CAJ | 학술논문

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。
이용불동규완우련제개성납미SiO2，병장개성물분별가입취（편불을희-륙불병희）공취물（PVdF—HFP）용액중，제비성리리자전지격막。FT—IR화TGA측시표명，우련제이성공접지도납미SiO2표면；SEM、랍신、열수축화교류조항측시결과현시，전지격막중납미SiO2적분산성、막적궤계강도、열수축급전도솔도유명현적개선；전화학측시결과표명，함개성납미SiO2적PVdF—HFP전지격막적방전비용량화순배은정성균비함미개성납미SiO2적전지격막유소제고，우기시함7～（갑기병희선양）병기삼갑양기규완（KH570）개성SiO2적PVdF-HFP전지격막，각항성능균유교대적제고，기랍신강도가체8．63MPa，리자전도솔고체1．53×10^-3S／cm，방전비용량재충방전순배100차이내일직보지재142mAh／g이상。
Microporous separators for Li-ion batteries were made by adding SiO2 modified with different silane- coupling agents (KH550, KH560 and KH570) to the solution of PVdF-HFP. The modified SiO2 nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR) and thermo gravimetric analysis (TGA). The SEM, stretching, shrinking and AC impedance test results of membranes showed that the properties of PVdF-HFP composite membranes were improved significantly by the addition of modified SiO2 nanoparticles. The electrochemical tests showed that the discharge capacity and cycle stability of the PVdF-HFP composite membranes containing modified SiO2 nanoparticles were better than that containing the unmodified SiO2 nanoparticles. Especially for the PVdF-HFP composite membranes containing SiO2 nanoparticles treated with KH-570, the tensile strength was up to 8.63 MPa, the ionic conductivity was as high as 1.53× 10^-3 S/cm, and the discharge capacity remained above 142mAh/g within 100 charge-discharge cyeles.