Abstract
Structural change of Cr-doped LiFePO4/C during cycling is investigated using conventional and synchrotron-based in situ X-ray diffraction techniques. The carbon-coated and Cr-doped LiFePO4 particles are synthesized by a mechanochemical process followed by a one-step heat treatment. The LiFe0.97Cr0.03PO4/C has shown excellent rate performance, delivering the discharge capacity up to 120 mAh/g at 10 C rate. The results suggest that the improvement of the rate performance is attributed to the chromium doping, which facilitates the phase transformation between triphylite and heterosite during cycling, and conductivity improvement by carbon coating. Structural analysis using the synchrotron source also indicates that the doped Cr replaces Fe and/or Li sites in LiFePO4.
Original language | English |
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Pages (from-to) | 7946-7951 |
Number of pages | 6 |
Journal | Electrochimica Acta |
Volume | 53 |
Issue number | 27 |
DOIs | |
Publication status | Published - 2008 Nov 15 |
Bibliographical note
Funding Information:This work was supported by the Growth Engine Technology Development Program Fund of the Ministry of Commerce, Industry and Energy (MOCIE) of Korea.
Keywords
- Carbon coating
- Doping
- In situ X-ray diffraction
- LiFePO
- Lithium batteries
ASJC Scopus subject areas
- General Chemical Engineering
- Electrochemistry