Preparation of carbon coated LiFePO4 by a combination of spray pyrolysis with planetary ball-milling followed by heat treatment and their electrochemical properties
✍ Scribed by Muxina Konarova; Izumi Taniguchi
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 963 KB
- Volume
- 191
- Category
- Article
- ISSN
- 0032-5910
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✦ Synopsis
Carbon coated LiFePO 4 could be successfully prepared by a combination of spray pyrolysis (SP) with planetary ball-milling (BM) followed by heat treatment at 500 °C. SEM and TEM observations revealed that the carbon coated LiFePO 4 were much smaller in size than the bare LiFePO 4 prepared by the SP followed by heat treatment at 600 °C and the ball-milled bare LiFePO 4 prepared by the combination of SP with BM followed by heat treatment at 500 °C. Furthermore, TEM observations also suggested that conductive carbon could be distributed well on the surface of LiFePO 4 . The electrochemical measurements demonstrated that the carbon coated LiFePO 4 could deliver better battery performance in terms of the discharge capacity, cycling stability and rate capability than the bare LiFePO 4 and the ball-milled bare LiFePO 4 . It exhibited first-discharge capacities of 158 mAh g -1 at 0.1C and 114 mAh g -1 at 5C with excellent cycle performances at 25 °C. The cell tested at 60 °C delivered the theoretical capacity (170 mAh g -1 ) at 0.1C and 78% (133 mAh g -1 ) of theoretical capacity at 5C, respectively.