Combinatorial arrays and parallel screening for positive electrode discovery
- 1 June 2003
- journal article
- Published by Elsevier BV in Journal of Power Sources
- Vol. 119-121, 778-783
- https://doi.org/10.1016/s0378-7753(03)00252-0
Abstract
Combinatorial techniques have been applied to the preparation and screening of positive electrode candidates for lithium batteries. This work describes the automated parallel synthesis of 64-electrode arrays using a Packard Multiprobe II liquid handling system. A cell was constructed with a single lithium reference–counter electrode and 64, three-millimeter-diameter working electrodes containing LixMn2O4 active material, PVdF–HFP binder and carbon black as a conducting additive. Eight duplicate electrodes, each of eight respective compositions, were deposited on the array and the mass fraction of carbon was varied in steps from 1 to 25%. The results showed a rapid increase in capacity at the percolation limit of 3% for most cells. Some groups of nominally identical cells showed random variations in capacity, especially at low carbon loadings. The overall result is a demonstration of advantages of the combinatorial concept, which were time-saving and an improved statistical significance of the results compared with on–off experiments.Keywords
This publication has 6 references indexed in Scilit:
- Development of Robot System and X-ray Powder Diffraction for Combinatorial Materials ResearchMRS Proceedings, 2001
- The Role of Carbon Black in LiMn[sub 2]O[sub 4]-Based Composites as Cathodes for Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 2001
- The Effect of Co Substitution for Ni on the Structure and Electrochemical Behavior of T2 and O2 Structure Li[sub 2/3][Co[sub x]Ni[sub 1/3−x]Mn[sub 2/3]]O[sub 2]Journal of the Electrochemical Society, 2001
- Anomalous percolation transition in carbon-black–epoxy composite materialsPhysical Review B, 1999
- Combinatorial Chemistry—Challenge and Chance for the Development of New Catalysts and MaterialsAngewandte Chemie-International Edition, 1999
- Combinatorial Electrochemistry: A Highly Parallel, Optical Screening Method for Discovery of Better ElectrocatalystsScience, 1998