Surface modification of vertically aligned graphene nanosheets by microwave assisted etching for application as anode of lithium ion battery

Ghosh, Monalisa and Venkatesh, G and Rao, Mohan G (2016) Surface modification of vertically aligned graphene nanosheets by microwave assisted etching for application as anode of lithium ion battery. In: SOLID STATE IONICS, 296 . pp. 31-36.

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Abstract

Vertically aligned graphene nanosheets (VAGNS) are grown by plasma enhanced chemical vapor deposition (PECVD) using electron cyclotron resonance (ECR) plasma system for application as an anode material in lithium ion battery (LIB). Microwave assisted etching, in presence and absence of substrate bias, is carried out on as grown VAGNS films to modify the morphology of the film. Scanning electron microscopy (SEM) is used for characterizing the surface features of the VAGNS films. The VAGNS sample which is microwave plasma treated (power 400 W) with substrate bias of 100 V, showed an initial charging specific capacity of 223 mu Ah.cm(-2).mu m(-1), while as deposited VAGNS showed specific capacity of 124.4 mu Ah.cm(-2).mu m(-1). After 5 cycles, while the former showed a specific capacity of 68.1 mu Ah.cm(-2).mu m(-1) (760.7 mAh g(-1)), while the later showed a specific capacity of 43.9 mu Ah.cm(-2).mu m(-1)(458.7 mAh.g(-1)). During discharge initially while surface modified VAGNS showed a capacity of 100.1 mu Ah.cm(-2).mu m(-1), the as deposited VAGNS showed a capacity of 38.2 mu Ah.cm(-2).mu m(-1). The specific capacity after five cycles, during discharge for modified VAGNS is 68 mu Ah.cm(-2).mu m(-1) (725.9 mAh g(-1)), and for as deposited VAGNS it is 34 mu Ah.cm(-2).mu m(-1)(380.6 mAh.g(-1)). The specific capacity remains fairly constant after this initial capacity loss up to 50 cycles. The results indicate that surface modification of VAGNS improves the performance of the material as anode for lithium ion battery. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	SOLID STATE IONICS
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Dec 2016 04:39
Last Modified:	07 Dec 2016 04:39
URI:	http://eprints.iisc.ac.in/id/eprint/55458

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