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Lithium iron phosphate/graphene composite material as well as preparation method and application thereof

A technology of lithium iron phosphate and composite materials, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems affecting the application, graphene is difficult to disperse, etc., to improve production efficiency, simple preparation method, liquid absorption strong effect

Active Publication Date: 2017-01-04
ZHEJIANG RICHPOWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty of dispersing in the application of graphene affects its application

Method used

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  • Lithium iron phosphate/graphene composite material as well as preparation method and application thereof
  • Lithium iron phosphate/graphene composite material as well as preparation method and application thereof
  • Lithium iron phosphate/graphene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The invention provides a kind of lithium iron phosphate / graphene composite material, and its preparation method comprises the following steps:

[0050] Step 1: Add 250kg of deionized water into a 500L stirred reactor;

[0051] Step 2: Add 25kg of absolute ethanol to configure the reaction kettle with a concentration of 9.1% ethanol solution;

[0052] Step 3: Weigh raw materials: 71kg of ferric orthophosphate dihydrate, 29kg of battery-grade lithium carbonate, 5kg of polyvinyl alcohol, 2kg of sulfonated graphene with a sheet diameter of 13 μm to 15 μm, and the dispersant type is PVP K30 povidone (PVP) 0.3 kg;

[0053] Step 4: Add the raw materials weighed in step 3 into the reactor, and stir in the reactor to obtain a slurry with a solid content of 28.1%;

[0054] Step 5: Grinding the stirred slurry for 4 hours at a linear speed of 12m / s through a sand mill adding 0.3mm zirconium balls;

[0055] Step 6: Dry the ground slurry by spray drying. The inlet temperature of s...

Embodiment 2

[0058] The invention provides a kind of lithium iron phosphate / graphene composite material, and its preparation method comprises the following steps:

[0059] Step 1: Add 300kg of deionized water into a 500L stirred reactor;

[0060] Step 2: Add 20kg of absolute ethanol to configure the reaction kettle with a concentration of 6.3% ethanol solution;

[0061] Step 3: Weigh raw materials: 100kg of ferric orthophosphate dihydrate, 40kg of industrial grade lithium carbonate, 4kg of polyvinyl alcohol, 2kg of sulfonated graphene with a sheet diameter of 8 μm to 9 μm, and the type of dispersant is PVP K15 povidone (PVP) 0.5 kg;

[0062] Step 4: Add the raw materials weighed in step 3 into the reactor, and stir in the reactor to obtain a slurry with a solid content of 31.4%;

[0063]Step 5: Grinding the stirred slurry for 3 hours at a linear speed of 14m / s through a sand mill adding 0.35mm zirconium balls;

[0064] Step 6: Dry the ground slurry by spray drying. The inlet temperature...

Embodiment 3

[0067] The invention provides a kind of lithium iron phosphate / graphene composite material, and its preparation method comprises the following steps:

[0068] Step 1: Add 380kg of deionized water into a 500L stirred reactor;

[0069] Step 2: Add 30kg of absolute ethanol to configure the reaction kettle with a concentration of 7.3% ethanol solution;

[0070] Step 3: Weigh raw materials: 150kg of ferric orthophosphate dihydrate, 59.8kg of battery-grade lithium carbonate, 9.4kg of polyvinyl alcohol, 5.9kg of sulfonated graphene with a sheet diameter of 25 μm to 28 μm, and the dispersant model is PVP K90 povidone ( PVP) 1kg;

[0071] Step 4: Add the raw materials weighed in step 3 into the reactor, and obtain the slurry by stirring in the reactor;

[0072] Step 5: Grinding the stirred slurry for 2 hours at a linear speed of 14m / s through a sand mill adding 0.4mm zirconium balls;

[0073] Step 6: Dry the ground slurry by spray drying. The inlet temperature of spray drying is 298...

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Abstract

The invention discloses a lithium iron phosphate / graphene composite material as well as a preparation method and application thereof and belongs to the technical field of a positive electrode material of a lithium-ion battery. The preparation method of the lithium iron phosphate / graphene composite material comprises the following steps: (1) taking iron phosphate dihydrate, lithium carbonate, polyvinyl alcohol and graphene sulfonate as raw materials and preparing the raw materials into slurry in a reaction kettle with stirring by adopting an absolute ethyl alcohol water solution with the concentration of 5 percent to 10 percent; adding 0.3 percent to 0.6 percent of polyvinylpyrrolidone (PVP) into the slurry as a dispersant; (2) grinding the slurry added with the dispersant through a sand mill; (3) after grinding, spraying and drying to prepare a lithium iron phosphate / graphene composite material precursor; (4) sintering the precursor in a tubular furnace at 600 DEG C to 700 DEG C for 10 to 20 hours under the protection of mixed gas of nitrogen gas and hydrogen gas; after sintering, cooling a product in the tubular furnace to room temperature to obtain the lithium iron phosphate / graphene composite material.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a lithium iron phosphate / graphene composite material and a preparation method and application thereof. Background technique [0002] Lithium iron phosphate, as a positive electrode active material for lithium-ion batteries, has a large number of applications in the fields of power batteries and energy storage batteries because of its cheap price, environmental friendliness, high safety, and good cycle performance. Lithium iron phosphate is a poor conductor of electrons and the direct application of this material is limited, and its performance is improved by means of coating and doping. The traditional method uses inorganic carbon particles or carbon generated during the pyrolysis of sugars to achieve carbon coating on lithium iron phosphate. For the method of adding inorganic carbon particles, it is difficult to fully cover the su...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/583H01M10/0525C01B25/45
CPCC01B25/45H01M4/362H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 于文志陈家骅许丁丁郑金龙胡大伟
Owner ZHEJIANG RICHPOWER TECH
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