Temperature-driven structural evolution of carbon modified LiFePO 4 in air
Lithium iron phosphate (LiFePO 4 ) is an appealing cathode material for lithium ion batteries. However, the degradation of LiFePO 4 in air presents an unavoidable challenge, due to the vulnerability of divalent Fe against oxygen attack. In this work, we have carried out comprehensive research on the...
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Published in | RSC advances Vol. 5; no. 39; pp. 30537 - 30541 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
2015
|
Online Access | Get full text |
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Summary: | Lithium iron phosphate (LiFePO
4
) is an appealing cathode material for lithium ion batteries. However, the degradation of LiFePO
4
in air presents an unavoidable challenge, due to the vulnerability of divalent Fe against oxygen attack. In this work, we have carried out comprehensive research on the thermal stability and temperature-driven evolution of nanocarbon modified LiFePO
4
in air. The results show that LiFePO
4
retains structural stability up to 250 °C for short periods of exposure to air. At long exposure times, structural evolution occurs at a much lower temperature, 150 °C. The structural evolution proceeds as the temperature increases, and finishes at 400 °C. The final products are monoclinic Li
3
Fe
2
(PO
4
)
3
and α-Fe
2
O
3
. A quantitative evolution map has been developed through electrochemical cyclic voltammetry and galvanostatic tests. The results show that the largest changes take place between 200 and 250 °C. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C5RA04744G |