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Method for preparing molybdenum dioxide coated lithium titanate negative electrode material

A technology of coating lithium titanate and molybdenum dioxide, which is applied to battery electrodes, electrical components, circuits, etc., can solve problems such as poor electronic conductivity, and achieve high rate performance, good cycle performance, and uniform grain distribution.

Active Publication Date: 2015-06-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve Li 4 Ti 5 o 12 To solve the problem of poor electronic conductivity, the present invention proposes a method for preparing molybdenum dioxide-coated lithium titanate negative electrode material to improve its specific capacity under high rate conditions

Method used

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  • Method for preparing molybdenum dioxide coated lithium titanate negative electrode material
  • Method for preparing molybdenum dioxide coated lithium titanate negative electrode material
  • Method for preparing molybdenum dioxide coated lithium titanate negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Li 4 Ti 5 o 12 Preparation of negative electrode materials

[0026] Weigh 0.06mol lithium acetate and 1.5g polyvinylpyrrolidone (PVP), dissolve them in 500mL distilled water; add 0.075mol nano-titanium dioxide, and stir magnetically for 1 hour to obtain a slurry; spray dry the slurry at 110°C to obtain a lithium titanate precursor ; The lithium titanate precursor was calcined at 750° C. for 8 hours in an air atmosphere to obtain a pure lithium titanate negative electrode material. X-ray diffraction pattern see figure 1 .

Embodiment 2

[0028] 2% molybdenum dioxide coated Li 4 Ti 5 o 12 Preparation of negative electrode materials

[0029] Weigh 0.06mol lithium acetate and 1.5g polyvinylpyrrolidone (PVP), dissolve them in 500mL distilled water; add 0.075mol nano-titanium dioxide, and stir magnetically for 1 hour to obtain a slurry; spray dry the slurry at 110°C to obtain a lithium titanate precursor ; The lithium titanate precursor was roasted at 750°C for 8 hours in an air atmosphere to obtain a pure lithium titanate negative electrode material; weigh 0.216g ammonium molybdate and 0.005mol tartaric acid, dissolve them in 500mL distilled water; add pure lithium titanate negative electrode material , magnetic stirring for 1 h; after evaporating the solvent at 100°C, vacuum drying at 80°C for 1 h to obtain the molybdenum dioxide-coated lithium titanate precursor; Calcined for 6 hours at the bottom to obtain molybdenum dioxide-coated lithium titanate negative electrode material. X-ray diffraction pattern see ...

Embodiment 3

[0031] 4% molybdenum dioxide coated Li 4 Ti 5 o 12 Preparation of negative electrode materials

[0032] Weigh 0.06mol lithium acetate and 1.5g polyvinylpyrrolidone (PVP), dissolve them in 500mL distilled water; add 0.075mol nano-titanium dioxide, and stir magnetically for 1 hour to obtain a slurry; spray dry the slurry at 110°C to obtain a lithium titanate precursor ;The lithium titanate precursor was roasted at 750°C for 8 hours in an air atmosphere to obtain a pure lithium titanate negative electrode material; weighed 0.443g ammonium molybdate and 0.005mol tartaric acid, dissolved in 500mL distilled water; added pure lithium titanate negative electrode material , magnetic stirring for 1 h; after evaporating the solvent at 100°C, vacuum drying at 80°C for 1 h to obtain the molybdenum dioxide-coated lithium titanate precursor; Calcined for 6 hours at the bottom to obtain molybdenum dioxide-coated lithium titanate negative electrode material. X-ray diffraction pattern see ...

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Abstract

The invention relates to the technical field of lithium ion battery manufacturing, and particularly relates to a method for preparing a molybdenum dioxide coated lithium titanate negative electrode material. The method comprises the following steps: dissolving lithium acetate and polyvinylpyrrolidone in distilled water, adding nano titanium dioxide, and carrying out magnetic stirring for 1 h so as to obtain a slurry; carrying out spray drying on the slurry so as to obtain a lithium titanate precursor; roasting the precursor for 8 h at a temperature of 750 DEG C in an air atmosphere so as to obtain a pure lithium titanate negative electrode material; dissolving ammonium molybdate and a tartaric acid in distilled water, adding the pure lithium titanate negative electrode material, and carrying out magnetic stirring for 1 h; after solvents are dried by distillation at a temperature of 100 DEG C, carrying out vacuum drying on the obtained object for 1 h at a temperature of 80 DEG C, so that a molybdenum dioxide coated lithium titanate precursor is obtained; and roasting the molybdenum dioxide coated lithium titanate precursor for 6 h at a temperature of 600 DEG C in an argon atmosphere, so that a molybdenum dioxide coated lithium titanate negative electrode material is obtained. The method disclosed by the invention is simple and safe in process, and low in cost, and the obtained molybdenum dioxide coated lithium titanate negative electrode material has good electrochemical properties.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacture, in particular to a method for preparing a molybdenum dioxide-coated lithium titanate negative electrode material. Background technique [0002] With the increasing shortage of non-renewable fossil fuels such as oil and natural gas, countries all over the world are researching and developing electric vehicles without fuel. As the core component of electric vehicles, power batteries have also ushered in great opportunities for development. At present, power batteries mainly include lithium-ion batteries, lead-acid batteries, fuel cells, etc. Among them, lithium-ion batteries have attracted much attention because of their high capacity, high power, long life and environmental friendliness. For lithium-ion batteries, the main components include electrolyte, separator, positive and negative electrode materials, etc. At present, most of the commercial lithium-ion battery anode ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/62
CPCY02E60/10
Inventor 任玉荣丁建宁曲婕
Owner CHANGZHOU UNIV
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