摘要锂离子电池隔膜位于锂离子电池正负极之间，目的是为了防止正负极直接接 触，也作为锂离子正负电极间的传输通道。它的材质和纳米结构严重影响电池界 面性能和内阻等参数。电纺纳米纤维膜的高孔隙率使其能大大提高锂离子电池的 电池性能，未来将成为隔膜的主要形式之一，但其纳米纤维排列杂乱、纳米纤维 膜孔径大小不均匀限制了其作为锂离子电池隔膜方面的应用，论文围绕此方面展 开研究。77966

针对此问题，本次毕业设计通过对聚酰亚胺（PI）前驱体聚酰胺酸（PAA） 进行静电纺丝，通过二步法制得 PI 纳米纤维膜。通过实验确定合成聚酰胺酸最 佳实验条件和电纺 PAA 的最佳工艺条件，制备直径均匀地 PI 纤维。并且通过对 静电纺接收装置进行改装，纺制十字交叉型的纳米纤维，研究结果表明：在电纺 工艺上，采用 25%浓度的纺丝液、18kv 电压、15cm 纺丝距离制备的纳米纤维直 径均匀。这种具有一定定向性的纳米纤维制成纤维膜孔径均匀、孔隙率高，从而 具有优异的浸润性，非常适合应用在锂电池隔膜领域。因为制备简单，在锂电隔 膜方面很有发展潜力。

毕业论文关键词 静电纺丝；锂离子电池隔膜；聚酰亚胺

Title Development of lithium-ion battery separator based on electrospun fibers   

Abstract Separator located between lithium ion battery positive and negative, in  order to prevent direct contact with the positive and negative, and it a lithium ion positive and negative transmission channel between the electrodes。 Its structure and interface structure seriously affect the battery internal resistance。 Because of the high porosity of Electrospun nano-fibrous membrane, the Li-ion battery with this separator has improvement in battery performances, and it may become one of the main forms of separator in the future。 But its nano fiber arrangement messy, uneven nanofiber membrane pore size limits its lithium-ion battery separator aspects of the application, the main work of this paper is around these aspects。

In this paper, polyimide (PI) precursor polyamic acid (PAA) electrostatic spinning, by a two-step method were PI nano-fiber membrane。 The polyamic acid synthesized experimentally determined the optimum conditions and electrospun PAA optimum conditions to prepare a uniform diameter PI fibers。 Through the electrostatic spinning receiving device modification, cross-type spun nanofibers。 The results show：

In the electrospinning process, using 25% concentration dope, 18kv voltage, uniform nanofiber spun from 15cm in diameter prepared。 The scaffold has a certain orientation of the fiber membrane made of uniform pore size, porosity, and thus has excellent wettability, very suitable for application in the field of lithium battery separator。 Because simple preparation, in terms of lithium pide great potential for development。

Keywords: Electrospinning  ；Lithium ion battery separator ；Polyimide

目 次

1 绪论 1

1。 1 静电纺丝技术概述 1

1。2 锂离子电池隔膜概述 3

1。3 聚酰亚胺 3

1。4 锂离子电池隔膜的现状及研究意义