短纤维网/熔喷/短纤维网水刺复合隔膜的制备

Preparing combing / melt-blown / combing spunlaced composite separator

采用水刺加固的方法将聚丙烯（PP）短纤维网与永久亲水聚丙烯熔喷非织造材料进行复合,再通过热轧制备厚度、孔隙率和抗张强力等基本性能满足镍氢（MH/Ni）电池要求的复合隔膜,研究了复合隔膜的水刺工艺,对比了复合隔膜与商业隔膜的吸液、保液性能及组装的MH/Ni电池的循环性能。水刺加固时,最高水射流压力不宜超过6.0 MPa;复合隔膜的耐碱损失率不到1%,吸碱率超过300%,表现出良好的化学稳定性和亲水性;以0.5 C在0.8~1.5 V循环100次,组装的MH/Ni电池的放电容量衰减率与商业隔膜相比要低3%。

Spunlace and hot-pressing process were used to prepare the composite separator,which was composited with two layers of polypropylene staple fibers sandwiched with one layer of hydrophilic melt-blown nonwoven. The thicknesses,porosity,tensile strength of composite separator were tested and all met the battery separator requirements. The spunlace process of composite separator was investigated; the highest water jets pressure should not be more than 6. 0 MPa. The mass loss in KOH storage of composite separators was less than 1%,the electrolyte absorption was more than 300%; compared with the commercial separator,the capacity attenuation of MH / Ni batteries packed with the composite separators was lower 3%,cycled 100 times in 0. 8 ~ 1. 5 V with 0. 5 C.