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Lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high content of silicon-carbon nanomaterials, inability to show the capacitance characteristics of silicon materials, and reduce reversible capacitance.

Inactive Publication Date: 2019-05-07
SUPER ENERGY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high content of silicon-carbon nanomaterials reduces the reversible capacitance. If there is a large amount of carbon materials in micron-sized particles, it provides a good cycle life, but it cannot show the high capacitance characteristics of the silicon material itself.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0052] Example 2 is to mix the silicon-carbon composite microspheres 200 and the graphite material 301 in Example 1 as a composite negative electrode material, such as image 3 As shown, the charge and discharge capacity of the negative electrode material of the lithium ion battery can be further improved. The graphite material may be mesocarbon microspheres, natural graphite or artificial graphite.

Embodiment 3

[0053] Example 3 is to mix the silicon-carbon composite microspheres 200 in Example 1 with the ceramic material 401 having a skeleton structure as a composite negative electrode material, the structure of which is as follows: Figure 4 shown. The ceramic material 401 strengthens the mechanical strength of the negative electrode material, and is not easy to cause deformation and crushing of the silicon-carbon composite microsphere during the coating and packaging process. The ceramic material may be silicon oxide, nitride, alumina, silicon carbide, barium carbonate, and the like.

Embodiment 4

[0054] Example 4 is to mix the silicon-carbon composite microspheres in Example 1 with the conductive material 501 to form a composite negative electrode material, the structure of which is as follows: Figure 5 shown. Adding the conductive material 501 can accelerate the surface charge transfer of the negative electrode material after lithium ion intercalation / intercalation, and improve the charge and discharge rate. The conductive material can be activated carbon, carbon felt, alloy, copper mesh, nickel mesh, foamed nickel and the like.

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Abstract

The present invention provides a lithium ion battery negative electrode material including a plurality of secondary particles, the secondary particles being formed by aggregating a plurality of primary particles of a silicon-based material coated with a carbon atom-containing coating film, and the secondary particles being coated with another carbon atom-containing coating film. Therefore, the negative electrode material has the advantages of excellent capacitance, long cycle life and the like. The secondary particles can be further mixed with a graphite material, a conductive material and a ceramic material to form a composite lithium ion battery negative electrode material.

Description

technical field [0001] The invention provides a lithium ion battery negative electrode material, especially a lithium ion battery negative electrode material with a silicon-based material micro-sphere structure. Background technique [0002] Silicon-based materials are used as anode materials for lithium-ion batteries, and their theoretical capacity can reach 4200mAh / g for the first time. However, the study found that the volume of the material changes greatly during the charging and discharging process. N.Dimov et al. (11), the article of p1579 mentioned that the lithium-ion battery anode material using a lithium-ion alloy system such as lithium-silicon will expand to 300% in volume, causing internal cracks in the anode material, resulting in lithium-ion battery cycle life decline. [0003] If the size of silicon-based materials is reduced to the nanometer level, as mentioned in the article published by H.Li et al. in Electrochemical and Solid State Letters, 1999, 2(11), p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 魏汝超
Owner SUPER ENERGY MATERIALS
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