| abstract |
Preparation method the present invention relates to carbon coating lithium iron phosphate nano powder and the lithium iron phosphate nano powder according to above method preparation, the preparation method of above-mentioned carbon coating lithium iron phosphate nano powder include：Step (a), is put into lithium precursor, iron precursor and phosphorus precursor to prepare mixed solution in triethanolamine solvent；Step (b), above-mentioned mixed solution is put into reactor and is reacted to prepare amorphous lithium iron phosphate nano seed；And step (c), the lithium iron phosphate nano powder that carbon is coated with come a part of surface for preparing particle or whole surface is heat-treated to prepared above-mentioned lithium iron phosphate nano seed.Pass through the simple procedures of two steps, can prepare in a short time is both controlled particle size and size distribution, the lithium iron phosphate nano powder formed with carbon overlay on particle again, also, the lithium secondary battery comprising prepared above-mentioned carbon coating lithium iron phosphate nano powder as a positive electrode active material is excellent in terms of capacity and stability. |