Approaching Theoretical Capacity of LiFePO[sub 4] at Room Temperature at High Rates
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Abstract
Nanocomposites of and conductive carbon were prepared by two different methods which lead to enhanced electrochemical accessibility of the Fe redox centers in this insulating material. Method A employs a composite of the phosphate with a carbon xerogel formed from a resorcinol-formaldehyde precursor; method B uses surface-oxidized carbon particles to act as a nucleating agent for phosphate growth. Both particle size minimization and intimate carbon contact are necessary to optimize electrochemical performance. Although both methods succeed for the first criteria, the latter is best achieved with method A, affording excellent characteristics in room temperature, liquid electrolyte cells. The resultant composite achieves 90% theoretical capacity at C/2, with very good rate capability and excellent stability. © 2001 The Electrochemical Society. All rights reserved.
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The record
- Venue
- Electrochemical and Solid-State Letters
- Topic
- Advancements in Battery Materials
- Field
- Engineering
- Canadian institutions
- University of Waterloo
- Funders
- University of WaterlooNatural Sciences and Engineering Research Council of CanadaEnergy FoundationLink Foundation
- Keywords
- Materials scienceElectrochemistryComposite numberNanocompositeElectrolyteCarbon fibersChemical engineeringResorcinolRedoxCarbon blackParticle sizeElectrodeNanotechnologyComposite materialOrganic chemistryMetallurgyChemistry
- Has abstract in OpenAlex
- yes