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Preparation method of carbon-coated lithium iron phosphate material with polystyrene microspheres and polyethylene glycol as carbon sources

A technology of carbon-coated lithium iron phosphate and polystyrene microspheres, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of low electronic conductivity of lithium iron phosphate and slow diffusion of lithium ions, and achieve safety performance and Improved battery performance, low cost, and easy synthesis

Inactive Publication Date: 2013-10-09
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of low electronic conductivity of lithium iron phosphate and slow diffusion of lithium ions, and uses cheap precursors, which reduces production costs and enables large-scale industrial production

Method used

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  • Preparation method of carbon-coated lithium iron phosphate material with polystyrene microspheres and polyethylene glycol as carbon sources
  • Preparation method of carbon-coated lithium iron phosphate material with polystyrene microspheres and polyethylene glycol as carbon sources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix 2% NaOH solution with an equal volume of styrene, separate with a separatory funnel, take the supernatant, and repeat this three times to remove the polymerization inhibitor in the styrene solution to obtain treated styrene monomer;

[0022] (2) Dissolve sodium lauryl sulfate and potassium persulfate in 90ml water mixture according to the mass ratio of 2:1;

[0023] (3) in N 2 Stir for 20 minutes under protection, then heat up to 50°C, heat for 10 minutes, then slowly add the treated styrene monomer dropwise, and react for 24 hours to obtain polystyrene microspheres;

[0024] (4) The obtained polystyrene microspheres and polyethylene glycol are mixed and dissolved in deionized water at a mass ratio of 1:1, and then lithium acetate, iron nitrate and dihydrogen phosphate are added at a mass ratio of 2:3:1 Ammonium, forming a mixed gel;

[0025] (5) Stir the resulting gel at 60 °C for 2 hours,

[0026] (6) Dry in an oven at a constant temperature of 100°C for 1...

Embodiment 2

[0032] (1) Mix 5% NaOH solution with an equal volume of styrene, separate with a separatory funnel, take the supernatant, repeat this three times, remove the polymerization inhibitor in the styrene solution, and obtain treated styrene monomer;

[0033] (2) Dissolve sodium lauryl sulfate and potassium persulfate in 90ml water mixture according to the mass ratio of 3:2;

[0034] (3) in N 2 Stir for 40 minutes under protection, then heat up to 90°C, heat for 10 minutes, then slowly add the treated styrene monomer dropwise, and react for 24 hours to obtain polystyrene microspheres;

[0035] (4) The obtained polystyrene microspheres and polyethylene glycol are mixed and dissolved in deionized water at a mass ratio of 4:1, and then lithium acetate, iron nitrate and dihydrogen phosphate are added at a mass ratio of 1:2:1 Ammonium, forming a mixed gel;

[0036] (5) Stir the resulting gel at 80 °C for 3 hours,

[0037] (6) Dry in an oven at a constant temperature of 150°C for 12 ho...

Embodiment 3

[0043] (1) Mix 10% NaOH solution with equal volume of styrene, separate with a separatory funnel, take the supernatant, repeat this three times, remove the polymerization inhibitor in the styrene solution, and obtain treated styrene monomer;

[0044] (2) Weigh sodium lauryl sulfate and potassium persulfate at a mass ratio of 3:1 and dissolve them in 90ml of water mixture;

[0045] (3) in N 2Stir for 60 minutes under protection, then heat up to 70°C, heat for 10 minutes, then slowly add the treated styrene monomer dropwise, and react for 24 hours to obtain polystyrene microspheres;

[0046] (4) Mix and dissolve the obtained polystyrene microspheres and polyethylene glycol in deionized water at a mass ratio of 2:1, and then add lithium acetate, iron nitrate and dihydrogen phosphate at a mass ratio of 2:4:2 Ammonium, forming a mixed gel;

[0047] (5) Stir the resulting gel at 60-90 °C for 23 hours,

[0048] (6) Dry in an oven at a constant temperature of 120°C for 12 hours; ...

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Abstract

The invention provides a preparation method of a carbon-coated lithium iron phosphate material with polystyrene microspheres and polyethylene glycol as carbon sources. The preparation method comprises the steps of firstly synthesizing the polystyrene microspheres, dissolving the synthesized polystyrene microspheres and polyethylene glycol in deionized water, then mixing lithium acetate, iron nitrate and ammonium dihydrogen phosphate in a certain ratio to form a mixture, stirring the mixture at a certain temperature to obtain a gel, drying the obtained gel in an oven at a constant temperature, grinding the gel and calcining the powder, thus obtaining the carbon-coated lithium iron phosphate powder material. The carbon-coated lithium iron phosphate material prepared by the preparation method has a grain size of 200-400nm, fine and uniform grains and high purity, thus increasing the electron conductivity and the ion diffusion rate. The preparation method is simple and practicable and fast, can be completed in ordinary chemical laboratories, and can be used for large-scale industrial production. The carbon-coated lithium iron phosphate material prepared by the preparation method can serve as an anode material for lithium ion cells.

Description

technical field [0001] The invention relates to a method for preparing carbon-coated lithium iron phosphate capable of industrial production, and belongs to the field of positive electrode materials and electrochemistry of lithium ion batteries. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) safe performance and long cycle life make it a research hotspot in lithium battery cathode materials in recent years. Its main advantages are wide source of materials, low price, non-toxicity, no environmental pollution, high energy density (theoretical specific capacity is 170mAh / g), and good lattice stability. LiFePO in nature 4 The impurity content is high, and it cannot be directly used as the positive electrode material of lithium-ion batteries. [0003] Currently LiFePO 4 There are many synthetic methods, mainly including hydrothermal method, sol-gel method, rheological phase method and so on. LiFePO 4 The sol-gel method is a method in which metal alkoxides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/139H01M4/485
CPCY02E60/10
Inventor 王升富叶建董超熊华玉文为张修华冯传启
Owner HUBEI UNIV
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