Journal
JOURNAL OF POWER SOURCES
Volume 144, Issue 1, Pages 197-203Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2004.12.047
Keywords
Li-Sn alloy anode; Sn-SnO2 mixtures; capacity fade; irreversible capacity
Ask authors/readers for more resources
Anodes derived from oxides of tin have, of late, been of considerable interest because, in principle, they can store over twice as much lithium as graphite. A nanometric matrix of Li2O generated in situ by the electrochemical reduction of SnO2 can provide a facile environment for the reversible alloying of lithium with tin to a maximum stoichiometry of Li4.4Sn. However, the generation of the matrix leads to a high first-cycle irreversible capacity. With a view to increasing the reversible capacity as well as to reduce the irreversible capacity and capacity fade upon cycling, tin-tin oxide mixtures were investigated. SnO2, synthesized by a chemical precipitation method, was mixed with tin powder at two compositions, viz., 1:2 and 2: 1, ball-milled and subjected to cycling studies. A mixture of composition Sn:SnO2 = 1:2 exhibited a specific capacity of 549 mAh g(-1) (13% higher than that for SnO2) with an irreversible capacity, which was 7% lower than that for SnO2 and a capacity fade of 1.4 mAh g(-1) cycle(-1). Electrodes with this composition also exhibited a coulombic efficiency of 99% in the 40 cycles. It appears that a matrix in which tin can be distributed without aggregation is essential for realizing tin oxide anodes with high cyclability. (c) 2005 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available