Carbon-coated lithium titanium manganese phosphate composite material and preparation method and application thereof in lithium ion battery

A technology of carbon-coated lithium titanium manganese phosphate and composite materials, which is applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., and can solve problems such as low conductivity and insufficient stability

Inactive Publication Date: 2020-10-23
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of low electronic conductivity and insufficient stability of existing lithium titanium phosphate material...

Method used

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  • Carbon-coated lithium titanium manganese phosphate composite material and preparation method and application thereof in lithium ion battery
  • Carbon-coated lithium titanium manganese phosphate composite material and preparation method and application thereof in lithium ion battery
  • Carbon-coated lithium titanium manganese phosphate composite material and preparation method and application thereof in lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a carbon-coated lithium titanium manganese phosphate composite material, comprising the steps of:

[0030] Weigh 4g of lithium dihydrogen phosphate, 3.14g of manganese acetate and 7.47g of titanium ammonium lactate chelate and dissolve them in 100mL of deionized water, stir magnetically for 2 hours to form a mixed solution, and spray-dry the mixed solution obtained above. The program is set as: export The temperature was 100°C, and the feeding speed was set at 15rpm to obtain the spray-dried precursor powder; after mixing and grinding 0.6g of the precursor and 0.48g of citric acid monohydrate, they were placed in a tube furnace in an argon atmosphere , the temperature was raised to 700°C at a heating rate of 4°C / min, sintered at high temperature for 4 hours, and Li was obtained after cooling 3 MnTi(PO 4 ) 3 / C Composite.

[0031] For the Li of this embodiment 3 MnTi(PO 4 ) 3 The carbon content of the / C composite material was analyzed by a t...

Embodiment 2

[0035] A method for preparing a carbon-coated lithium titanium manganese phosphate composite material, comprising the steps of:

[0036] Weigh 4g of lithium dihydrogen phosphate, 3.14g of manganese acetate, and 7.47g of titanium ammonium lactate chelate and dissolve them in 100mL of deionized water, stir magnetically for 2 hours to form a mixed solution, and spray-dry the mixed solution obtained above. The program is set to: export The temperature was 100°C, and the feeding speed was set to 15r / min to obtain the spray-dried precursor powder; after mixing and grinding 0.6g of the precursor and 0.15g of glucose, they were placed in a tube furnace in an argon atmosphere, Raise the temperature to 850°C at a heating rate of 4°C / min, sinter at high temperature for 4 hours, and obtain Li 3 MnTi(PO 4 ) 3 / C Composite.

Embodiment 3

[0038] A method for preparing a carbon-coated lithium titanium manganese phosphate composite material, comprising the steps of:

[0039] Weigh 4g of lithium dihydrogen phosphate, 3.14g of manganese acetate, and 7.47g of titanium ammonium lactate chelate and dissolve them in 100mL of deionized water, stir magnetically for 2 hours to form a mixed solution, and spray-dry the mixed solution obtained above. The program is set to: export The temperature is 100°C, and the liquid feeding speed is set at 15r / min to obtain the spray-dried precursor powder; after mixing and grinding 0.6g of the precursor and 0.30g of citric acid monohydrate, the tube type is placed in an argon atmosphere In the furnace, the temperature was raised to 600°C at a heating rate of 4°C / min, sintered at high temperature for 12 hours, and Li 3 MnTi(PO 4 ) 3 / C Composite.

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Abstract

The invention relates to a carbon-coated lithium titanium manganese phosphate composite material and a preparation method and application thereof in a lithium ion battery. The preparation method comprises the following steps: dissolving lithium dihydrogen phosphate, a manganese source and a titanium lactate ammonium salt chelate in water to form a mixed solution, and carrying out spray drying on the mixed solution to obtain a precursor; and mixing the precursor with an organic carbon source, calcining, and cooling to obtain the carbon-coated lithium titanium manganese phosphate composite material. The carbon-coated lithium titanium manganese phosphate composite material is applied to the lithium ion battery as an electrode material, and the assembled lithium ion battery has good stabilityand high coulombic efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a carbon-coated titanium-manganese-manganese-lithium phosphate composite material, a preparation method thereof, and an application in lithium-ion batteries. Background technique [0002] Energy and environmental issues are issues that have attracted much attention today. With the advancement of science and technology, the demand for energy continues to increase, and the ensuing environmental pollution is also becoming increasingly severe. The depletion of fossil energy and the dilemma of environmental degradation force people to constantly seek to explore new energy systems. Efficient use of these energy systems requires the support of more emerging technologies. Therefore, the development of efficient and convenient energy storage technology is very important for changing the existing energy structure and developing new energy sources. [0003]...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孙丽侠胡佳艳李晶晶邱滢宋忠诚
Owner JIANGSU UNIV OF TECH
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