Cai Ming, Zhu Jianwei, Yang Chaochao, Gao Ruoyang, Shi Chuan, Zhao Jinbao
College of Physics, Qingdao University, Qingdao 266071, China.
College of Textiles & Clothing, Industrial Research Institute of Nonwovens & Technical Textiles, Qingdao University, Qingdao 266071, China.
Polymers (Basel). 2019 Jan 21;11(1):185. doi: 10.3390/polym11010185.
In this work, a side-by-side bicomponent thermoplastic polyurethane/polyimide (TPU/PI) polymer electrolyte prepared with side-by-side electrospinning method is reported for the first time. Symmetrical TPU and PI co-occur on one fiber, and are connected by an interface transition layer formed by the interdiffusion of two solutions. This structure of the as-prepared TPU/PI polymer electrolyte can integrate the advantages of high thermal stable PI and good mechanical strength TPU, and mechanical strength is further increased by those isotropic interface transition layers. Moreover, benefiting from micro-nano pores and the high porosity of the structure, TPU/PI polymer electrolyte presents high electrolyte uptake (665%) and excellent ionic conductivity (5.06 mS·cm) at room temperature. Compared with PE separator, TPU/PI polymer electrolyte exhibited better electrochemical stability, and using it as the electrolyte and separator, the assembled Li/LiMn₂O₄ cell exhibits low inner resistance, stable cyclic and notably high rate performance. Our study indicates that the TPU/PI membrane is a promising polymer electrolyte for high safety lithium-ion batteries.
在本工作中，首次报道了采用并列静电纺丝法制备的并列双组分热塑性聚氨酯/聚酰亚胺（TPU/PI）聚合物电解质。对称的TPU和PI共存于一根纤维上，并通过两种溶液相互扩散形成的界面过渡层相连。所制备的TPU/PI聚合物电解质的这种结构可以整合高热稳定性PI和良好机械强度TPU的优点，并且那些各向同性的界面过渡层进一步提高了机械强度。此外，受益于微纳孔和结构的高孔隙率，TPU/PI聚合物电解质在室温下呈现出高吸液率（665%）和优异的离子电导率（5.06 mS·cm）。与PE隔膜相比，TPU/PI聚合物电解质表现出更好的电化学稳定性，将其用作电解质和隔膜时，组装的Li/LiMn₂O₄电池具有低内阻、稳定的循环性能和显著的高倍率性能。我们的研究表明，TPU/PI膜是一种用于高安全性锂离子电池的有前景的聚合物电解质。
