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Nanocrystalline and Thin Film Germanium Electrodes with High Lithium Capacity and High Rate Capabilities

Graetz, J. and Ahn, C. C. and Yazami, R. and Fultz, B. (2004) Nanocrystalline and Thin Film Germanium Electrodes with High Lithium Capacity and High Rate Capabilities. Journal of the Electrochemical Society, 151 (5). A698-A702. ISSN 0013-4651. http://resolver.caltech.edu/CaltechAUTHORS:GRAjes04

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Abstract

Germanium nanocrystals (12 nm mean diam) and amorphous thin films (60-250 nm thick) were prepared as anodes for lithium secondary cells. Amorphous thin film electrodes prepared on planar nickel substrates showed stable capacities of 1700 mAh/g over 60 cycles. Germanium nanocrystals showed reversible gravimetric capacities of up to 1400 mAh/g with 60% capacity retention after 50 cycles. Both electrodes were found to be crystalline in the fully lithiated state. The enhanced capacity, rate capability (1000C), and cycle life of nanophase germanium over bulk crystalline germanium is attributed to the high surface area and short diffusion lengths of the active material and the absence of defects in nanophase materials.


Item Type:Article
Additional Information:©2004 The Electrochemical Society. Manuscript submitted August 18, 2003; revised manuscript received November 6, 2003. Available electronically March 23, 2004. This work was supported by the Department of Energy through Basic Energy Sciences Grant no. DE-FG03-00ER15035. The authors assisted in meeting the publication costs of this article.
Subject Keywords:germanium; elemental semiconductors; nanostructured materials; amorphous semiconductors; semiconductor thin films; electrochemistry; electrochemical electrodes; secondary cells
Record Number:CaltechAUTHORS:GRAjes04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GRAjes04
Alternative URL:http://dx.doi.org/10.1149/1.1697412
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8804
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:18 Sep 2007
Last Modified:26 Dec 2012 09:42

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