SYNTHESIS OF HIGHLY CRYSTALLINE OLIVINE-TYPELiFePO4NANOPARTICLES BY SOLUTION-BASED REACTIONS

Donghan Kim, Jinsub Lim, Eunseok Choi, Jihyeon Gim, Vinod Mathew, Younkee Paik, Hongryun Jung, Wanjin Lee, Docheon Ahn, Seungmin Paek and Jaekook Kim
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Donghan Kim: Department of Material Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Jinsub Lim: Department of Material Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Eunseok Choi: Department of Material Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Jihyeon Gim: Department of Material Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Vinod Mathew: Department of Material Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Younkee Paik: Daegu Center, Korea Basic Science Institute, Daegu 702-701, Korea
Hongryun Jung: School of Applied Chemical Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Wanjin Lee: School of Applied Chemical Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea
Docheon Ahn: Beamline Research Division, Pohang Accelerator Laboratory, Pohang 790-784, Korea
Seungmin Paek: Beamline Research Division, Pohang Accelerator Laboratory, Pohang 790-784, Korea
Jaekook Kim: Department of Material Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 01, 111-119

Abstract: LiFePO4nanocrystals were synthesized in various polyol media without any further post-heat treatment. TheLiFePO4samples synthesized using three different polyol media namely, diethylene glycol (DEG), triethylene glycol (TEG), and tetraethylene glycol (TTEG), exhibited plate and rod-shaped structures with average sizes of 50–500 nm. The X-ray diffraction (XRD) patterns were indexed on the basis of an olivine structure (space group: Pnma). The samples prepared in DEG, TEG, and TTEG polyol media showed reversible capacities of 123, 155, and 166 mAh/g, respectively, at current density of 0.1 mA/cm2with no capacity fading and exhibited excellent capacity retention up to the 50th cycle. In particular, the samples showed excellent performances at high rates of 30 and 60 C with high capacity retention. It is assumed that the nanometer size materials (~50 nm) possessing a highly crystalline nature may generate improved performance at high rate current densities.

Keywords: Lithium ion battery; LiFePO4; nanocrystal; cathode; polyol (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10014053

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