A novel synthesis of spherical LiFePO4/C composite using Fe1.5P and mixed lithium salts via oxygen permeation

作者：Wang Guixin; Liu Rui; Chen Miao; Kang Hanchang; Li Xiuli; Yan Kangping^*

来源：Korean Journal of Chemical Engineering, 2012, 29(8): 1094-1101.

DOI：10.1007/s11814-011-0284-1

• LiFePO4/C Composite
• Fe1.5P Byproduct
• Rheological Phase Method
• Thermal Analysis
• Electrochemical Performance

A novel route was designed to synthesize LiFePO4/C composites by using the Fe1.5P byproduct, mixed lithium salts, and permeated oxygen from air via a rheological phase method. The reaction process was investigated with various techniques. When the calcining time was increased from 10 to 30 h, the gradual formation of olivine structure was observed. The growth kinetics of the crystals was analyzed. SEM and TEM results indicated the as-synthesized LiFePO4 was constituted of small spheres covered with carbon particles. The discharge capacity of the LiFePO4/C composite prepared at similar to 700 degrees C for similar to 25 h could reach 139.7 rnAh g(-1) and still remained 130.2 mAh g(-1) after 15 cycles at 0.2 C rate, comparable to that of the reported LiFePO4/C composite using conventional methods. Cyclic voltammogram confirmed the LiFePO4/C composite had a high purity and good lithium ion insertion/desertion redox behavior.

• 出版日期2012-8
• 单位四川大学