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Preparation method of lithium iron phosphate/graphene flaky composite material

A technology of lithium iron phosphate and composite materials, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of difficulty in controlling the uniformity of raw materials, safety, and hidden dangers, and achieve enhanced conductivity and low strength , the effect of uniform thickness

Active Publication Date: 2018-01-19
山东丽芳洁环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The solid-phase method is the main method for the synthesis of lithium iron phosphate cathode materials. It is simple to operate and easy to industrialize. However, it is difficult to control the degree of uniformity of raw materials, and the quality of the finished material produced by the solid-phase method has always been lower than that of the liquid-phase method. , while the liquid-phase synthesis process mostly uses reactor-type hydrothermal preparation, using the special properties of supercritical water under high temperature and high pressure conditions to realize the synthesis of materials, but there are safety hazards in the production process
And the current lithium iron phosphate cathode materials are currently limited to lithium iron phosphate with a carbon-coated spherical structure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of lithium iron phosphate / graphene flake composite material, comprising the following steps:

[0028] (1) Add polyvinylpyrrolidone to N,N-dimethylformamide solvent, stir and heat at a constant temperature until dissolved to prepare polyvinylpyrrolidone spinning precursor solution, the mass percentage of the solution is 3%;

[0029] (2) Electrospinning is carried out to the polyvinylpyrrolidone spinning precursor solution that step (1) makes, makes high molecular polymer nanofiber film, and spinning condition is that voltage is 5KV, and the vertical distance of nozzle and receiving plate is 5cm, and the advance speed of the syringe is 20μL / min;

[0030] (3) Take a certain amount of water-soluble chitosan and dissolve it in water to obtain an aqueous solution of chitosan, add lithium carbonate and ferrous phosphate in the aqueous solution of chitosan, stir evenly with ultrasonic waves, and prepare a lithium iron phosphate precursor slurry, The molar ...

Embodiment 2

[0035] A preparation method of lithium iron phosphate / graphene flake composite material, comprising the following steps:

[0036] (1) Add nylon and polyacrylamide to the N,N-dimethylformamide solvent in a mass ratio of 2:1, stir and heat at a constant temperature until dissolved to obtain a spinning precursor solution, the solution has a mass percentage of 15 %;

[0037] (2) Electrospinning is carried out to the spinning precursor solution that step (1) makes, makes macromolecular polymer nanofiber film, and spinning condition is that voltage is 12KV, and the vertical distance of nozzle and receiving plate is 12cm, The syringe advancing speed is 40 μL / min;

[0038] (3) Weigh a certain amount of water-soluble chitosan and dissolve it in water to obtain an aqueous solution of chitosan, add lithium acetate, ferrous oxalate, and diammonium hydrogen phosphate to the aqueous solution of chitosan, stir evenly with ultrasonic waves, and prepare lithium iron phosphate Precursor slurr...

Embodiment 3

[0043]A preparation method of lithium iron phosphate / graphene flake composite material, comprising the following steps:

[0044] (1) Add polyethylene oxide and nylon to the N,N-dimethylformamide solvent in a mass ratio of 1:1, stir and heat at a constant temperature until dissolved to obtain a spinning precursor solution, the solution has a mass percentage of 7 %;

[0045] (2) carry out electrospinning with the spinning precursor solution that step (1) makes, make macromolecular polymer nanofiber film, spinning condition is that voltage is 8KV, and the vertical distance of nozzle and receiving plate is 9cm, The syringe advancing speed is 30 μL / min;

[0046] (3) Take a certain amount of water-soluble chitosan and dissolve it in water to obtain a chitosan aqueous solution, add lithium hydroxide, lithium dihydrogen phosphate, ferrous chloride, and diammonium hydrogen phosphate into the chitosan aqueous solution, and stir ultrasonically Uniform, prepared lithium iron phosphate p...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate / graphene flaky composite material, which comprises the following steps of: preparing high molecule spinning precursor solution; preparing a high-molecular polymer nanofiber membrane; preparing lithium iron phosphate precursor slurry; and preparing a graphene oxide-lithium iron phosphate precursor high-molecular polymer composite thin film, and calcining to obtain the lithium iron phosphate / graphene flaky composite material. The preparation method is simple; the prepared composite material is of a flaky structure and uniform in thickness; a template is easy to remove; and the lithium iron phosphate / graphene flaky composite material has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and relates to a preparation method of lithium iron phosphate / graphene sheet composite material. Background technique [0002] Because of its high specific energy, high specific power and good high temperature performance, lithium-ion batteries are widely used in power supplies for mobile phones, computers, cameras, etc., and have gradually replaced traditional batteries in the fields of aviation, aerospace, satellites and military equipment communications. The high-capacity, high-power power lithium-ion battery will also become an ideal power supply for environmentally friendly electric vehicles. As a new cathode material for lithium-ion secondary batteries, lithium iron phosphate has the advantages of high theoretical specific capacity and moderate voltage platform. [0003] The solid-phase method is the main method for the synthesis of lithium iron phosphate cathode materials. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 袁国防张聪聪王建军刘萌
Owner 山东丽芳洁环保材料有限公司
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