Porous membrane with high curvature, three-dimensional heat-resistance skeleton: a new and practical separator candidate for high safety lithium ion battery.

Junli Shi,Xianfeng Li,Zhaoping Liu,Yonggao Xia,Huamin Zhang,Zhizhang Yuan,Huasheng Hu

doi:10.1038/srep08255

Abstract

Separators with high reliability and security are in urgent demand for the advancement of high performance lithium ion batteries. Here, we present a new and practical porous membrane with three-dimension (3D) heat-resistant skeleton and high curvature pore structure as a promising separator candidate to facilitate advances in battery safety and performances beyond those obtained from the conventional separators. The unique material properties combining with the well-developed structural characteristics enable the 3D porous skeleton to own several favorable properties, including superior thermal stability, good wettability with liquid electrolyte, high ion conductivity and internal short-circuit protection function, etc. which give rise to acceptable battery performances. Considering the simply and cost-effective preparation process, the porous membrane is deemed to be an interesting direction for the future lithium ion battery separator.

Highlights

Porous membrane with high curvature, three-dimensional heat-resistance skeleton: a new and practical separator candidate for high safety lithium ion battery
Since battery performances are going to be evaluated the Polyether imide (PEI) based skeleton/membrane will be coded as the PEI based separator in the following discussions
The self-discharge properties of the cells were determined by evaluating the open-circuit voltage (OCV) drop and capacity decay, which could in turn predict internal short-circuits between electrodes[3]

Summary

Introduction

Porous membrane with high curvature, three-dimensional heat-resistance skeleton: a new and practical separator candidate for high safety lithium ion battery. We present a new and practical porous membrane with three-dimension (3D) heat-resistant skeleton and high curvature pore structure as a promising separator candidate to facilitate advances in battery safety and performances beyond those obtained from the conventional separators. The unique material properties combining with the well-developed structural characteristics enable the 3D porous skeleton to own several favorable properties, including superior thermal stability, good wettability with liquid electrolyte, high ion conductivity and internal short-circuit protection function, etc. The report highlights our effort to construct a new class of battery separator that features 3D heat-resistance skeleton to enhanced battery thermal safety and high curvature pore structure to play in internal short circuit protection function, to overcome the shortcomings of conventional separators

Methods

Results

Conclusion