以聚乙烯醇(PVA)为成纤聚合物,以水为溶剂,通过静电纺丝技术制备了锂离子电池用纳米纤维隔膜,研究了PVA醇解度和纺丝液含量对隔膜孔隙率、吸液率、热尺寸稳定性、力学性能和电化学性能的影响。结果表明:在纺丝液含量相同的条件下,PVA的醇解度越高,隔膜的孔隙率、吸液率、抗拉强度、热尺寸稳定性和离子电导率呈逐渐增大的趋势;在PVA醇解度相同的条件下,随着纺丝液含量的增加,隔膜的孔隙率和离子电导率逐渐升高,抗拉强度呈下降趋势;PVA的醇解度和纺丝液含量对隔膜的电化学稳定性影响很小。
The nanofibrous separator of lithium-ion battery was prepared by electrospinning technology using poly(vinyl alcohol) (PVA) as fiber forming polymer and water as solvent.The effects of PVA alcoholysis degree and spinning solution content on the porosity,liquid absorption ratio,thermal dimensional stability,mechanical properties and electrochemical properties of the separator was intensively investigated.The results showed that,under the same spinning solution content,the porosity,liquid absorption ratio,tensile strength,thermal dimensional stability and ionic conductivity of the separator increased with the increase of PVA alcoholysis degree.Under the same PVA alcoholysis degree,with spinning solution content rising,the porosity and ionic conductivity of the separator gradually increased,whereas its tensile strength decreased.Both PVA alcoholysis degree and spinning solution content had little effects on the electrochemical stability of the separator.
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基金资助
国家自然科学基金面上项目(51373030)
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