Effect of synthesizing method on the properties of LiFePO4/C composite for rechargeable lithium-ion batteries

Improved performance of porous LiFePO4/C as lithium battery cathode processed by high energy milling comparison with conventional ball milling

“…Amorphous FePO 4 $xH 2 O was synthesized by simple precipitation process from aqueous solutions. The process was conducted by the pH control of solution using NH 4 OH at room temperature in order to precipitate FePO 4 identical to that used in our previous study [22]. H 3 PO 4 (Samchun, 85%) solution was gradually added to appropriate molar amount of FeCl 3 solution (POSCO, Pohang) and stirred for 1 h. NH 4 OH was then slowly added to the solution to control the pH value with vigorous stirring at room temperature.…”

“…It was then isolated by filtration, and washed with distilled water and isopropyl alcohol. After washing precipitates (FePO 4 $xH 2 O), a drying process was carried out at 100 C for 6 h. XRD analysis revealed that precipitates were of mostly an amorphous state [22]. LiFePO 4 /C composite were synthesized by a solid-state reaction process using pre-milled Li 2 CO 3 and pre-synthesized amorphous FePO 4 $xH 2 O powders.…”

“…Our ongoing study deals with the optimization of the synthetic condition for LiFePO 4 using this economically favorable FeCl 3 solution as a precursor. Previously, we have reported an appropriate synthesis method for synthesizing amorphous FePO 4 $xH 2 O and subsequent LiFePO 4 /C from this low priced precursor that combines a simple precipitation process and solidstate reaction method followed by conventional ball mill step [22]. The structural and physical properties of the LiFePO 4 /C synthesized in this work are compared to those of a previous work.…”

Synthesis of Carbon-Coated LiFePO4Cathode Material by One-Step Microwave-Assisted Pyrolysis of Ionic Liquid Process

“…The polymeric sources include polypropylene, [9][10][11][12][13] polypyrrole, [14][15][16][17][18] polyvinyl alcohol 19,20 and polythiophene. 21,22 And the glucose, [23][24][25][26] citric acid 27,28 and lauric acid 29,30 are the widely used nonpolymeric sources. The polymeric sources are unstable at high temperature.…”

Effects of High Energy Milling on the Carboncoated Lithium Iron Phosphate Precursor Nature

“…The precursor, produced by mixing lithium source, phosphorus source, iron source and carbon source, was heated in inert atmosphere and finally became carbon-coated LFP cathode material [13] . The performance of the sample will be better with the morphology becoming more uniform and the particle size decreasing [14,15,16] . But so far there has been few researches reported the milling process effect on the precursor.…”