Multicomponent doping spherical lithium iron phosphate anode material and method of manufacturing the same

Abstract

The invention provides a multi-doping spherical ferric phosphate lithium anode material and manufacture method thereof, the chemical formula of the anode material is Li1.03-xMgx / 2Fe1-yTiy / 2PO4-z / 2Fz / C, wherein 0<x<=0.1; 0<y<=0.1; 0 <z<=0.1. The anode material according to the invention comprises high unit capacity (>160mAh / g) and compaction proportion (1.45 to 1.75g / cm3), which efficiently enhance conduction ability thereof with excellent unit capacity. The raw material of the anode material according to the invention uses villaumite to reduce reaction activation energy, increase liquidoid during reaction process in order to control product particle feature to obtain spherical particle and enhance compaction proportion, being beneficial to improve manufacture process of electrode paste, simplify preparation and coating of battery paste and process the plate electrode; by being doped with magnesium, titanium and fluorine in the material structure to form semiconductors, the conduction ability of the material can be improved. The invention has simply process, low costs, being convenient to realize industrial manufacture.

Description

technical field

[0001] The invention relates to a lithium ion battery cathode material, in particular to a lithium iron phosphate cathode material and a preparation method thereof. Background technique

[0002] In the research field of lithium ion secondary battery cathode materials, lithium iron phosphate LiFePO 4 has received widespread attention. The theoretical capacity of lithium iron phosphate is as high as 170mAh / g, the reversible capacity is high, the structure is stable before and after charging and discharging, and it has a stable voltage platform.

[0003] In the structure of lithium iron phosphate, a FeO 6 Octahedron with two LiO 6 Octahedron and a PO 4 Coedge Tetrahedron, PO 4 tetrahedron with a FeO 6 octahedron and two LiO 6 Octahedral shared edges, this structural feature makes Li + The intercalation and extraction movements of the lithium iron phosphate material are affected, resulting in low conductivity and ion diffusion rate of the lithium iron pho...