Synthesis and characterization of LiFe0.9Mg0.1PO4/nano-carbon webs composite cathode

✍ Scribed by Hui Liu; Jingying Xie

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 761 KB
• Volume: 209
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2008.02.014

✦ Synopsis

LiFe 0.9 Mg 0.1 PO 4 /nano-carbon webs composite cathode material was synthesized from nanocrystalline Fe 3 O 4 through sol-gel process, followed by carbothermal reduction reaction in the presence of LiOH•H 2 O and NH 4 H 2 PO 4 . Sucrose molecule was introduced through liquid phase and used to construct carbon webs structure. FE-SEM and HR-TEM observations show that decomposed carbon can form typical carbon webs structure to connect and wrap LiFe 0.9 Mg 0.1 PO 4 particles. Electrochemical tests indicated that the Mg-doping at 4c site of carbon-coated LiFePO 4 did not affect the olivine structure of the lithium iron phosphate but obviously improve its discharge capacity and rate capability, which would be ascribed to the increased electronic conductivity and/or the mobility of Li + ion induced by the doping method.