LLTO纳米粒子改性的PVDF-PEO基复合微孔聚合物膜

Composite PVDF-PEO based microporous polymer membrane reinforced by LLTO nanoparticle

采用简单的相转化法制备了掺杂La0.5Li0.5TiO3(LLTO)的以聚偏氟乙烯(PVDF)和聚氧乙烯(PEO)为基体的PVDF-PEO/LLTO复合微孔聚合物膜。添加入LLTO快离子导体后,由于在LLTO的表面形成了新的锂离子传输通道,使得复合微孔聚合物膜的电化学性能提高。当LLTO的掺杂量为8%时,该复合微孔膜的孔隙率和吸液性能分别可达到62.38%和240.28%,吸液后室温锂离子电导率可达2.15×10-3Scm-1,电化学稳定窗口可达4.5V。可见,这种具有较高的锂离子电导率和电化学稳定性较好的复合微孔膜可为锂离子电池的隔膜材料提供新的选择。

Composite microporous polymer membrane based on poly（vinylidene fluoride）（PVDF）,poly（ethylene oxide）（PEO）,and La0.5Li0.5TiO3（LLTO）nanoparticle（denoted as PVDF–PEO/LLTO）was prepared by a simple phase inversion technique.LLTO nanoparticle can improve the electrochemical properties with forming new channels on its surface.When the content of LLTO is 8%,the porosity of the composite microporous membranes is up to 62.38%,liquid electrolyte（1 mol L-1LiPF6/EC/DMC solution）weight uptake is 240.28%,ionic conductivity is up to 2.15 × 10-3 S/cm,and the electrochemical window is 4.5V.The high room temperature ionic conductivity combined with good electrochemical stability implies that PVDF–PEO/LLTO based composite microporous polymer membrane can be used as candidate separator material for practical applications in lithium ion batteries.