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A kind of preparation method of high-capacity lithium-ion battery composite negative electrode material

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as not preventing scientists from researching, reducing Coulombic efficiency, and limiting the development of lithium-ion batteries , achieving high reversible capacity and cycle stability, shortening the diffusion path, and good application prospects

Active Publication Date: 2020-08-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mainstream lithium battery anode material on the market is still graphite. Although it has excellent voltage characteristics, its capacity is too low. battery development
Due to the abundant reserves, low lithium insertion potential and high theoretical capacity of silicon materials, although limited by poor cycle stability, scientists have not stopped their research on it.

Method used

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  • A kind of preparation method of high-capacity lithium-ion battery composite negative electrode material
  • A kind of preparation method of high-capacity lithium-ion battery composite negative electrode material
  • A kind of preparation method of high-capacity lithium-ion battery composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Configure mixed dispersion

[0030] Add graphite oxide powder into deionized water and ultrasonically disperse to form a 1 mg / ml GO water dispersion.

[0031] Add 0.17g of surfactant cetyltrimethylammonium bromide to 30ml of ethanol, ultrasonically dissolve the surfactant completely, then add it into the GO water dispersion prepared above at a volume ratio of 1:1, and stir evenly with magnetic force , to obtain a mixed dispersion;

[0032] (2) Preparation of SiO 2 / GO nanocomposite

[0033] Add ethyl orthosilicate to the mixed dispersion in step (1) (according to the mass ratio of graphite oxide and ethyl orthosilicate in the mixed dispersion is 1:10), stir evenly with magnetic force and slowly drop ammonia water to adjust the dispersion The pH value of SiO is 10, and after stirring evenly, it is hydrothermally reacted at 180°C for 10h, filtered with suction, and dried the filter cake to obtain SiO 2 / GO nanocomposite powder;

[0034] (3) Magnesium thermal redu...

Embodiment 2

[0040] In step (2), according to the mass ratio of graphite oxide and ethyl orthosilicate in the mixed dispersion liquid is 1:5, ethyl orthosilicate is added in the mixed dispersion liquid, and the remaining conditions and steps are the same as in Example 1, namely Obtained MR-Si / G-5 nanocomposite material, its cycle graph and AC impedance graph are as attached Figure 4 with 5 shown.

[0041] Among them, the reversible capacity is 550mAh / g, and after 60 cycles, the capacity retention rate is 95.5%.

Embodiment 3

[0043] In step (2), according to the mass ratio of graphite oxide and ethyl orthosilicate in the mixed dispersion liquid is 1:20, ethyl orthosilicate is added in the mixed dispersion liquid, and the remaining conditions and steps are the same as in Example 1, namely Obtained MR-Si / G-20 nanocomposite material, its cycle graph and AC impedance graph are as attached Figure 4 with 5 shown.

[0044] Among them, the reversible capacity is 670mAh / g, and after 60 cycles, the capacity retention rate is 89.3%.

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Abstract

The invention belongs to the field of preparation of electrode materials and particularly relates to a preparation method of a high-capacity lithium-ion battery composite anode material; the preparation method comprises the steps of adding graphene oxide solution into ethanol in which a surfactant is dissolved to obtain mixed solution; hydrolyzing organic silicon in the mixed solution, and hydrothermally reacting to obtain SiO2 / GO nano composite; roasting the nano composite, and subjecting the nano composite and magnesium powder to magnesiothermic reduction evenly in an inert atmosphere; acid-pickling the reduced powder, and washing and drying to obtain the MR-Si / G nano composite. The preparation method has the advantages that the raw materials are widely resourceful, the method is low in cost and environmentally friendly, and reduction of silicon dioxide can be finished at low temperature.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to a preparation method of a high-capacity lithium-ion battery composite negative electrode material. Background technique [0002] With the massive development and utilization of fossil fuels, not only the resources are depleted, but also serious environmental pollution. In such an era background, wind energy, water energy, hydrogen energy, nuclear energy, solar energy and other new energy sources are constantly being developed and utilized. As an important aspect of the utilization of new renewable energy, the quality of energy storage devices is an important indicator to determine whether they can be marketed. At present, the mainstream lithium battery anode material on the market is still graphite. Although it has excellent voltage characteristics, its capacity is too low. battery development. Due to the abundant reserves, low lithium insertion potent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/386H01M4/628H01M10/0525Y02E60/10
Inventor 任玉荣朱江流杨波丁建宁
Owner CHANGZHOU UNIV