A PEG assisted sol-gel synthesis of LiFePO{sub 4} as cathodic material for lithium ion cells
- College of Chemistry, Sichuan University, Chengdu, Sichuan 610064 (China)
- Analytical and Testing Center, Sichuan University, Chengdu, Sichuan 610064 (China)
In order to obtain fine-particle LiFePO{sub 4} with excellent electrochemical performance, LiFePO{sub 4}/C powders were synthesized by a poly(ethylene glycol) (PEG) assisted sol-gel method. All samples were characterized by X-ray powder diffraction and scanning electron microscopy, and their electrochemical properties were investigated by cycle voltammograms and charge-discharge tests. The sample, synthesized with the n {sub PEG}/n {sub LFP} = 1:1 under sintering temperature of 600 deg. C, possesses the global morphology and particle size of about 100 nm. This sample delivers the first discharge capacity of 162 mAh g{sup -1}, i.e. 95.3% of the theoretical capacity, at the 15 mA g{sup -1} discharge current between 2.5 and 4.0 V (versus Li/Li{sup +}). The sample also displays a robust rate capability and stable cycle-life. The improved electrochemical performance originates mainly from the fine particle of nanometric dimension, regular global morphology and uniform dispersing in the product as well as the increased electronic conductivity by carbon coating.
- OSTI ID:
- 21000636
- Journal Information:
- Materials Research Bulletin, Vol. 42, Issue 5; Other Information: DOI: 10.1016/j.materresbull.2006.08.018; PII: S0025-5408(06)00347-3; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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