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Negative electrode material and preparation method thereof, negative electrode and battery

A negative electrode material and negative electrode technology, applied in the field of batteries, can solve the problems of hindering the application of silicon-based negative electrode materials, destroying the stability of electrode structure, and the negative electrode material needs to be improved, so as to improve electrochemical performance, facilitate uniform dispersion, and achieve stable structure. Effect

Inactive Publication Date: 2019-05-21
ENN GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the charging and discharging process, silicon and lithium form Li in the fully lithiated state. 4.4 Si alloy has a volume expansion of about 400%. This volume change destroys the stability of the electrode structure and easily causes the electrode structure to collapse, resulting in a rapid decline in battery capacity, which hinders the application of silicon-based negative electrode materials in commercial lithium-ion batteries.
[0003] Therefore, the current negative electrode materials still need to be improved

Method used

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  • Negative electrode material and preparation method thereof, negative electrode and battery
  • Negative electrode material and preparation method thereof, negative electrode and battery
  • Negative electrode material and preparation method thereof, negative electrode and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Preparation of negative electrode material:

[0069] (1) Dissolve 1 g of silicon particles (100 nm) in 10 ml of absolute ethanol, and disperse ultrasonically for 2 hours to form solution A;

[0070] (2) Weigh 0.04g F127, 0.4g CMC, dissolve in 50ml deionized water, and ultrasonically dissolve for 1h to form solution B;

[0071] (3) Take 4g of graphite, slowly add it to solution B under stirring condition and stir for 3h to form solution C;

[0072] (4) Under stirring conditions, solution A was added dropwise to solution C at a rate of 0.01ml / s, and after the addition was completed, stirring was continued for 2 hours to form solution D;

[0073] (5) Put the solution D in a 70°C water bath, stir and evaporate to dryness, and then heat it up to 800°C for 4 hours under a nitrogen atmosphere at a rate of 5°C / min.

[0074] In this embodiment, the scanning electron microscope image of the negative electrode material can refer to image 3 , the first effect of the lithium-ion...

Embodiment 2

[0076] Preparation of negative electrode material:

[0077] (1) Dissolve 0.5g of silicon particles (150nm) in 10ml of absolute ethanol, ultrasonically disperse for 3 hours to form solution A;

[0078] (2) Dissolve 0.09g P123 and 0.9g PAA in 50ml deionized water, and ultrasonically dissolve for 2 hours to form solution B;

[0079] (3) Take 4.5g graphene, slowly add it into solution B under stirring condition and stir for 2h to form solution C;

[0080] (4) Under stirring conditions, solution A was added dropwise to solution C at a rate of 0.01ml / s, and after the addition was completed, stirring was continued for 2 hours to form solution D;

[0081] (5) Put the solution D in a 70°C water bath, stir and evaporate to dryness, and then roast at 2°C / min to 900°C for 2 hours under a nitrogen atmosphere.

[0082] In this embodiment, the scanning electron microscope image of the negative electrode material can refer to Figure 4 , the first effect of the lithium-ion battery is 89%, ...

Embodiment 3

[0084] Preparation of negative electrode material:

[0085] (1) Dissolve 3g of silicon particles (150nm) in 20ml of absolute ethanol, and disperse ultrasonically for 3h to form solution A;

[0086] (2) Dissolve 0.07g F127 and 0.07g CMC in 85ml of deionized water, and ultrasonically dissolve for 2 hours to form solution B;

[0087] (3) Weigh 7g graphene, slowly add it to solution B under stirring condition and stir for 2h to form solution C;

[0088] (4) Under stirring conditions, solution A is added dropwise in solution C, and the dropping speed is 0.005ml / s, after dropping, continue to stir for 2h to form solution D;

[0089] (5) Put the solution D in a 70°C water bath, stir and evaporate to dryness, and then roast at 2°C / min to 900°C for 2 hours under a nitrogen atmosphere.

[0090] In this embodiment, the scanning electron microscope picture of the negative electrode material is shown in Figure 5 and Figure 6 , the first effect of the lithium-ion battery is 90%, the d...

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Abstract

The invention provides a negative electrode material and a preparation method thereof, a negative electrode and a battery, wherein the preparation method of the negative electrode material comprises the following steps: mixing silicon particles with dispersing agent, thereby forming first mixed liquor; mixing surface active agent, first solvent and carbon source together, thereby forming second mixed liquor; mixing the first mixed liquor with the second mixed liquor, further orderly performing drying and roasting for the obtained mixture, thereby obtaining the negative electrode material. Themethod is simple and convenient to operate and easy to realize; and the negative electrode obtained by the method has relatively good first effect, specific capacity and cycle performance.

Description

technical field [0001] The invention relates to the technical field of batteries, and in particular, to a negative electrode material, a preparation method thereof, a negative electrode and a battery. Background technique [0002] At present, silicon is the material with the highest theoretical lithium storage capacity (4200mAh / g), ten times that of the traditional graphite negative electrode (372mAh / g), and far greater than the specific capacity of various nitrides and oxides, plus its abundant resources , No pollution to the environment, it is a research hotspot of lithium-ion battery anode materials. However, during the charging and discharging process, silicon and lithium form Li in the fully lithiated state. 4.4 Si alloys have a volume expansion of about 400%. This volume change destroys the stability of the electrode structure and easily causes the electrode structure to collapse, resulting in a rapid decline in battery capacity, which hinders the application of silic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王俊美白宇鸽郝胐李金来
Owner ENN GRAPHENE TECH CO LTD
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