本发明涉及一种纤维素涂布锂离子电池隔膜及其制备方法，该方法为：取浆料经打浆抄纸作为基体，将溶解浆溶解后作为涂料涂布在基体表面，将涂布后的隔膜浸泡在凝固浴中一段时间后取出，然后通过热压处理除去大部分水分后通过真空干燥至水分完全去除，即得所述纤维素涂布锂离子电池隔膜。本发明制备过程不使用有毒有机溶剂，绿色环保，制备的隔膜为可完全降解隔膜，厚度25‑65μm，孔隙率65‑85%，电解液吸收率大于400%，离子导电率大于1.5 mS cm‑1，热稳定性良好，200℃条件下3 h尺寸变化率小于0.1%。
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