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Method for preparing vanadium trioxide coated lithium titanate negative electrode material

A technology of vanadium trioxide coating lithium titanate and negative electrode materials, which can be applied to battery electrodes, electrical components, circuits, etc., can solve problems such as poor electronic conductivity, achieve high rate performance, uniform grain distribution, and good cycle performance Effect

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

[0003] 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 vanadium trioxide-coated lithium titanate negative electrode material to improve its specific capacity under high rate conditions

Method used

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  • Method for preparing vanadium trioxide coated lithium titanate negative electrode material
  • Method for preparing vanadium trioxide coated lithium titanate negative electrode material
  • Method for preparing vanadium trioxide coated lithium titanate negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Li 4 Ti 5 o 12 Preparation of negative electrode materials

[0025] Weigh 0.06mol of lithium acetate and 1.5g of polyvinylpyrrolidone (PVP), dissolve them in 500mL of distilled water; add 0.075mol of 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

[0027] 1% V2O3 coated Li 4 Ti 5 o 12 Preparation of negative electrode materials

[0028] Weigh 0.06mol of lithium acetate and 1.5g of polyvinylpyrrolidone (PVP), dissolve them in 500mL of distilled water; add 0.075mol of 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 0.109g ammonium metavanadate and 0.01mol glycine, dissolved in 500mL distilled water; added pure lithium titanate negative electrode Materials, magnetically stirred for 1h; after evaporating the solvent at 100°C, vacuum drying at 80°C for 1h to obtain the vanadium trioxide-coated lithium titanate precursor; the vanadium trioxide-coated lithium titanate precursor was Calcining at 600° C. for 6 h to obtain a negative electrode material of vanadium trioxide-coat...

Embodiment 3

[0030] 2% V2O3 coated Li 4 Ti 5 o 12 Preparation of negative electrode materials

[0031] Weigh 0.06mol of lithium acetate and 1.5g of polyvinylpyrrolidone (PVP), dissolve them in 500mL of distilled water; add 0.075mol of 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 0.220g ammonium metavanadate and 0.01mol glycine, dissolved in 500mL distilled water; added pure lithium titanate negative electrode Materials, magnetically stirred for 1h; after evaporating the solvent at 100°C, vacuum drying at 80°C for 1h to obtain the vanadium trioxide-coated lithium titanate precursor; the vanadium trioxide-coated lithium titanate precursor was Calcining at 600° C. for 6 h to obtain a negative electrode material of vanadium trioxide-coat...

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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 vanadium trioxide coated lithium titanate negative electrode material. The method comprises the following steps: dissolving lithium acetate and polyvinylpyrrolidone PVP in 500 ml of distilled water, adding nano titanium dioxide, carrying out magnetic stirring for 1 h so as to obtain a slurry, and carrying out spray drying on the slurry so as to obtain a lithium titanate precursor; carrying out heat treatment on the precursor in an air atmosphere until the reaction is completed, so that a pure lithium titanate negative electrode material is obtained; dissolving ammonium metavanadate and glycine in distilled water, adding the pure lithium titanate negative electrode material, carrying out magnetic stirring for 1 h, and after solvents are dried by distillation, carrying out vacuum drying on the obtained object so as to obtain a vanadium trioxide coated lithium titanate precursor; and carrying out heat treatment on the precursor in an argon atmosphere until the reaction is completed, so that a target product vanadium trioxide coated lithium titanate negative electrode material is obtained.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a method for preparing a vanadium trioxide-coated lithium titanate negative electrode material. Background technique [0002] Commercialized lithium-ion battery anode materials mostly use various lithium-intercalated carbon materials. The disadvantages are: react with the electrolyte to form a surface passivation film, resulting in electrolyte consumption and low initial Coulombic efficiency; lithium dendrites are precipitated, making the battery A short circuit can pose a serious safety hazard. Spinel lithium titanate (Li 4 Ti 5 o 12 ) as a new type of lithium-ion battery anode material has obvious advantages: zero strain, excellent cycle performance; high redox potential (1.5VvsLi), does not react with common electrolytes, good safety; environmentally friendly, easy Preparation, low cost, etc. But Li 4 Ti 5 o 12 The low conductivity of the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/62
CPCY02E60/10
Inventor 任玉荣丁建宁曲婕
Owner CHANGZHOU UNIV
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