A Novel Electrospinning Polyacrylonitrile Separator with Dip-Coating of Zeolite and Phenoxy Resin for Li-ion Batteries.

Danxia Chen,Weiping Chen,Ze Zhang,Xiang Wang,Jianyu Liang

doi:10.3390/membranes11040267

Danxia Chen, Weiping Chen + Show 3 more

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https://doi.org/10.3390/membranes11040267

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Abstract

Commercial separators (polyolefin separators) for lithium-ion batteries still have defects such as low thermostability and inferior interface compatibility, which result in serious potential safety distress and poor electrochemical performance. Zeolite/Polyacrylonitrile (Z/PAN) composite separators have been fabricated by electrospinning a polyacrylonitrile (PAN) membrane and then dip-coating it with zeolite (ZSM-5). Different from commercial separators, the Z/PAN composite separators exhibit high electrolyte uptake, excellent ionic conductivity, and prominent thermal stability. Specifically, the Z/PAN-1.5 separator exhibits the best performance, with a high electrolyte uptake of 308.1% and an excellent ionic conductivity of 2.158 mS·cm−1. The Z/PAN-1.5 separator may mechanically shrink less than 10% when held at 180 °C for 30 min, proving good thermal stability. Compared with the pristine PAN separator, the Li/separator/LiFePO4 cells with the Z/PAN-1.5 composite separator have excellent high-rate discharge capacity (102.2 mAh·g−1 at 7 C) and favorable cycling performance (144.9 mAh·g−1 at 0.5 C after 100 cycles). Obviously, the Z/PAN-1.5 separator holds great promise in furthering the safety and performance of lithium-ion batteries.

Highlights

As a high-efficiency energy storage system, lithium-ion batteries have excellent performance such as greater energy density, high operational voltage, long cycle life, and low self-discharge rate
The results show that the composite separator has excellent mechanical strength and electrochemical properties
A T-O-T (T=Si or Al) bending vibration peak of ZSM-5 appeared at 553 cm−1, indicating that ZSM-5 is normally embedded into the Z/PAN-1.5 separators [33]

Summary

Introduction

As a high-efficiency energy storage system, lithium-ion batteries have excellent performance such as greater energy density, high operational voltage, long cycle life, and low self-discharge rate. They have been widely used in mobile phones, intelligent speakers, notebook computers, electric scooters, and other portable electronic equipment [1,2,3,4,5,6]. Lithium-ion batteries usually are formed from cathodes, anodes, separators, and electrolytes. It is essential to develop a separator with prominent thermal stability and excellent wettability for lithium-ion battery applications [13,14]

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