芳砜纶基锂硫电池隔膜的制备及性能研究

Preparation and Properties of Polysulfonamide Based Li-S Batteries Separator

关键词:  芳砜纶  静电排斥  相转化  多硫化物

Key Words:polysulfonamide  electrostatic repulsion  phase transformation  polysulfide

摘要:在不损失芳砜纶（PSA）纤维热稳定条件（200 ℃下收缩率为0）下，使用相转化法制备A-PSA隔膜，其表现出非对称孔结构（正极侧孔径小于2 nm），且碱化处理提高了隔膜电解质浸润性（340.5%）和电负性。通过空间阻隔和静电屏蔽协同策略，限制了多硫化物的穿梭。结果表明，A-PSA隔膜制备的锂硫电池具备较低电化学阻抗和较高离子电导率（1.23 mS/cm），100个循环后容量保持率（89.1%）高于PP隔膜（58.7%）。

Abstract:A-PSA separator was prepared via phase transformation method using aromatic sulfone （PSA） fiber without loss of its thermal stability （shrinkage of 0 at 200 ℃）， which showed asymmetric pore structure （positive side pore size less than 2 nm）. Alkalization treatment improved electrolyte infiltration （340.5%） and electronegativity of the A-PSA separator. The space barrier and electrostatic shielding cooperative strategy was used to limit the shuttle of polysulfide. The results showed that Li-S batteries equipped with A-PSA separator had a lower electrochemical impedance and higher ionic conductivity （1.23 mS/cm）， with the capacity retention rate （89.1%） was higher than that of PP separator （58.7%） after 100 cycles.