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Lithium ion battery negative electrode material and preparation method

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of negative electrode material processing performance degradation, etc., to improve discharge capacity and specific capacity , Improve the effect of specific surface area

Active Publication Date: 2015-12-02
RIGHTFUL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simultaneous doping and coating treatment will lead to a decrease in the processing performance of the negative electrode material

Method used

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  • Lithium ion battery negative electrode material and preparation method
  • Lithium ion battery negative electrode material and preparation method
  • Lithium ion battery negative electrode material and preparation method

Examples

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Effect test

Embodiment 1

[0047] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the steps:

[0048] 1) A core matrix material preparation:

[0049] Take 0.24 g of magnesium powder with a particle size of 1.0 μm and 0.72 g of silicon dioxide powder with a particle size of 1.0 μm, and dry-mix them in a ball mill at a speed of 1000 rpm for 18 hours under nitrogen protection, and then dry mix them under nitrogen protection. , the temperature was raised to 600°C at a heating rate of 5°C / min, and the temperature was kept and sintered for 8 hours to obtain a silicon-magnesium composite additive;

[0050] Then add the prepared silicon-magnesium composite additive into 100g of petroleum coke, mix evenly in a jet mill, heat up to a temperature of 700°C at a heating rate of 10°C / min, keep warm for 0.5h, carbonize, pulverize, and spheroidize to obtain ;

[0051] Preparation of B shell material precursor mixture:

[0052] Take 3 g of aniline and ...

Embodiment 2

[0061] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the steps:

[0062] 1) A core matrix material preparation:

[0063] Take 0.14 g of magnesium powder with a particle size of 0.5 μm and 0.36 g of silicon dioxide powder with a particle size of 0.5 μm, and dry-mix them in a ball mill at a speed of 500 rpm for 24 hours under nitrogen protection, and then dry mix them under nitrogen protection. , the temperature was raised to 500°C at a heating rate of 1°C / min, and the temperature was kept and sintered for 12 hours to obtain a silicon-magnesium composite additive;

[0064] Then add the prepared silicon-magnesium composite additive into 100g of petroleum coke, mix evenly in a jet mill, heat up to a temperature of 750°C at a heating rate of 20°C / min, keep warm for 2.0h, carbonize, pulverize, and spheroidize to obtain ;

[0065] Preparation of B shell material precursor mixture:

[0066] Take 3 g of aniline and ...

Embodiment 3

[0075] The preparation method of the lithium ion battery negative electrode material of the present embodiment comprises the steps:

[0076] 1) A core matrix material preparation:

[0077] Take 0.42 g of magnesium powder with a particle size of 2.0 μm and 1.58 g of silicon dioxide powder with a particle size of 2.0 μm, and dry mix them in a ball mill at a speed of 2000 rpm for 12 hours under nitrogen protection, and then dry mix them under nitrogen protection. , the temperature was raised to 800°C at a heating rate of 10°C / min, and the temperature was kept and sintered for 6 hours to obtain a silicon-magnesium composite additive;

[0078] Then add the prepared silicon-magnesium composite additive into 100g of petroleum coke, mix evenly in a jet mill, heat up to a temperature of 900°C at a heating rate of 30°C / min, keep warm for 2.0h, carbonize, pulverize, and spheroidize to obtain ;

[0079] Preparation of B shell material precursor mixture:

[0080] Take 4 g of aniline and...

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Abstract

The present invention relates to a lithium ion battery negative electrode material and a preparation method thereof, particularly to the technical field of lithium ion batteries. The preparation method comprises: preparing a silicon-magnesium composite additive from magnesium powder and silica powder, adding the silicon-magnesium composite additive to petroleum coke, carrying out carbonization to obtain a nuclear matrix material, mixing polyaniline carbon nano-tubes, asphalt and an organic solvent to prepare a shell material precursor, adding the shell material precursor to a tetrahydrofuran mixing solution mixed with a film forming additive, adding the nuclear matrix material to the shell material precursor mixing solution under a vacuum condition, impregnating, evaporating the solvent, sintering, uniformly mixing with active carbon, and sintering so as to obtain the finished product. The prepared lithium ion battery negative electrode material of the present invention has the high comprehensive electrochemical property.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have become the most widely used secondary batteries due to their high voltage, long cycle life, no memory effect, and environmental protection. In recent years, the application fields of lithium-ion batteries have gradually expanded. In addition to the field of consumer electronics, lithium-ion batteries are also widely used in electric vehicles, energy storage and other fields. For different electrical equipment, the performance requirements for lithium-ion batteries are also different, but most application fields have higher and higher requirements for the energy density of batteries. [0003] There are many factors that affect the energy density of lithium-ion batteries, the most important of which is the specific capacity of t...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 程先桃
Owner RIGHTFUL TECH
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