Issue 68, 2019

The design of a multifunctional separator regulating the lithium ion flux for advanced lithium-ion batteries

Abstract

Herein, we design a controllable approach for preparing multifunctional polybenzimidazole porous membranes with superior fire-resistance, excellent thermo-stability, and high wettability. Specifically, the recyclable imidazole is firstly utilized as the eco-friendly template for micropores formation, which is an interesting finding and has tremendous potential for low-cost industrial production. The unique backbone structure of the as-prepared polybenzimidazole porous membrane endows the separator with superb thermal dimensional stability at 300 °C. Most significantly, the inherent flame retardancy of polybenzimidazole can ensure the high security of lithium-ion batteries, and the existence of polar groups of imidazole can regulate the Li+ flux and improve the ionic conductivity of lithium ions. Notably, the cell with a polybenzimidazole porous membrane presents higher capability (131.7 mA h g−1) than that of a commercial Celgard membrane (95.4 mA h g−1) at higher charge–discharge density (5C), and it can work normally at 120 °C. The fascinating comprehensive properties of the polybenzimidazole porous membrane with excellent thermal-stability, satisfying wettability, superb flame retardancy and good electrochemical performance indicate its promising application for high-safety and high-performance lithium-ion batteries.

Graphical abstract: The design of a multifunctional separator regulating the lithium ion flux for advanced lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 Oct 2019
Accepted
21 Nov 2019
First published
04 Dec 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 40084-40091

The design of a multifunctional separator regulating the lithium ion flux for advanced lithium-ion batteries

G. Sun, J. Guo, H. Niu, N. Chen, M. Zhang, G. Tian, S. Qi and D. Wu, RSC Adv., 2019, 9, 40084 DOI: 10.1039/C9RA08006F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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