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Active and Passive Electronic Components
Volume 19, Issue 3, Pages 189-198
http://dx.doi.org/10.1155/1996/38096

Particle Size Dependence of TiO2 Electrodes in Rechargeable Lithium Battery

1National Renewable Energy Laboratory, 1617 Cole Bld, Golden CO80401-3393, USA
2Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université Bordeaux I, Château Brivazac, Ave du Dr. A. Schweitzer, Pessac 33600, France
3Laboratoire d'Ingéniére des Matériaux et des Hautes Pressions, CNRS, Institut Galilée, Université Paris Nord, Avenue J.B. Clément, Villetaneuse F93430, France

Received 5 October 1995; Accepted 25 January 1996

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Particle size effects in five anatase TiO2 pellet electrodes with different particle sizes (4 ∼ 300nm) and surface areas (8 ∼ 380m2/g) were studied by XRD analysis, chronopotentiometry and chronoamperometry in Li/LiN(CF3SO2)2 + EC:DME/TiO2 cells. Nanosized TiO2 electrodes showed by 22% larger storage capacity, 50% lower overvoltage loss at the same current density, and 75% higher charge density for a given time than microsized ones; electric storage capacity enhances more rapidly with decreasing particle size and increasing surface area in a nanoscale region than in a microscale region. The particle size dependence may be explained by surface morphology of electrodes and existence of structural defects or distortion in the surface layer of TiO2 nanosized particles.