Preparation for high vibration high density lithium iron phosphate

Abstract

A preparation method of lithium iron phosphate with high tap density relates to the technical field of positive electrode active substance preparation of Li-ion battery. The method comprises the following two steps: firstly, synthesizing submicron-scale lithium iron phosphate powder by soft chemical method; and secondly, spraying a polymer solution into the lithium iron phosphate powder while stirring at high speed to granulate, and sintering. The positive electrode active substance lithium iron phosphate of the Li-ion battery prepared by the two-step method has high tap density of 1.5 g / cm, low specific surface area smaller than 10 m / g, and average particle size of 5 to 15 mum. The method has the advantages of simple implementation, low cost and excellent material processability, and suits industrial production.

Description

technical field

[0001] The invention relates to the technical field of preparation of positive electrode active materials for lithium ion batteries. Background technique

[0002] In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of lithium-ion batteries. Currently, the main cathode material is LiCoO 2 , LiNiO 2 , LiMn 2 o 4 . LiCoO 2 It is currently the only positive electrode material that has been industrialized and commercialized on a large scale, and more than 90% of lithium-ion batteries use this material. However, the Co used in this material is expensive, has a low capacity, and is highly toxic, and there are certain safety issues. LiNiO 2 The cost is low, the capacity is high, but the preparation is difficult, the thermal stability is poor, and there is a large potential safety hazard. Spinel LiMn 2 o 4 Low cost, good safety, but low capacity, poor high temperature cycle performance. ...

Images