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Issue 22, 2015
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Redox-active polyimide–polyether block copolymers as electrode materials for lithium batteries

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Abstract

Redox-active polyimide–polyether multi-block copolymers were synthesized by polycondensation reaction of aromatic dianhydrides with α-ω-diamino poly(ethylene oxide). Polyimide-b-polyether block copolymers showed microphase separation between a hard-polyimide domain and a soft-polyether domain as observed by Atomic Force Microscopy. The block copolymers were investigated as cathodes for polymer/lithium metal batteries. Polymer cathodes were formulated where the block copolymer had a dual role as active material and binder, with a small amount of carbon black (15 wt%). Naphthalene polyimides showed higher discharge voltages, higher specific capacities as well as better cycling performance, compared to pyromellitic polyimides. The longest PEO blocks resulted in a better performance as electrodes. The best performing naphthalene polyimide-b-PEO2000 presented an excellent value of discharge capacity of 170 mA h g−1, stable after 100 cycles at a current density of 1Li+/5 h and considering the polyimide as the active material. The average discharge plateaus were 2.51 V and 2.37 V vs. Li+/Li.

Graphical abstract: Redox-active polyimide–polyether block copolymers as electrode materials for lithium batteries

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Supplementary files

Article information


Submitted
08 Dec 2014
Accepted
30 Jan 2015
First published
02 Feb 2015

This article is Open Access

RSC Adv., 2015,5, 17096-17103
Article type
Paper
Author version available

Redox-active polyimide–polyether block copolymers as electrode materials for lithium batteries

G. Hernández, N. Casado, R. Coste, D. Shanmukaraj, L. Rubatat, M. Armand and D. Mecerreyes, RSC Adv., 2015, 5, 17096
DOI: 10.1039/C4RA15976D

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