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A kind of graphene-doped lithium iron phosphate cathode material and preparation method thereof

A positive electrode material, lithium iron phosphate technology, applied in the field of lithium iron phosphate positive electrode material and its preparation, can solve the problems of low specific surface area and difficulty in forming effective channels, and achieve high battery capacity, high tap density and low internal resistance Effect

Active Publication Date: 2016-01-13
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion secondary batteries based on this positive electrode active material have the characteristics of high battery capacity, excellent charge-discharge cycle performance, long life and high cycle stability compared with traditional modified lithium batteries such as carbon coating and conductive polymer doping. , but the specific surface area of ​​this graphene nanosheet is low (less than 1000m 2 / g), and the gaps between the nanosheets are difficult to form effective channels, which limits the free diffusion of lithium ions in the electrolyte

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  • A kind of graphene-doped lithium iron phosphate cathode material and preparation method thereof
  • A kind of graphene-doped lithium iron phosphate cathode material and preparation method thereof
  • A kind of graphene-doped lithium iron phosphate cathode material and preparation method thereof

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Effect test

Embodiment 1

[0037] 1. Preparation of lithium iron phosphate material doped with graphene:

[0038] (1) Add lithium hydroxide, lithium nitrate, ammonium dihydrogen phosphate, ferrous sulfate and ferrous acetate to the aqueous solution according to the atomic ratio Li:Fe:P=3:1:1 to form a mixed solution.

[0039] (2) Weigh 1.0g of graphene three-dimensional derivative material (the surface has a large number of micropores with a pore size ranging from 2nm to 100nm), add it to 50ml of concentrated sulfuric acid, slowly add 3.5g of potassium permanganate under stirring, and stir at room temperature for reaction After 0.5 hours, slowly add 100ml of deionized water, dropwise add hydrogen peroxide until no bubbles are generated, filter and wash with deionized water until neutral, and dry to obtain a three-dimensional graphene oxide derivative material. Dissolving the three-dimensional graphene derivative material obtained by drying in an aqueous solution, and ultrasonically obtaining a dispersed...

Embodiment 2

[0045] 1. Preparation of lithium iron phosphate material doped with graphene:

[0046] (1) Add lithium carbonate, lithium hydroxide and lithium acetate, ammonium ferrous phosphate, ferrous chloride and ferrous nitrate to the aqueous solution according to the atomic ratio Li:Fe:P=3:1:1 to form a mixed solution.

[0047] (2) Weigh 5.0g of graphene three-dimensional derivative material (its conductivity is greater than 100mS / m), add it to 100ml of concentrated sulfuric acid, slowly add 17.5g of potassium permanganate under stirring, stir and react at room temperature for 1.5 hours, then slowly add 300ml deionized water, add hydrogen peroxide dropwise until no bubbles are generated, filter and wash with deionized water until neutral, and dry to obtain a three-dimensional graphene oxide derivative material. Dissolving the three-dimensional graphene derivative material obtained by drying in an aqueous solution, and ultrasonically obtaining a dispersed and stable graphene three-dimen...

Embodiment 3

[0051] 1. Preparation of lithium iron phosphate material doped with graphene:

[0052] (1) Add lithium hydroxide, lithium nitrate, ammonium dihydrogen phosphate, ferrous sulfate and ferrous acetate to the aqueous solution according to the atomic ratio Li:Fe:P=3:1:1 to form a mixed solution.

[0053] (2) Weigh 1.0g of graphene three-dimensional derivative material (its conductivity is greater than 100mS / m), add it to 50ml of concentrated sulfuric acid, slowly add 4g of potassium chromate under stirring, stir and react at room temperature for 5 hours, then slowly add 100ml to remove Ionized water, add hydrogen peroxide dropwise until no bubbles are generated, filter and wash with deionized water until neutral, and dry to obtain a three-dimensional graphene oxide derivative material. Dissolving the three-dimensional graphene derivative material obtained by drying in an aqueous solution, and ultrasonically obtaining a dispersed and stable graphene three-dimensional derivative mate...

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Abstract

The invention relates to a graphene doped lithium iron phosphate positive electrode material and a preparation method thereof. The method comprises the following steps of: (1) mixing a soluble lithium compound, phosphate and a ferrous salt into a dispersing agent to obtain a dispersing solution a; (2) oxidizing a graphene derivative material to obtain an oxidized graphene derivative material, and performing ultrasonic dispersion to obtain a dispersing solution b; and (3) mixing the dispersing solution a and the dispersing solution b, stirring uniformly, spray-drying, and calcining to obtain the graphene doped lithium iron phosphate positive electrode material. A lithium iron secondary battery prepared from the graphene doped lithium iron phosphate positive electrode material has the advantages of high capacity, good circulating performance, large tap density, small internal resistance and long service life.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode preparation, in particular to a graphene-doped lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] Lithium iron phosphate (LiFePO 4 ), also known as LFP, has a stable charging and discharging platform of 3.4V, a theoretical capacity of up to 170mAh / g, and has the advantages of low price, easy preparation, environmental friendliness, safety, good cycle performance and thermal stability. These advantages make lithium iron phosphate considered to be a very potential positive electrode material for power batteries, and has attracted much attention. However, due to the structural factors of lithium iron phosphate itself, its conductivity is low (the electronic conductivity is 10 -10 ~10 -9 S / cm), which greatly limits the electrochemical performance and application of lithium iron phosphate. At present, people have greatly imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCY02E60/10
Inventor 丁兆龙王振中徐怀良瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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