【摘要】 采用水溶性粘结剂羟甲基纤维素（CMC）制备含Al₂O₃颗粒的浆料,通过浸渍法将浆料均匀地涂覆在无纺布基底两侧,常温压制得到Al₂O₃/CMC无纺布复合隔膜,并对复合隔膜进行了系统的研究。结果表明:MS-2复合隔膜样品（CMC添加量=0.25%）表面均匀地填充Al₂O₃颗粒,可以减小基底表面的孔径、提高隔膜的孔隙率及对电解液的吸附性,降低了隔膜的界面阻抗;相比于Celgard 2300隔膜,MS-2隔膜呈现出对电解液极佳的亲和性、优良的热稳定性及优异的电学性能。更多还原

【Abstract】 A new type Al₂O₃/carboxy methyl cellulose（CMC）-coated nonwoven separator has been developed successfully via a facile dip-coating process. Al₂O₃ and nonwoven membrane and CMC were applied as the inorganic ponder, coating substrate and binder respectively. The composite Al₂O₃/CMC/nonwoven separator（MS-2 separator: CMC=0.25%） displayed a homogeneous morphology with Al₂O₃ particles embedded in the big pores of the base nonwoven, which developed a porous structure. Therefore, the MS-2 separator exhibited higher porosity,superior electrolyte uptake and enhanced electrolyte wettability compared to the commercial Celgard 2300 separator.Furthermore, the MS-2 separator displayed superior dimensional thermal stability, indicating that it can significantly increase the safety of the lithium-ion batteries. Additionally, the coin cell assembled with the MS-2 separator exhibited superior electrochemical performance with cycling and discharge C-rate capability comparing to the cell assembled with Celgard 2300 separator.更多还原