摘要
以乙二醇二甲基丙烯酸酯和丙烯腈为单体,合成了聚合物poly(AN-co-PEGDMA),然后与聚偏氟乙烯(PVDF)共混,制备了不同poly(AN-co-PEGDMA)含量的PVDF/poly(AN-co-PEGDMA)共混隔膜,利用X射线衍射、扫描电子显微镜(SEM)、差示扫描量热对共混隔膜的性能进行表征。结果表明,随着poly(AN-co-PEGDMA)含量的增加,PVDF/poly(AN-co-PEGDMA)的玻璃化转变温度逐渐提高,衍射峰的谱峰强度逐渐降低,隔膜的结晶度降低。SEM结果显示,随着poly(AN-co-PEGDMA)含量的增加共混隔膜的孔隙变大,有利于电解液的有效吸收。通过对PVDF/poly(AN-co-PEGDMA)共混隔膜电导率、吸液率的测定,表明在poly(AN-co-PEGDMA)质量分数为30%时,制得的共混隔膜的性能较佳。在此基础上,对共混隔膜构建的聚合物锂离子电池的电化学稳定窗口、电池容量和循环性能进行测试,其电化学稳定窗口为0～4.7 V(vs Li+/Li),放电电容为1.433～1.151 mAh,可以满足商业使用要求,具有广阔的应用前景。
Poly（AN-co-PEGDMA） was synthesized using ethyleneglycol dimethacrylate and acrylonitrile as starting materials and separators with different content of poly（AN-co-PEGDMA） were prepared by blending with poly（vinylidene fluoride）（PVDF）. Properties of the separators were characterized through differential scanning calorimetry quantity analysis （DSC）, X-ray diffraction （XRD） analysis curves and scanning electron microscopy （SEM）. Results show that diffraction peak intensity decreases, glass transition temperature increases and degree of crystallinity decreases with increasing the content of poly（AN-co-PEGDMA）. The fact that the gaps in the separator enlarge as the content of poly（AN-co-PEGDMA） increasing help the separators absorbing the electrolytic solution effectively. When the mass fraction of poly（AN-co-PEGDMA） is 30%, both absorption rate and conductivity of the PVDF/poly（AN-co-PEGDMA） separator are better. The blend separators process higher ionic conductivity （2.08 × 10^-3 S/ cm, 20 ℃ ） and better electrolyte maintenance. The electrochemical stability is in the range of 0 - 4.7 V（vs Li^＋/Li）, the discharge capacity is in the range of 1.433 - 1.151 mAh. The measurements of the charge-discharge efficiency and discharge capacity of PVDF/ poly（AN-co-PEGDMA）separator reveal that the blend separator can be used in cells.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2013年第6期23-28,共6页
Engineering Plastics Application
基金
山西省自然科学基金项目(2011011022-4)
关键词
隔膜
聚偏氟乙烯
共混
性能
separator
poly（vinylidene fluoride）
blend
property
