Radio Frequency Magnetron-Sputtered LiCoPO[sub 4] Cathodes for 4.8 V Thin-Film Batteries
- 1 January 2003
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 150 (12), A1660-A1666
- https://doi.org/10.1149/1.1619987
Abstract
Thin-film batteries employing sputtered LiCoPO4LiCoPO4 cathode layers, Li3.3PO3.8N0.22Li3.3PO3.8N0.22 (LiPON) electrolyte, and Li anode films have been successfully fabricated and tested. The cells exhibit a high-voltage charge/discharge plateau of 4.8 V, with a lower plateau at 2.5 V corresponding to a much higher conductivity phase. Cells fabricated with as-deposited cathode layers are highly resistive and cannot be charged or discharged to appreciable capacities, even at very low rates of approximately C/100. Upon annealing, the films sputtered from the LiCoPO4LiCoPO4 target become discontinuous and take on a granular morphology. X-ray diffraction results show that these grains consist of untextured crystalline LiCoPO4LiCoPO4 on a Pt current collector layer, a finding further supported by the results from subsequent electrochemical analyses. Thin-film batteries fabricated with crystalline LiCoPO4LiCoPO4 cathodes are among the highest voltage thin-film batteries yet reported. © 2003 The Electrochemical Society. All rights reserved.Keywords
This publication has 24 references indexed in Scilit:
- A Combinatorial Study of Li[sub y]Mn[sub x]Ni[sub 2−x]O[sub 4] Cathode Materials Using Microfabricated Solid-State Electrochemical CellsJournal of the Electrochemical Society, 2003
- Improvement of electrochemical properties of LiNi0.5Mn1.5O4 spinelJournal of Power Sources, 2002
- Reducing Carbon in LiFePO[sub 4]/C Composite Electrodes to Maximize Specific Energy, Volumetric Energy, and Tap DensityJournal of the Electrochemical Society, 2002
- Thin-film lithium and lithium-ion batteriesSolid State Ionics, 2000
- Nanocrystalline Li x Mn2 − y O 4 Cathodes for Solid‐State Thin‐Film Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 1999
- Preparation and electrochemical investigation of LiMn2 − xMexO4 (Me: Ni, Fe, and x = 0.5, 1) cathode materials for secondary lithium batteriesJournal of Power Sources, 1997
- Phospho‐olivines as Positive‐Electrode Materials for Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 1997
- Electrochemical Behavior of LiMn2 O 4 and LiCoO2 Thin Films Produced with Pulsed Laser DepositionJournal of the Electrochemical Society, 1996
- 5 Volt Plateau in LiMn2 O 4 Thin FilmsJournal of the Electrochemical Society, 1995
- Thin-film cathodes for secondary lithium batteriesJournal of Power Sources, 1995