Performance of Sn-based Negative Electrode Films Prepared by Electrostatic Spray Deposition in Lithium Batteries

• Published in: Denki kagaku oyobi kōgyō butsuri kagaku Vol. 80; no. 10; pp. 821 - 824
• Main Authors: Koike, S, Kobayashi, H
• Format: Journal Article
• Language: English
• Published: 01.10.2012
• Subjects: Binders; Electrodes; Electrostatics; Lithium batteries; Spray deposition; Tin; Tin dioxide; Tin oxides
• ISSN: 1344-3542
• DOI: 10.5796/electrochemistry.80.821

SnO sub(2) and CuSnO sub(2) were successfully sprayed onto a Ni substrate using electrostatic spray deposition to produce negative electrode films with highly porous morphologies for use in lithium batteries. The spray-deposited SnCl sub(2) decomposed to Sn during heat treatment at 230 degree C under inert atmosphere and then was oxidized to SnO sub(2) being exposed to the air. The resultant SnO sub(2) film, which did not contain any additives such as binders or conductive additives, was used as a negative electrode. At the beginning of some charge-discharge cycles, the SnO sub(2) film achieved a capacity of 780 mAh g super(-1), which was close to its theoretical capacity. However, its capacity subsequently decreased because of crystal growth during the Li alloying-dealloying process. The capacity retention of the film was improved by adding Cu to the precursor solution. Although the initial capacity of the CuSnO sub(2) film was lower than that of the SnO sub(2) film, the CuSnO sub(2) film displayed better cycle performance; i.e., it possessed more than double the capacity of the SnO sub(2) film after 100 cycles.