Preparation method of tungsten oxide/carbon flower-ball-shaped lithium battery composite negative electrode material

A negative electrode material, lithium battery technology, applied in battery electrodes, lithium storage batteries, negative electrodes, etc., can solve the problems of increasing production energy consumption and investment, unfavorable industrialization development, etc., saving energy consumption and equipment investment, and mild preparation conditions Effect

Active Publication Date: 2021-02-26
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precipitation of tungsten oxide, the adjustment of microscopic morphology and the coating of dopamine often require multi-step reactions, which increases the energy consumption and investment of production, which is not conducive to the development of industrialization

Method used

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  • Preparation method of tungsten oxide/carbon flower-ball-shaped lithium battery composite negative electrode material
  • Preparation method of tungsten oxide/carbon flower-ball-shaped lithium battery composite negative electrode material
  • Preparation method of tungsten oxide/carbon flower-ball-shaped lithium battery composite negative electrode material

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Effect test

Embodiment 1

[0031] A method for preparing a tungsten oxide / carbon flower-shaped lithium battery composite negative electrode material, comprising the steps of:

[0032] (1) Material preparation: Take polyether F127 with an average molecular weight of 2800 and dissolve it in 29mL of water to make polyether F127 aqueous solution, then dissolve soluble tungstate in polyether F127 aqueous solution to prepare tungstate and polyether Dispersion of F127; dissolving dopamine in deionized water to form a dopamine solution;

[0033] (2) Preparation of lithium battery anode material co-precipitated with tungsten and carbon precursors: Take dopamine solution and add it to the dispersion containing tungstate and polyether F127. At this time, the concentration of polyether F127 in the solution is 17g / L. The concentration of sodium tungstate was 1.2mmol / L, and the concentration of dopamine was 63mmol / L. The mixed reaction solution was prepared and stirred at 25°C for 24 hours. After the stirring was com...

Embodiment 2

[0043] A method for preparing a tungsten oxide / carbon flower-shaped lithium battery composite negative electrode material, comprising the steps of:

[0044] (1) Material preparation: Take polyether F127 with an average molecular weight of 1000 and dissolve it in 29mL of water to make polyether F127 aqueous solution, then dissolve soluble tungstate in polyether F127 aqueous solution to prepare tungstate and polyether Dispersion of F127; dissolving dopamine in deionized water to form a dopamine solution;

[0045] (2) Preparation of lithium battery negative electrode material co-precipitated with tungsten and carbon precursors: take dopamine solution and add it to the dispersion containing tungstate and polyether F127. At this time, the concentration of polyether F127 in the solution is 5g / L. The concentration of sodium tungstate was 0.5mmol / L, and the concentration of dopamine was 20mmol / L. The mixed reaction solution was prepared and stirred at 20°C for 20h. After stirring, it ...

Embodiment 3

[0049] A method for preparing a tungsten oxide / carbon flower-shaped lithium battery composite negative electrode material, comprising the steps of:

[0050] (1) Material preparation: Dissolve polyether F127 with an average molecular weight of 15,000 in 29mL of water to make a polyether F127 aqueous solution, and then dissolve soluble tungstate in the polyether F127 aqueous solution to prepare tungstate and polyether Dispersion of F127; dissolving dopamine in deionized water to form a dopamine solution;

[0051] (2) Preparation of lithium battery negative electrode material co-precipitated with tungsten and carbon precursors: take dopamine solution and add it to the dispersion containing tungstate and polyether F127. At this time, the concentration of polyether F127 in the solution is 50g / L. The concentration of sodium tungstate was 5mmol / L, and the concentration of dopamine was 100mmol / L. The mixed reaction solution was prepared and stirred at 35°C for 5h. After the stirring w...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a preparation method of a tungsten oxide / carbon flower-ball-shaped lithium battery composite negative electrode material, which comprises the following steps: dissolving a soluble tungstate in a polyether F127 water solution with the concentration of 5-50g / L, adding a dopamine solution, and conducting mixing, centrifuging, drying and calcining to obtain the tungsten oxide / carbon flower-ball-shaped lithium battery composite negative electrode material. According to the preparation method, a method of mutual promotion of tungstate precipitation and dopamine polymerization is adopted, in the presence of polyether F127, precipitation of tungsten oxide, adjustment of microstructure and coating of dopamine are realized at the same time through one-step reaction, and the lithium battery negative electrode material with a flower-ball-shaped micron-sized tungsten oxide / carbon structure is prepared.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a tungsten oxide / carbon flower spherical lithium battery composite negative electrode material. Background technique [0002] Although graphite anode materials for lithium batteries have already been commercially applied, the limitations of graphite-based anode materials in terms of mass specific capacity and large rate discharge are still important issues that limit the development of lithium batteries. In recent years, tungsten-based lithium battery anode materials are attracting more and more attention, mainly because tungsten-based anode materials have significant advantages in terms of theoretical capacity, high-rate discharge, and charge-discharge volume change, among which three Tungsten oxide is considered to be a more promising transition metal oxide. However, during the process of lithium insertion and delithiation, the volume change of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/02H01M10/052
CPCH01M4/362H01M4/483H01M4/62H01M4/02H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 史家远刘江涛王庆杰刘富亮陈晓涛石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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