Preparation method of graphene/lithium iron phosphate composite material

A technology of lithium iron phosphate and composite materials, which is applied in the direction of phosphate, phosphorus compounds, phosphorus oxyacids, etc., can solve the problems that affect the conductivity of materials, the lack of uniformity of conductive carbonaceous materials, and the problem of graphene agglomeration is not considered. , to achieve the effect of a good conductive network

Inactive Publication Date: 2016-09-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
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Problems solved by technology

Graphene carbon atoms in Sp 2 hybridized, than disordered Sp 3 Hybrid carbon materials show more excellent conductivity. There have been a lot of research on graphene-coated lithium iron phosphate materials (201210039290.1), but graphene is only mixed with lithium iron phosphate or lithium iron phosphate precursors. The problem of graphene agglomeration during the mixing process is not considered, and the dispersion of the conductive carbonaceous material formed between the particles lacks uniformity, which affects the conductivity of the material

Method used

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  • Preparation method of graphene/lithium iron phosphate composite material
  • Preparation method of graphene/lithium iron phosphate composite material

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Experimental program
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Effect test

Embodiment 1

[0020] 1. Ultrasonically disperse graphite oxide in deionized water to prepare a graphene oxide suspension with a solid content of 5%;

[0021] 2. Add the graphene oxide suspension to the lithium iron phosphate precursor, control the amount of graphene oxide added to 1% of the mass fraction of the solute, add deionized water, adjust the solid content to 70%, and carry out wet ball milling, 40Hz ball milling for 4h , placed at 100°C for 24 hours in vacuum, and ground to obtain a graphene oxide / lithium iron phosphate composite material;

[0022] 3. The graphene oxide / lithium iron phosphate composite material was calcined at 750° C. for 12 hours under a hydrogen atmosphere to obtain a lithium iron phosphate composite material with uniformly dispersed graphene.

Embodiment 2

[0024] 1. Ultrasonically disperse graphite oxide in alcohol to obtain a graphene oxide suspension with a solid content of 5%;

[0025] 2. Add the graphene oxide suspension to the lithium iron phosphate precursor, control the amount of graphene oxide added to 1% of the mass fraction of the solute, add alcohol, adjust the solid content to 70%, and carry out wet ball milling, 40Hz ball milling for 4h, set Vacuum drying at 100°C for 24 hours, grinding to obtain graphene oxide / lithium iron phosphate composite material;

[0026] 3. The graphene oxide / lithium iron phosphate composite material was calcined at 750° C. for 12 hours under a hydrogen atmosphere to obtain a lithium iron phosphate composite material with uniformly dispersed graphene.

Embodiment 3

[0028] 1. Ultrasonically disperse graphite oxide in alcohol to obtain a graphene oxide suspension with a solid content of 10%;

[0029] 2. Add the graphene oxide suspension to the lithium iron phosphate precursor, control the amount of graphene oxide added to 0.5% of the mass fraction of the solute, add alcohol, adjust the solid content to 60%, and carry out wet ball milling, 40Hz ball milling for 4h, set Vacuum drying at 100°C for 24 hours, grinding to obtain graphene oxide / lithium iron phosphate composite material;

[0030] 3. The graphene oxide / lithium iron phosphate composite material was calcined at 750° C. for 12 hours under a hydrogen atmosphere to obtain a lithium iron phosphate composite material with uniformly dispersed graphene.

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Abstract

The invention discloses a preparation method of a graphene/lithium iron phosphate composite material. The method comprises the following steps: adding a graphene oxide suspension liquid to a lithium iron phosphate precursor or a pre-sintered material or a sintered body; adding a little of solvent for wet ball-milling; and carrying out dry grinding treatment after ball-milling, and sintering the product in a reducing atmosphere to prepare the graphene/lithium iron phosphate composite material. The adopted graphite oxide contains a lot of oxygen-containing hydrophilic groups and is easily dispersed into the solvents of water, ethyl alcohol and the like under ultrasonic action, so that the problems of floatation, agglomeration and uneven mixing due to direct addition of graphene in a traditional lithium iron phosphate preparation method are solved; and the graphene prepared by the method is evenly dispersed among lithium iron phosphate particles, is free of accumulation and agglomeration and can form a good conductive network. The method is simple to operate; and large-scale industrial production is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a graphene / lithium iron phosphate composite material. Background technique [0002] With the massive consumption of non-renewable energy, serious pollution of the environment by industrial and automobile exhaust, and wars caused by international energy competition, the development and utilization of renewable and environmentally friendly new energy has become more and more important. Lithium-ion batteries are regarded as one of the most effective electrochemical energy storage systems due to their high specific energy, high specific power, and environmental friendliness. They can store renewable energy such as wind energy, solar energy, and nuclear energy for industrialization. Production, vehicle kinetic energy, domestic electricity, etc., the value of its application has attracted great attention from various countries. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58C01B25/45C01B25/26C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/362H01M4/58H01M4/583H01M4/625Y02E60/10
Inventor 汪伟伟杨茂萍彭家兴戴敏
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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