Method for preparing lithium iron phosphate positive electrode material using polycyclic aromatic hydrocarbon resin as carbon source

Abstract

The invention discloses a method for preparing a lithium iron phosphate positive electrode material by taking polycyclic aromatic hydrocarbon rein as a carbon source. The method comprises the steps of weighing iron phosphate and lithium hydroxide at the weight ratio of 1:3-5 firstly; uniformly mixing iron phosphate, lithium hydroxide and polycyclic aromatic hydrocarbon rein to obtain a mixture; adding the mixture into an ethanol solution and palletizing by adopting a wet process to obtain slurry containing ball-milled precursor; drying the slurry containing the ball-milled precursor in a drying oven, and pulverizing and screening the slurry to obtain a precursor; and finally putting the precursor into a high temperature furnace and performing thermal insulation to obtain the lithium iron phosphate positive electrode material. The carbon source adopted by the method is the polycyclic aromatic hydrocarbon rein, so that low temperature volatile component residue barely exists; the carbon content is more than 90wt%; the baking technological conditions have relatively less influences on a pyrolysis process, carbon residue rate and the like; and the obtained material is high in electrical property consistency.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and specifically refers to a method for preparing a lithium iron phosphate cathode material by using a polycyclic aromatic hydrocarbon resin as a carbon source. Background technique [0002] In recent years, with the increasingly serious problems of energy shortage and environmental pollution, the country vigorously advocates energy conservation, emission reduction and green environmental protection, and the research and development of electric vehicles (EV) and hybrid vehicles (HEV) is imperative. At present, the bottleneck restricting the development of electric vehicles is whether to develop cheap, safe and environment-friendly secondary batteries. Lithium-ion batteries are recognized as the most promising electric vehicle power batteries due to their high specific energy and high specific power. The safety of lithium-ion batteries largely depends on the cathode material. Among various l...

AI Technical Summary

Problems solved by technology

[0007] 1) The composition of asphalt is very complex, it is a very complex mixture, the structure of asphalt is unstable, it is easy to be oxidized, its composition will change when it encounters high temperature, and the stability of the product is also very poor;

[0008] 2) Asphalt has a certain degree of adhesion, and it will stick to the equipment during the mixing process, which is not easy to clean up;

[0009] 3) Asphalt also contains N, O, S and other elements, high temperature will produce SO 2 (sulfur dioxide) and other gases pollute the environment and are also harmful to the human body

Images