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Preparation method for lithium iron phosphate/graphene composite material with uniformly-dispersed graphene

A lithium iron phosphate and composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of difficult graphene dispersion, large specific surface area, and difficulty in uniform dispersion of dry powder ball milling, and achieve Coulombic efficiency improvement, Simple process and excellent electrochemical performance

Active Publication Date: 2016-01-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dry powder ball milling itself has the characteristics that it is difficult to disperse evenly
Considering that graphene has a large specific surface area and is easy to agglomerate, it is difficult to disperse graphene well by ordinary wet ball milling.

Method used

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  • Preparation method for lithium iron phosphate/graphene composite material with uniformly-dispersed graphene
  • Preparation method for lithium iron phosphate/graphene composite material with uniformly-dispersed graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) according to the PVP mass fraction is 0.5% to take by weighing PVP and be dissolved in deionized water to prepare the PVP solution, then according to the molar ratio Li:Fe=0.98:1 to take by weighing an appropriate amount of ferric phosphate raw material and lithium carbonate to join in the PVP solution, control The solid content of the slurry is 45%, and it is added into a stirring mill for grinding and stirring treatment to obtain a lithium iron phosphate precursor slurry.

[0022] (2) Weigh an appropriate amount of water-soluble chitosan and dissolve it in a PVP solution with a mass fraction of 0.5% to obtain a chitosan and PVP blend solution. Wherein the mass concentration of chitosan is 0.5%, then take appropriate amount of graphene powder and join in above-mentioned chitosan, PVP solution, control the mass concentration of graphene to be 3%, promptly obtain graphene slurry after ultrasonic dispersion .

[0023] (3) Both the lithium iron phosphate precursor slu...

Embodiment 2

[0027] (1) according to PVA mass fraction is 1.5% to take by weighing PVA and be dissolved in deionized water to prepare PVA solution, then according to molar ratio Li:Fe=1.0:1 take by weighing an appropriate amount of iron phosphate raw material and Lithium Hydroxide to join in the PVA solution, Control the solid content of the slurry to 35%, add it into a stirring mill, and perform grinding and stirring treatment to obtain a lithium iron phosphate precursor slurry.

[0028] (2) Weigh an appropriate amount of water-soluble chitosan, dissolve it in a PVA solution with a mass fraction of 1.5%, and obtain a chitosan-PVA blend solution. Wherein the mass concentration of chitosan is 1.0%, then take appropriate amount of graphene powder and join in above-mentioned chitosan, PVA solution, control the mass concentration of graphene to be 3.5%, promptly obtain graphene slurry after ultrasonic dispersion .

[0029] (3) Both the lithium iron phosphate precursor slurry and the graphene ...

Embodiment 3

[0033] (1) according to PVP mass fraction is 2.0% to take by weighing PVP and be dissolved in deionized water and prepare PVP solution, then according to molar ratio Li:Fe=1.01:1 take by weighing an amount of ferric phosphate raw material and lithium carbonate and join in the PVP solution, control The solid content of the slurry is 40%, and it is added into a stirring mill for grinding and stirring treatment to obtain a lithium iron phosphate precursor slurry.

[0034] (2) Weighing an appropriate amount of water-soluble chitosan and dissolving it in a PVP solution with a mass fraction of 2.0% to obtain a chitosan and PVP blend solution. Wherein the mass concentration of chitosan is 1.5%, then take appropriate amount of graphene powder and join in above-mentioned chitosan, PVP solution, control the mass concentration of graphene to be 4.5%, promptly obtain graphene slurry after ultrasonic dispersion .

[0035] (3) Both the lithium iron phosphate precursor slurry and the graphe...

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Abstract

The invention relates to a preparation method for a lithium iron phosphate / graphene composite material with uniformly-dispersed graphene. The method comprises the following steps of: carrying out pre-dispersion on a lithium iron phosphate precursor to obtain a paste; adding a chitosan dispersing agent to the same dispersing agent solution with regard to the graphene; carrying out ultrasonic pre-dispersion to obtain a graphene paste; carrying out superfine grinding and mixing the graphene paste and the lithium iron phosphate precursor paste to achieve mixed dissolving of the graphene paste and the lithium ion phosphate precursor paste; carrying out rapid spray drying and calcination to obtain the lithium iron phosphate / graphene composite material. The method is simple in process, industrial production is easily implemented, the obtained lithium iron phosphate / graphene composite material is excellent in electrochemical performance, particularly, the powder electric resistance of the material is effectively reduced, the polarization is reduced, the initial coulombic efficiency is obviously increased, and the method has wide application prospect in the field of a lithium ion power battery.

Description

technical field [0001] The invention relates to the fields of preparation of electrochemical materials and new energy sources, in particular to a method for preparing a lithium iron phosphate / graphene composite material in which graphene is uniformly dispersed. Background technique [0002] With the increasing energy crisis, the whole world is looking for new renewable resources. Renewable resources such as solar energy, wind energy, tidal energy, geothermal energy, etc. have regional and temporal characteristics. To make full use of these resources, smart grids or large-scale energy storage systems are required. Lithium-ion batteries have promising application prospects as energy storage potentials. On the other hand, the depletion of petrochemical energy forces people to develop hybrid electric or pure electric vehicles, and its core component battery has become a research focus. Compared with other batteries, lithium-ion is favored for its high energy density, good safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M4/36
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 杨茂萍郭钰静
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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