Performance Improvement of Surface-Modified LiCoO2 Cathode Materials: An Infrared Absorption and X-Ray Photoelectron Spectroscopic Investigation
Authors:
- 2 January 2003
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 150 (2) , A199-A208
Abstract
Comparative study has been carried out by Fourier transform infrared and X-ray photoelectron spectroscopy to understand the electrochemical performance improvement of nanometer-sized magnesium oxide (nano-MgO) modified commercial LiCoO 2 ( MgO / LiCoO 2 ) cathode materials for lithium-ion batteries. It is found that the configuration of the solvent molecules of the electrolyte are very sensitive to the disturbance of nano-MgO and commercial LiCoO 2 . Modifying the surface of commercial LiCoO 2 particles with nano-MgO can suppress such chemical reactions on the electrode surface significantly. In addition, by hindering the formation of oxygen with high oxidizing power and by physically separating the electrolyte from direct contact with the active cathode material, surface coating suppresses the interaction between LiCoO 2 and the electrolyte at the uncharged state and alleviates the electrolyte decomposition at charged states. © 2002 The Electrochemical Society. All rights reserved.Keywords
This publication has 34 references indexed in Scilit:
- Surface Analysis of LiMn[sub 2]O[sub 4] Electrodes in Carbonate-Based ElectrolytesJournal of the Electrochemical Society, 2002
- Formation of SEI on Cycled Lithium-Ion Battery Cathodes: Soft X-Ray Absorption StudyElectrochemical and Solid-State Letters, 2002
- A FTIR and Raman study of spontaneous reactions occurring at the LiNiyCo(1−y)O2 electrode/non-aqueous electrolyte interfaceJournal of Power Sources, 2001
- The Reaction of Charged Cathodes with Nonaqueous Solvents and Electrolytes: II. LiMn[sub 2]O[sub 4] charged to 4.2 VJournal of the Electrochemical Society, 2001
- The Reaction of Charged Cathodes with Nonaqueous Solvents and Electrolytes: I. Li[sub 0.5]CoO[sub 2]Journal of the Electrochemical Society, 2001
- Electrochemical and Infrared Studies of the Reduction of Organic CarbonatesJournal of the Electrochemical Society, 2001
- Modification of LixNi1−yCoyO2 by applying a surface coating of MgOJournal of Power Sources, 2000
- Electrochemical Quartz Crystal Microbalance Investigations of LiMn[sub 2]O[sub 4] Thin Films at Elevated TemperaturesJournal of the Electrochemical Society, 2000
- Common Electroanalytical Behavior of Li Intercalation Processes into Graphite and Transition Metal OxidesJournal of the Electrochemical Society, 1998
- AC Impedance Analysis of Polycrystalline Insertion Electrodes: Application to Li1 − x CoO2Journal of the Electrochemical Society, 1985