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ID 34190
FullText URL
Author
Maeda, Mariko
Nagai, Aisaku
Goto, Atsushi
Tansho, Masataka
Hashi, Kenjiro
Shimizu, Tadashi
Abstract

The state of lithium in a novel hard-carbon optimized to the anode of large size Li ion secondary battery, which has been recently commercialized, was investigated and compared with other existing hard-carbon samples by 7Li NMR method. The new carbon material showed a peak at 85 ppm with a shoulder signal at 7 ppm at room temperature in static NMR spectrum, and the former shifted to 210 ppm at 180 K. The latter at room temperature was attributed to Li doped in small particles contained in the sample. The new carbon sample showed weaker intensity of cluster-lithium signal than the other hard-carbon samples in NMR, which corresponded to a tendency of less "Constant Voltage" (CV) capacity in charge-discharge curves of electrochemical evaluation. Smaller CV capacity and initial irreversible capacity, which are the features of the novel hard-carbon, are considered to correspond to a blockade of the diffusion of Li into pore of carbon.

Keywords
hard carbon
Lithium
battery
7Li NMR
anode
electric vehicle
Note
Digital Object Identifer:10.1016/j.jpowsour.2006.09.001
Published with permission from the copyright holder. This is the institute's copy, as published in Journal of Power Sources, October 2006, Volume 162, Issue 2, Pages 1322-1328.
Publisher URL:http://dx.doi.org/10.1016/j.jpowsour.2006.09.001
This newest article has not been indexed to the Web of ScienceTM yet. After the library member confirms the WoS record of this article, the WoS link is made on the bibliographic data later. Copyright © 2006 Elsevier B.V. All rights reserved.
Published Date
2006-10
Publication Title
Journal of Power Sources
Volume
volume162
Issue
issue2
Start Page
1322
End Page
1328
Content Type
Journal Article
language
英語
Refereed
True
DOI
Submission Path
physical_and_theoretical_chemistry/27