Lithium intercalation into single-walled carbon nanotubes network electrode: Storage mechanisms and impurity effects

Author(s)

Montoro, Luciano Andrey ^[1] ; Matsubara, Elaine Yoshiko ^[2] ; Rosolen, Jose Mauricio ^[2]

Affiliation

^[1] Univ Fed Minas Gerais, Dept Quim, BR-31270901 Belo Horizonte, MG - Brazil

^[2] Univ Sao Paulo, Dept Quim FFCLRP, BR-14040901 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Journal of Power Sources; v. 257, p. 205-212, JUL 1 2014.
• Web of Science Citations: 10

Abstract

This is a detailed study of how impurities can affect the mechanisms of lithium storage in composite electrodes consisting of a three-dimensional single-walled carbon nanotube (SWCNT) bundles network. To remove impurities such as fullerenes, amorphous carbon, catalyst, and nanographite, we submitted the SWCNT bundles to an appropriate chemical treatment before using them to prepare the electrode. Then, we analyzed how this treatment influenced electrode potential, fading capacity, and specific capacity. Additionally, we evaluated the electrode prepared with high-purity SWNCT bundles by galvanostatic intermittent titration, to obtain lithium transport parameters under thermodynamic conditions. We achieved an intrinsic specific capacity of 400 mAh g(-)(-1), for the purified SWCNT bundles prepared by an arc-reactor method. The transport parameters revealed that the electrode underwent electronic transition of the semiconducting-metal type. The chemical diffusion coefficient ranged from 10(-4) to 10(-18)cm(2) s(-1) with decreasing electrode potential. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 10/07681-5 - Development and study of micro/nanostructurated materials of interest for Lithium ion battery and capacitors
• Grantee: Jose Mauricio Rosolen
• Support Opportunities: Regular Research Grants