Table of Contents Author Guidelines Submit a Manuscript
International Journal of Electrochemistry
Volume 2018, Article ID 4712148, 9 pages
https://doi.org/10.1155/2018/4712148
Research Article

Performance of Novel Randomly Oriented High Graphene Carbon in Lithium Ion Capacitors

Corning Incorporated, 1 Science Drive, Painted Post, NY 14870, USA

Correspondence should be addressed to Rahul S. Kadam; moc.gninroc@srmadak

Received 17 August 2017; Accepted 23 January 2018; Published 1 March 2018

Academic Editor: Jili Li

Copyright © 2018 Rahul S. Kadam and Kishor P. Gadkaree. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The structure of carbon material comprising the anode is the key to the performance of a lithium ion capacitor. In addition to determining the capacity, the structure of the carbon material also determines the diffusion rate of the lithium ion into the anode which in turn controls power density which is vital in high rate applications. This paper covers details of systematic investigation of the performance of a structurally novel carbon, called Randomly Oriented High Graphene (ROHG) carbon, and graphite in a high rate application device, that is, lithium ion capacitor. Electrochemical impedance spectroscopy shows that ROHG is less resistive and has faster lithium ion diffusion rates (393.7 × 10−3 S·s(1/2)) compared to graphite (338.1 × 10−3 S·s(1/2)). The impedance spectroscopy data is supported by the cell data showing that the ROHG carbon based device has energy density of 22.8 Wh/l with a power density of 4349.3 W/l, whereas baseline graphite based device has energy density of 5 Wh/l and power density of 4243.3 W/l. This data clearly shows advantage of the randomly oriented graphene platelet structure of ROHG in lithium ion capacitor performance.