池
,
隔膜
