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Preparation method of lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low discharge specific capacity of ferric oxide, achieve cycle stability, increase charge and discharge capacity, and maintain structure The effect of completeness

Inactive Publication Date: 2019-11-29
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ferric oxide and its composites prepared by the two technologies have higher charge and discharge capacities than commercial graphite, they still need to be further improved.
What still needs to be solved is to improve the cycle stability of ferric oxide and the problem of low discharge specific capacity.

Method used

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  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material

Examples

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preparation example Construction

[0027] see Figure 1 to Figure 9 Shown, the preparation method of lithium ion battery negative electrode material of the present invention, at first prepare the ferric oxide (Fe2O3) of pure phase by hydrothermal reaction 2 o 3 ), then successively coat a layer of silicon dioxide and a carbon layer on the outer layer of ferric oxide, and then make the material form a yolk shell structure by etching away the silicon dioxide, and finally coat a layer of trioxide on the outer carbon layer Manganese forms Fe2O3 / C / Mn3MnO nanocomposites with a yolk-shell structure. While the carbon shell facilitates electron transport, the cavity between the carbon shell and the Fe2O3 core provides additional free space for structural strain relief, reducing shell damage caused by large volume changes, thereby maintaining structural integrity. The trimanganese tetraoxide nanomaterial in the carbon layer buffers the stress and strain and enhances the dynamic characteristics of the hybrid material th...

Embodiment 1

[0033] A preparation method for a negative electrode material of a lithium ion battery, comprising the steps of:

[0034] (1) Preparation of pure-phase ferric oxide powder by hydrothermal method: dissolve 6 grams of ferric chloride hexahydrate in 90 ml of water, then respectively 9.9569 grams of sodium acetate trihydrate and 2.9963 grams of hexadecyl trimethyl bromide Ammonium, 21 milliliters of ethylenediamine solution was added to the above solution, stirred for 10 minutes, placed in a reaction kettle, reacted at 200 degrees Celsius for 10 hours, cooled to room temperature, and centrifuged to obtain pure ferric oxide powder.

[0035] (2) Preparation of ferric oxide / silicon dioxide nanocomposite material: Take 0.93184 g of ferric oxide powder prepared in step (1) and dissolve in 560 ml of ethanol, add 2 ml of tetraethoxysilane, stir for 3 After 1 hour, add 10 milliliters of ammonia water and 40 milliliters of deionized water, stir for 4 hours, centrifuge, wash, and dry, then ...

Embodiment 2

[0039] A preparation method for a negative electrode material of a lithium ion battery, comprising the steps of:

[0040] (1) Preparation of pure-phase ferric oxide powder by hydrothermal method: dissolve 2 grams of ferric chloride hexahydrate in 50 ml of water, and then respectively 5 grams of sodium acetate trihydrate and 1 gram of hexadecyltrimethyl bromide Ammonium, 15 ml of ethylenediamine solution was added to the above solution, stirred for 5 minutes, placed in a reaction kettle, reacted at 150 degrees Celsius for 8 hours, cooled to room temperature, and centrifuged to obtain pure ferric oxide powder.

[0041] (2) Preparation of ferric oxide / silicon dioxide nanocomposite material: Take 0.5 g of ferric oxide powder prepared in step (1) and dissolve in 300 ml of ethanol, add 1.5 ml of tetraethoxysilane, stir for 2 After 1 hour, add 5 milliliters of ammonia water and 30 milliliters of deionized water, stir for 3 hours, centrifuge, wash and dry, and then treat in a tube fur...

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Abstract

The invention relates to a preparation method of a lithium ion battery negative electrode material, and belongs to the field of nano composite material preparation. The preparation method comprises the following steps: firstly, pure-phase ferric oxide (Fe2O3) is prepared through a hydrothermal reaction; secondly, the ferric oxide is coated with a silicon dioxide layer and a carbon layer in sequence; thirdly, the silicon dioxide is etched off to form an egg yolk shell structure; and finally, the carbon layer is coated with a layer of manganous-manganic oxide to form a ferric oxide / carbon / manganous-manganic oxide nano composite material with an egg yolk shell structure. While the carbon shell promotes electron transmission, the cavity between the carbon shell and the ferric oxide core provides an additional free space for reducing structural strain. Thus, shell damage caused by large volume change is reduced, and the structural integrity is kept. The manganous-manganic oxide nano material in the carbon layer buffers the stress strain, and the synergistic effect between the manganous-manganic oxide nano material on one hand and the ferric oxide and the carbon layer on the other hand enhances the dynamic characteristics of the hybrid material and enables the material to show excellent performance. When used as a lithium ion battery negative electrode material, the material shows good charge-discharge capacity and cycle stability.

Description

technical field [0001] The invention relates to the field of nanocomposite material preparation, in particular to a method for preparing an egg yolk shell structure composite material, especially a method for preparing a negative electrode material of a lithium ion battery. The charge-discharge capacity and cycle stability of ferric oxide as a lithium battery negative electrode material are improved by successively coating the surface with a carbon layer and trimanganese tetraoxide. Background technique [0002] The growing environmental problems and the desire to find sustainable energy sources have motivated the continuous development of high-performance, clean, and renewable energy storage devices. Rechargeable lithium-ion batteries have been widely used in various portable electronic devices and energy storage devices such as new energy vehicles due to their high energy density, long cycle life, low self-discharge, no memory effect, and environmental friendliness. The c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/583H01M10/0525
CPCH01M4/366H01M4/525H01M4/625H01M4/505H01M4/583H01M10/0525Y02E60/10
Inventor 鞠文涛金波
Owner JILIN UNIV
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