Lithium ion battery anode material manganese lithium iron phosphate and preparation method thereof

Abstract

The invention relates to lithium ion battery anode material manganese lithium iron phosphate and a preparation method thereof. The preparation method comprises the following steps of firstly weighing a certain amount of lithium source, iron source and phosphorus source according to the molar ratio of (1.0-1.2) to 1 to 1, adding a carbon source the mass fraction of which is 5%-13%, uniformly mixing, placing a mixture in an inert gas atmosphere at 250-400DEG C, and carrying out heat treatment for 2-5 hours and furnace cooling treatment on the mixture; taking a half of the prepared mixture to add in a manganese source according to the iron/manganese molar ratio at 1 to 1, meanwhile, weighing the lithium source, and the phosphorus source according to the manganese source/ lithium source/ phosphorus source molar ratio of 1 to (1.0-1.2) to 1, adding 3% of the carbon source, and uniformly mixing; placing a manganese lithium iron phosphate precursor after uniformly mixing in a chemical combination furnace, carrying out chemical combination treatment on the manganese lithium iron phosphate precursor for 2-20 minutes, and calcining the manganese lithium iron phosphate precursor; and finally, controlling the heating rate at 5-12DEG C/min, carrying out calcination treatment on a precursor powder material for 3-12 h after chemical combination treatment under inert gas atmosphere protection at 550-750DEG C, and carrying out furnace cooling on the precursor powder material to indoor temperature so as to obtain a carbon-coated manganese lithium iron phosphate anode material. The lithium ion battery anode material manganese lithium iron phosphate and the preparation method provided by the invention have the advantages that a lithium manganese phosphate structure is stable, the electronic conductivity of the lithium manganese phosphate is improved, and the manganese lithium iron phosphate anode material has the good electrochemical property.

Description

technical field [0001] The invention belongs to the preparation method of battery anode materials in the field of materials, and in particular relates to a lithium iron manganese phosphate lithium ion battery anode material and a preparation method thereof. Background technique [0002] With the development of social economy and the improvement of human living standards, the demand for energy in various countries is increasing day by day, while the reduction of traditional fossil energy (coal, oil, natural gas) and the deterioration of the earth's environment have become two major obstacles for human survival and development. Obstacles, searching for new energy sources, and developing energy-saving and environment-friendly energy storage and conversion devices have become one of the hot topics of research in various countries. As a device for mutual conversion of chemical energy and electrical energy, battery is an important medium for rational utilization of energy. The pro...

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Problems solved by technology

[0006] The purpose of the present invention is to use lithium iron manganese phosphate as the positive electrode material of lithium ion battery, improve the problem of poor electronic conductivity of lithium manganese phosphate positive electrode material, and solve the structural instability problem caused by manganese element ginger-Taylor effect in lithium manganese phosphate simultaneously, improve Discharge specific capacity and rate performance

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