PAN-LATP复合固态电解质的制备与性能表征

Preparation and characterization of PAN-LATP composite solid-state electrolyte

与传统的液态电解质相比,固态聚合物电解质可以显著提高锂二次电池的安全性和能量密度,但其室温锂离子传导率低、机械性能比较差,这些缺点限制了固态聚合物电解质在锂二次电池中的应用.为了解决上述问题,本文采用溶液浇铸法在聚丙烯腈(PAN)固态聚合物电解质中引入无机固态电解质Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3(LATP)制备了PAN-LATP复合固态电解质(CSE).该复合固态电解质不仅具有较高的锂离子电导率,还拓宽了电化学稳定窗口.当LATP含量为15%时CSE的锂离子传导率最高,室温下为2.14×10^(-5)S/cm,333 K时为3.03×10^(-4)S/cm.与此同时,固态聚合物电解质的机械强度也得到了很好的改善.结果表明该性能优良的固态电解质有望用于锂离子电池和其他电化学储能系统.

Compared with the traditional liquid electrolyte, the solid polymer electrolyte can significantly improve the safety and energy density of the lithium secondary batteries, but its room temperature lithium ion conductivity is low and the mechanical properties are relatively poor. These problems limit the application of solid polymer electrolytes in lithium secondary batteries. In order to solve the above problems, PAN-LATP composite solid electrolyte （CSE） was prepared by solution casting method in polyacrylonitrile （PAN） polymer electrolyte to introduce inorganic solid-state electric Lil.3A10.aTil.7（PO4）3 （LATP）. The composite solid electrolyte not only has higher lithium ion conductivity, but also broadens the electrochemical stability window of the solid polymer electrolyte. When the LATP content was 15%, the CSE has the highest lithium ion conductivity, which was 2.14×10^-5 S/cm at room temperature and 3.03×10^-4 S/cm at 333 K. At the same time, the mechanical strength of the solid polymer electrolyte has also been improved. The results show that the solid electrolyte with good performance is expected to be used in lithium-ion batteries and other electrochemical energy storage systems.