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Carbon-coated lithium ferric manganese phosphate positive electrode material and preparation method thereof

A technology of lithium iron manganese phosphate and positive electrode materials, applied in the direction of carbon preparation/purification, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of poor performance of lithium-ion batteries, limited electrochemical performance, and reduced electrical conductivity, etc., to achieve Fast de-intercalation speed, reduced diffusion distance, and improved electrical conductivity

Pending Publication Date: 2022-07-29
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In lithium-ion batteries, the positive electrode material directly leads to the performance of the battery. However, during the movement of lithium ions, the problem of ion channels will lead to a decrease in conductivity, which will lead to the performance of lithium-ion batteries not as good as other batteries. Limitations The performance of the electrochemical performance

Method used

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  • Carbon-coated lithium ferric manganese phosphate positive electrode material and preparation method thereof
  • Carbon-coated lithium ferric manganese phosphate positive electrode material and preparation method thereof
  • Carbon-coated lithium ferric manganese phosphate positive electrode material and preparation method thereof

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preparation example Construction

[0026] The invention provides a preparation method of a carbon-coated lithium iron manganese phosphate cathode material, comprising the following steps:

[0027] (1) mixing lithium source, iron source, manganese source, titanium source, phosphorus source and solvent to obtain mixed system A;

[0028] (2) mixing carbon source and solvent to obtain mixed system B;

[0029] (3) Electrospinning the mixed system A and the mixed system B to obtain a fiber body;

[0030] (4) calcining the fiber body to obtain the carbon-coated lithium iron manganese phosphate cathode material.

[0031] In the present invention, the lithium source in the step (1) is preferably lithium carbonate, lithium acetate or lithium hydroxide; the iron source is preferably ferrous oxalate, ferrous sulfate heptahydrate or ferrous phosphate octahydrate; the The manganese source is preferably manganese acetate, manganese carbonate or manganese dioxide; the titanium source is preferably titanium dioxide or tetrabu...

Embodiment 1

[0045] Take 0.1mol of lithium carbonate, 0.035mol of ferrous oxalate, 0.035mol of manganese acetate, 0.03mol of titanium dioxide, 0.1mol of ammonium dihydrogen phosphate and 0.15L of N,N-dimethylformamide, under the condition of 70KHz The mixed system A was obtained by sonicating for 1.5 h.

[0046] Take 4.5 g of glucose and 20 mL of solvent, the volume ratio of water and N,N-dimethylformamide in the solvent is 1:1, and stir at 150 rpm for 10 min to obtain a mixed system B.

[0047] The hybrid system A and the hybrid system B were electrospinned by cross-pair spinning, the voltage was 45kV, the bolus rate was 1mL / h, the inner diameter of the needle was 0.5mm, the distance between the needle and the receiving drum was 20cm, and the temperature was 35°C to obtain a fibrous body.

[0048] The fibers were calcined at 200 °C for 3 h, then increased to 500 °C at a heating rate of 2 °C / min, calcined at 500 °C for 4 h, then increased to 850 °C at a heating rate of 2 °C / min, and calci...

Embodiment 2

[0054] Take 0.5mol lithium acetate, 0.15mol ferrous sulfate heptahydrate, 0.2mol manganese carbonate, 0.1mol tetrabutyl titanate, 0.6mol diammonium hydrogen phosphate and 0.5L dimethyl sulfoxide, at 80KHz Under the condition of sonication for 1 h, the mixed system A was obtained.

[0055] Take 22.5 g of citric acid and 150 mL of solvent, the volume ratio of water and dimethyl sulfoxide in the solvent is 1:0.5, and stir at 100 rpm for 20 min to obtain a mixed system B.

[0056] The hybrid system A and the hybrid system B were electrospun by means of cross-pair spinning, the voltage was 40kV, the bolus rate was 0.8mL / h, the inner diameter of the needle was 0.6mm, the distance between the needle and the receiving drum was 15cm, and the temperature was 15cm. At 30°C, a fibrous body was obtained.

[0057] The fibers were calcined at 150 °C for 4 h, then raised to 400 °C at a heating rate of 1 °C / min, calcined at 400 °C for 3 h, then raised to 800 °C at a heating rate of 2 °C / min, ...

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Abstract

The invention belongs to the technical field of battery materials. The invention provides a preparation method of a carbon-coated lithium ferric manganese phosphate positive electrode material. The preparation method comprises the following steps: mixing a lithium source, an iron source, a manganese source, a titanium source, a phosphorus source and a solvent under an ultrasonic condition to obtain a mixed system A; according to the invention, various raw materials are uniformly mixed through an ultrasonic method, so that particles in the subsequently obtained material are refined, agglomeration is avoided, and the diffusion distance of lithium ions is reduced. The preparation method comprises the following steps: mixing a carbon source and a solvent to obtain a mixed system B, carrying out electrostatic spinning on the mixed system A and the mixed system B to obtain a fiber body, and carrying out subsequent calcination to obtain the carbon-coated lithium ferric manganese phosphate positive electrode material. And in the later calcining process, a uniform and compact carbon coating layer can be formed, so that the electronic conductivity of the material is improved, and the performance of the positive electrode material is improved. The positive electrode material provided by the invention has the advantages of high lithium ion de-intercalation speed, high diffusion rate and high conductivity, and is a lithium iron manganese phosphate positive electrode material with excellent performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a carbon-coated lithium iron manganese phosphate positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries. Lithium ions move from the negative electrode to the positive electrode during the discharge process and return during the charging process, which has excellent electrochemical performance compared with metal lithium batteries. In lithium-ion batteries, the positive electrode material directly leads to the advantages and disadvantages of the battery performance, but in the process of lithium ion movement, because of the problem of ion channels, the conductivity will be reduced, resulting in the performance of lithium-ion batteries is not as good as other batteries. the development of electrochemical performance. Therefore, how to prepare a cathode material ...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B32/05H01M4/58H01M4/62H01M10/0525
CPCC01B25/45C01B32/05H01M4/5825H01M4/625H01M10/0525C01P2002/72C01P2004/03C01P2006/40H01M2004/021H01M2004/028
Inventor 白哲李军何洁龙吴佳霓张正裕黄新萍
Owner GUANGDONG UNIV OF TECH
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