Open Access Nano Express

Low-temperature synthesis of LiFePO4 nanocrystals by solvothermal route

Jinsub Lim, Sung-Won Kang, Jieh Moon, Sungjin Kim, Hyosun Park, Joseph Paul Baboo and Jaekook Kim*

Author Affiliations

Department of Materials Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, South Korea

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Nanoscale Research Letters 2012, 7:3  doi:10.1186/1556-276X-7-3

Published: 5 January 2012

Abstract

LiFePO4 nanocrystals were synthesized at a very low temperature of 170°C using carbon nanoparticles by a solvothermal process in a polyol medium, namely diethylene glycol without any heat treatment as a post procedure. The powder X-ray diffraction pattern of the LiFePO4 was indexed well to a pure orthorhombic system of olivine structure (space group: Pnma) with no undesirable impurities. The LiFePO4 nanocrystals synthesized at low temperature exhibited mono-dispersed and carbon-mixed plate-type LiFePO4 nanoparticles with average length, width, and thickness of approximately 100 to 300 nm, 100 to 200 nm, and 50 nm, respectively. It also appeared to reveal considerably enhanced electrochemical properties when compared to those of pristine LiFePO4. These observed results clearly indicate the effect of carbon in improving the reactivity and synthesis of LiFePO4 nanoparticles at a significantly lower temperature.

Keywords:
low-temperature synthesis; nanocrystals; LiFePO4; cathode; lithium batteries