The effect of the morphology of Lyocell fibrillated fibers with different beating revolutions on pore structure and electrochemical properties of Lyocell fibrillated fiber paper-based (LF) separators for lithium-ion batteries is investigated. With raising the beating revolutions from 50,000 to 600,000, the number of coarse fibers decreases from 7851 to 743, and the mean fiber diameter decreases from 374 nm to 171 nm. Both the number of coarse fibers and the mean fiber diameter have good correlation with the thickness, pore size and porosity of the LF separators. The risk of battery short circuit is increased, if the mean pore size of separators is larger than the minimum size of cathode particles. Compared to the PE and PI separators, the LF separators deliver excellent cycle performance with different current densities at 30 °C owing to their larger pore size, porosity, and better electrolyte affinity. However, the cycle performance deteriorates at −10 °C due to the severe local lithium plating on the graphite surface caused by a large number of coarse fibers with a diameter ranging from 5 μm to 15 μm as local microscopic defects.

研究了不同拍打转数的莱赛尔原纤化纤维的形态对锂离子电池用莱赛尔原纤化纸基（LF）隔膜的孔结构和电化学性能的影响。随着拍打次数从50,000增加到600,000，粗纤维的数量从7851减少到743，平均纤维直径从374 nm减少到171 nm。粗纤维的数量和平均纤维直径均与LF隔板的厚度，孔径和孔隙率具有良好的相关性。如果隔板的平均孔径大于阴极颗粒的最小尺寸，则会增加电池短路的风险。与PE和PI分隔器相比，LF隔膜具有较大的孔径，孔隙率和更好的电解质亲和力，因此在30°C的不同电流密度下均具有出色的循环性能。但是，由于大量的直径为5μm至15μm的粗纤维作为局部微观缺陷而导致石墨表面上严重的局部锂镀覆，因此循环性能在-10℃下劣化。