Graphene-coated lithium iron phosphate positive electrode material and preparation method thereof

A graphene-coated, lithium iron phosphate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor coating uniformity and low electrical performance, and achieve good electrical performance, good rate performance, Simple process effect

Inactive Publication Date: 2016-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the present invention provides a graphene-coated lithium iron phosphate positive electrode material and a preparation method, whi...

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  • Graphene-coated lithium iron phosphate positive electrode material and preparation method thereof
  • Graphene-coated lithium iron phosphate positive electrode material and preparation method thereof
  • Graphene-coated lithium iron phosphate positive electrode material and preparation method thereof

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Embodiment 1

[0037] The preparation method of the nitrogen-doped graphene-coated lithium iron phosphate cathode material in this embodiment comprises the following steps:

[0038] S1. Take 33 mL of 5 mg / mL graphene oxide aqueous solution, dilute with water to 100 mL, ultrasonically disperse for 10 min, then add 15 g of urea and sonicate for 30 min to obtain graphene oxide-urea mixture A;

[0039] S2. Add 0.012 mol of lithium nitrate, 0.024 mol of ammonium dihydrogen phosphate, and 0.024 mol of ferric nitrate into 80 mL, 30 ml, and 60 ml of deionized water, respectively, and mix to obtain lithium nitrate dispersion, ammonium dihydrogen phosphate dispersion, and ferric nitrate dispersion , and then lithium nitrate dispersion, ammonium dihydrogen phosphate dispersion and ferric nitrate dispersion were sequentially and slowly added to mixture A, each addition was stirred at a speed of 50r / min for 0.5h to obtain mixture B;

[0040] S3, drying the mixture B at 80° C. for 24 hours to prepare a ni...

Embodiment 2

[0052] The preparation method of the nitrogen-doped graphene-coated lithium iron phosphate cathode material in this embodiment comprises the following steps:

[0053] S1. Take 50 mL of 3 mg / mL graphene oxide aqueous solution, dilute with water to 100 mL, ultrasonically disperse and disperse for 10 min, then add 15 g of urea and sonicate for 30 min to obtain graphene oxide-urea mixture A;

[0054] S2. Add 0.012 mol of lithium carbonate, 0.024 mol of ammonium dihydrogen phosphate, and 0.024 mol of ferric chloride into 80 mL, 30 ml, and 60 ml of deionized water respectively to prepare lithium carbonate dispersion, ammonium dihydrogen phosphate dispersion, and ferric chloride Dispersion liquid, and then lithium carbonate dispersion liquid, ammonium dihydrogen phosphate dispersion liquid and ferric chloride dispersion liquid were sequentially and slowly added to mixture A, each addition was stirred at a speed of 15r / min for 0.4h to obtain mixture B;

[0055] S3, drying the mixture ...

Embodiment 3

[0058] The preparation method of the nitrogen-doped graphene-coated lithium iron phosphate cathode material in this embodiment comprises the following steps:

[0059] S1. Take 16 mL of 10 mg / mL graphene oxide aqueous solution, dilute with water to 100 mL, ultrasonically disperse and disperse for 10 minutes, then add 15 g of urea and sonicate for 30 minutes to obtain graphene oxide-urea mixture A;

[0060] S2. Add 0.012 mol of lithium sulfate, 0.024 mol of ammonium dihydrogen phosphate, and 0.024 mol of ferric nitrate into 80 mL, 30 ml, and 60 ml of deionized water respectively to prepare lithium sulfate dispersion, ammonium dihydrogen phosphate dispersion and ferric nitrate dispersion , and then lithium sulfate dispersion, ammonium dihydrogen phosphate dispersion and ferric nitrate dispersion were sequentially and slowly added to the mixture A, and each addition was stirred at a speed of 350r / min for 4h to obtain the mixture B;

[0061] S3, drying the mixture B at 90° C. for 2...

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Abstract

The invention provides a graphene-coated lithium iron phosphate positive electrode material and a preparation method thereof, relating to the technical field of batteries. The graphene-coated lithium iron phosphate positive electrode material is a nitrogen-doped graphene-coated lithium iron phosphate positive electrode material. The preparation method comprises the following steps: preparing a mixture A of graphene oxide and nitrogen source dopant; preparing lithium source dispersion liquid, phosphorus source dispersion liquid and iron source dispersion liquid, mixing the lithium source dispersion liquid, the phosphorus source dispersion liquid and the iron source dispersion liquid with the mixture A, and drying to obtain a nitrogen-doped graphene-coated lithium iron phosphate precursor; preheating the precursor, and then sintering in an inert atmosphere to obtain the nitrogen-doped graphene-coated lithium iron phosphate positive electrode material. In a product prepared by the invention, a lithium iron phosphate surface is coated with nitrogen-doped graphene, so that a good electric channel is provided for lithium iron phosphate, so that lithium iron phosphate shows good rate capability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a graphene-coated lithium iron phosphate cathode material and a preparation method. Background technique [0002] With the vigorous development of new energy vehicles, vehicle manufacturers have put forward higher requirements for the performance of lithium-ion batteries of downstream battery companies. Lithium iron phosphate, the current domestic mainstream power lithium-ion battery cathode material, has been widely used in pure electric buses and other fields due to its good safety and high temperature performance. Compared with ternary cathode materials, lithium iron phosphate cathode materials have low energy density, large internal resistance, poor rate performance, and low electronic conductivity. The main methods to improve lithium iron phosphate cathode materials are coating and doping. Carbon coating is a common coating method, and the main carbon sources used incl...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 陈果陈默
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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