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Issue 11, 2012
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Second generation ‘nanohybrid supercapacitor’: Evolution of capacitive energy storage devices

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Abstract

Nanoscience and nanotechnology can provide tremendous benefits to electrochemical energy storage devices, such as batteries and supercapacitors, by combining new nanoscale properties to realize enhanced energy and power capabilities. A number of published reports on hybrid systems are systematically reviewed in this perspective. Several potential strategies to enhance the energy density above that of generation-I electric double layer capacitors (EDLC: activated carbon/activated carbon) are discussed and some fundamental issues and future directions are identified. We suggest a new hybrid supercapacitor system that is able to meet the energy and power demands for a variety of applications, ranging from microelectronic devices to electrical vehicles, which presents itself as a breakthrough improvement. Two practical hybrid supercapacitor systems, namely, a lithium-ion capacitor (LIC: graphite/activated carbon) and a nanohybrid capacitor (NHC: (nc-Li4Ti5O12/CNF composite)/activated carbon), are featured and compared. The proposed NHC can pave the way toward generation-II supercapacitor systems by taking advantage of a novel, high quality, high efficiency and inexpensive nanomaterial preparation procedure. With such a breakthrough in nanofabrication–nanohybridization technology, the NHC, which utilizes an ultrafast nano-crystalline Li4Ti5O12, is considered to be an alternative for conventional generation-I EDLCs.

Graphical abstract: Second generation ‘nanohybrid supercapacitor’: Evolution of capacitive energy storage devices

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Article information


Submitted
19 Mar 2012
Accepted
09 Aug 2012
First published
14 Sep 2012

Energy Environ. Sci., 2012,5, 9363-9373
Article type
Perspective

Second generation ‘nanohybrid supercapacitor’: Evolution of capacitive energy storage devices

K. Naoi, S. Ishimoto, J. Miyamoto and W. Naoi, Energy Environ. Sci., 2012, 5, 9363
DOI: 10.1039/C2EE21675B

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