A Parallel Bicomponent TPU/PI Membrane with Mechanical Strength Enhanced Isotropic Interfaces Used as Polymer Electrolyte for Lithium-Ion Battery
A Parallel Bicomponent TPU/PI Membrane with Mechanical Strength Enhanced Isotropic Interfaces Used as Polymer Electrolyte for Lithium-Ion Battery
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具有机械强度增强各向同性界面的平行双组分 TPU/PI 膜用作锂离子电池聚合物电解质
DOI：
10.3390/polym11010185
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发表时间：
2019-01-01
期刊：
影响因子：
5
通讯作者：
Zhao, Jinbao
中科院分区：
文献类型：
--
作者：
Cai, Ming;Zhu, Jianwei;Zhao, Jinbao
本文首次报道了用静电纺丝法制备的热塑性聚氨酯/聚酰亚胺（TPU/PI）并列型双组分聚合物电解质。TPU和PI共存在于一根纤维上，并通过两种溶液相互扩散形成的界面过渡层连接。这种结构的TPU/PI聚合物电解质既具有高耐热性的PI的优点，又具有高机械强度的TPU的优点，而且各向同性的界面过渡层进一步提高了TPU的机械强度。此外，得益于微纳米孔和结构的高孔隙率，TPU/PI聚合物电解质在室温下具有高电解质吸收率（665%）和优异的离子电导率（5.06 mS·cm−1）。与PE隔膜相比，TPU/PI聚合物电解质具有更好的电化学稳定性，将其作为电解质和隔膜组装的Li/LiMn 2 O 4电池具有低内阻、稳定的循环和显著的高倍率性能。研究表明，TPU/PI膜是一种很有前途的高安全性锂离子电池聚合物电解质。
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−1) 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.