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Preparation method of high-gram-volume and high-first-effect silicon-carbon lithium ion battery anode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., and can solve the problems of difficult electrode processing, capacity loss, and low efficiency.

Inactive Publication Date: 2020-09-15
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-silicon materials are easy to agglomerate during the preparation process, resulting in capacity loss, low efficiency, and difficult electrode processing. How to reduce the agglomeration of nano-silicon particles in silicon-carbon anode materials has become the focus of research in the industry.

Method used

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  • Preparation method of high-gram-volume and high-first-effect silicon-carbon lithium ion battery anode material
  • Preparation method of high-gram-volume and high-first-effect silicon-carbon lithium ion battery anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A preparation method of silicon carbon anode material for lithium ion battery, specifically including the following steps:

[0018] A: Weigh 48kg of deionized water and add cone-shaped stirring to steam dry blender;

[0019] B: Weigh 18g of cetylammonium bromide and add it to the conical stirring evaporator blender at a speed of 200r / min and stirring for 0.5h;

[0020] C: Weigh 12kg of graphite and add it to the conical stirring evaporating dry blender of step B, and stir for 2h;

[0021] D: Add 60kg of nano-silicon solution with a solid content of 10% to the mixture in step C, where the Dv50 of nano-silicon is 60nm, the organic solvent is alcohol, and stir for 3h;

[0022] E: Add 10% solid glucose of silicon and graphite to the mixture of step D, and pass in nitrogen gas, rotate at 200r / min, and stir for 3h;

[0023] F: The mixture of step E is evaporated to dryness by heating, wherein the heating temperature is 240°C, and the stirring speed is 200r / min;

[0024] G: The mixture ob...

Embodiment 2

[0030] A preparation method of silicon carbon anode material for lithium ion battery, specifically including the following steps:

[0031] A: Weigh 18kg of deionized water, add cone-shaped stirring and steam to dry blender;

[0032] B: Weigh 18g of cetylammonium bromide and add it to the conical stirring evaporator blender at a speed of 200r / min and stirring for 0.5h;

[0033] C: Weigh 12kg of graphite and add it to the conical stirring evaporating dry blender of step B, and stir for 2h;

[0034] D: Add 60kg of nano-silicon solution with a solid content of 10% to the mixture in step C, where the Dv50 of nano-silicon is 60nm, the organic solvent is alcohol, and stir for 3h;

[0035] E: Add 10% solid glucose of silicon and graphite to the mixture of step D, and pass in nitrogen gas, rotate at 200r / min, and stir for 3h;

[0036] F: The mixture of step E is evaporated to dryness by heating, wherein the heating temperature is 240°C, and the stirring speed is 200r / min;

[0037] G: The mixture o...

Embodiment 3

[0041] A preparation method of silicon carbon anode material for lithium ion battery, specifically including the following steps:

[0042] A: Weigh 48kg of deionized water and add cone-shaped stirring to steam dry blender;

[0043] B: Weigh 540g of cetyl ammonium bromide and add it to the conical stirring evaporator blender at a speed of 200r / min and stirring for 0.5h;

[0044] C: Weigh 12kg of graphite and add it to the conical stirring evaporating dry blender of step B, and stir for 2h;

[0045] D: Add 60kg of nano-silicon solution with a solid content of 10% to the mixture in step C, where the Dv50 of nano-silicon is 60nm, the organic solvent is alcohol, and stir for 3h;

[0046] E: Add 10% solid glucose of silicon and graphite to the mixture of step D, and pass in nitrogen gas, rotate at 200r / min, and stir for 3h;

[0047] F: The mixture of step E is evaporated to dryness by heating, wherein the heating temperature is 240°C, and the stirring speed is 200r / min;

[0048] G: The mixture ...

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Abstract

The invention provides a preparation method of a high-gram-volume and high-first-effect silicon-carbon lithium ion battery anode material. The preparation method comprises the following steps of: adding graphite into deionized water added with hexadecyl ammonium bromide; uniformly stirring by using a conical stirring evaporation-drying mixer, adding nano silicon slurry with alcohol as a solvent, uniformly stirring again, stirring by using the conical stirring evaporation-drying mixer, evaporating to dryness, roasting by using a box-type carbonization furnace, and screening to obtain the silicon-carbon lithium ion battery anode material. The silicon-carbon anode material prepared by the method has the advantages of high gram volume, high first effect and uniform particle size distribution;and in addition, the preparation method is convenient to operate, simple in process and convenient for commercial popularization.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to the field of preparation of negative electrode materials for silicon carbon lithium ion batteries. Background technique [0002] With the rapid promotion of lithium-ion batteries in various fields of use, the requirements for high energy density and high power density have become increasingly prominent. At present, the negative electrode materials of commercialized lithium-ion batteries are mainly graphite, but the theoretical capacity of graphite materials is too low to be only 372mAh / g, which can no longer meet the needs of lithium-ion battery development. The theoretical capacity of silicon is 4200mAh / g, and it has the advantages of low discharge voltage and good safety. Therefore, the research of silicon carbon anode materials has become a hot spot in the research of battery materials. However, during the preparation process, nano-silicon materials are easy to agglomerate, wh...

Claims

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Application Information

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IPC IPC(8): C01B32/21C01B33/02H01M4/38H01M4/587H01M10/0525
CPCC01B32/21C01B33/02H01M4/386H01M4/587H01M10/0525H01M2004/021H01M2004/027C01P2002/72C01P2006/40Y02E60/10
Inventor 熊永莲邢厚超樊永胜侯光喜严军陈玉炜金丽珠
Owner YANCHENG INST OF TECH