Sustainable materials are increasingly needed in lithium ion batteries in order to reduce their environmental impact and improve their recyclability. This work reports on the production of separators using poly (L-lactic acid) (PLLA) for lithium ion battery applications. PLLA separators were obtained by solvent casting technique, by varying polymer concentration in solution between 8 wt% and 12 wt% in order to evaluate their morphology, thermal, electrical and electrochemical properties. It is verified that morphology and porosity can be tuned by varying polymer concentration and that the separators are thermally stable up to 250 °C. The best ionic conductivity of 1.6 mS/cm was obtained for the PLLA separator prepared from 10 wt% polymer concentration in solution, due to the synergistic effect of the morphology and electrolyte uptake. For this membrane, a high discharge capacity value of 93 mAh/g was obtained at the rate of 1C. In this work, it is demonstrated that PLLA is a good candidate for the development of separator membranes, in order to produce greener and environmentally friendly batteries in a circular economy context.

锂离子电池中越来越需要可持续性材料，以减少其对环境的影响并提高其可回收性。这项工作报告了使用聚（L-乳酸）（PLLA）生产锂离子电池隔膜的情况。通过溶剂浇铸技术获得PLLA隔板，方法是在溶液中的聚合物浓度在8 wt％和12 wt％之间变化，以评估其形态，热，电和电化学性能。证实可以通过改变聚合物浓度来调节形态和孔隙率，并且隔板在高达250°C的温度下具有热稳定性。由于形态和电解质吸收的协同作用，对于由浓度为10 wt％的聚合物溶液制备的PLLA隔膜，可获得1.6 mS / cm的最佳离子电导率。对于该膜，以1℃的速率获得了93mAh / g的高放电容量值。在这项工作中，证明了PLLA是开发隔膜的理想选择，以便在循环经济的背景下生产出更绿色，更环保的电池。