Magnetic studies of the carbothermal effect on LiFePO4

✍ Scribed by Ait-Salah, A. ;Zaghib, K. ;Mauger, A. ;Gendron, F. ;Julien, C. M.

• Book ID: 105363474
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 182 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521452

✦ Synopsis

Abstract

The effect of carbon coating on the properties of LiFePO~4~ particles is studied from magnetic measurements. Magnetization experiments are an excellent tool to detect very low concentrations of iron‐based impurities (<1 ppm) which are poisoning the phospho‐olivine used as positive electrode material in rechargeable Li‐ion batteries. The results indicate that addition of 5% carbon withdraws traces of the Fe(III) phase such as Fe~2~P and/or Fe~2~O~3~. This carbothermal effect appears to be beneficial for long‐term application of LiFePO~4~ materials in Li‐ion batteries. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)