Electrochemical Performance of Sol-Gel Synthesized LiFePO[sub 4] in Lithium Batteries
- 1 January 2004
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 151 (8) , A1279-A1285
- https://doi.org/10.1149/1.1768546
Abstract
LiFePO4,LiFePO4, Li0.98Mg0.01FePO4,Li0.98Mg0.01FePO4, and Li0.96Ti0.01FePO4Li0.96Ti0.01FePO4 were synthesized via a sol-gel method using a variety of processing conditions. For comparison, LiFePO4LiFePO4 was also synthesized from iron acetate by a solid-state method. The electrochemical performance of these materials in lithium cells was evaluated and correlated to LiFePO4LiFePO4 powder morphology and residual carbon structure, as determined by Raman microprobe spectroscopy. For materials with mean agglomerate sizes below 20 μm, an association between structure and crystallinity of the residual carbon and improved utilization was observed. Addition of small amounts of organic compounds or polymers during processing results in carbon coatings with higher graphitization ratios and better electronic properties on the LiFePO4LiFePO4 samples and improves cell performance in some cases, even though total carbon contents remain low (LiFePO4LiFePO4 electrodes without unduly compromising energy density by optimizing the carbon coating on the particles. © 2004 The Electrochemical Society. All rights reserved.Keywords
This publication has 15 references indexed in Scilit:
- Effect of Surface Carbon Structure on the Electrochemical Performance of LiFePO[sub 4]Electrochemical and Solid-State Letters, 2003
- On the way to the optimization of Li3Fe2(PO4)3 positive electrode materialsSolid State Sciences, 2002
- A New Synthetic Route for Preparing LiFePO[sub 4] with Enhanced Electrochemical PerformanceJournal of the Electrochemical Society, 2002
- Reducing Carbon in LiFePO[sub 4]/C Composite Electrodes to Maximize Specific Energy, Volumetric Energy, and Tap DensityJournal of the Electrochemical Society, 2002
- Characterization of LiFePO4 as the cathode material for rechargeable lithium batteriesJournal of Power Sources, 2001
- Approaching Theoretical Capacity of LiFePO[sub 4] at Room Temperature at High RatesElectrochemical and Solid-State Letters, 2001
- Optimized LiFePO[sub 4] for Lithium Battery CathodesJournal of the Electrochemical Society, 2001
- Phthalocyanine-containing polymersJournal of Materials Chemistry, 2000
- Lithium extraction/insertion in LiFePO4: an X-ray diffraction and Mössbauer spectroscopy studySolid State Ionics, 2000
- Carbon films from polyacrylonitrileJournal of Materials Research, 1989