Issue 9, 2016

A self-assembled intercalated metal–organic framework electrode with outstanding area capacity for high volumetric energy asymmetric capacitors

Abstract

The enhancement of the energy of electrochemical capacitors while maintaining high power, long-term cycle stability and safety is challenging. Although there are several types of capacitors that realize high energy density, a system that achieves high energy with safety is still desired. Here we introduce a novel asymmetric capacitor with a negative electrode consisting of an intercalated metal–organic framework (iMOF) composed of 2,6-naphthalene dicarboxylate dilithium, which exhibits a flat plateau near 0.8 V vs. Li/Li+, suitable for high voltage as well as safety. Furthermore, for high volumetric energy density, we propose an extremely thick iMOF electrode prepared by self-assembly of the active material and conductive nanocarbon with an amphiphilic polymer, which possess efficient electron and Li+ transport pathways, and therefore exhibited an outstanding area capacity of over 2.5 mA h cm−2. Asymmetric capacitors with iMOF negative and activated carbon positive electrodes exhibited a high volumetric energy of 60 W h L−1 with favorable power and cycle stability.

Graphical abstract: A self-assembled intercalated metal–organic framework electrode with outstanding area capacity for high volumetric energy asymmetric capacitors

Supplementary files

Article information

Article type
Paper
Submitted
24 Nov 2015
Accepted
26 Jan 2016
First published
26 Jan 2016
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2016,4, 3398-3405

Author version available

A self-assembled intercalated metal–organic framework electrode with outstanding area capacity for high volumetric energy asymmetric capacitors

N. Ogihara, Y. Ozawa and O. Hiruta, J. Mater. Chem. A, 2016, 4, 3398 DOI: 10.1039/C5TA09559J

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