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

A technology of lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of good cycle performance and stability, large capacitance of composite negative electrode materials, and low charge-discharge specific capacity to achieve cycle performance Good stability, low requirements for reaction conditions, and large capacitance

Active Publication Date: 2018-08-31
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode material prepared by this method solves the problems of low charge-discharge specific capacity and poor cycle performance of existing carbon materials as negative electrode materials for power lithium-ion batteries. The composite negative electrode material has large capacitance, good cycle performance and stability.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A composite negative electrode material for a high-capacity lithium-ion battery, the preparation method of which is as follows:

[0038] (1) Weigh 200g of silicon powder and 800g of natural graphite, mix and stir the silicon and graphite to form a silicon-carbon composite powder. The particle size of the silicon powder is 100nm-1μm, and the particle size of the graphite is between 4μm-26μm. The high-energy ball mill is used for dry mixing, and the mixture is evenly mixed at 150rpm for 30min;

[0039] (2) Mix 1000g of silicon-carbon composite powder obtained in step (1) with 100g of asphalt. The specific method: disperse the silicon-carbon composite powder in tetrahydrofuran / acetone solution dissolved with coal tar pitch, put it into a mixer, and stir at 160rpm for 30min to make it even. In the tetrahydrofuran / acetone solution of coal tar pitch, coal tar pitch 100g, tetrahydrofuran 400g, acetone 500g;

[0040] (3) After drying in a blast oven at 150oC for 2 hours to eva...

Embodiment 2

[0051] A composite negative electrode material for a high-capacity lithium-ion battery, the preparation method of which is as follows:

[0052] (1) Weigh 250g of silicon powder and 750g of natural graphite, mix and stir the silicon and graphite to form a silicon-carbon composite powder. The particle size of the silicon powder is 100nm - 1μm, and the particle size of the graphite is between 4μm - 26μm. The high-energy ball mill is used for dry mixing, and the mixture is uniformly mixed at 150rpm for 30min.

[0053] (2) Mix 1000g of silicon-carbon composite powder obtained in step (1) with 100g of asphalt. The specific method: disperse the silicon-carbon composite powder in tetrahydrofuran / acetone solution dissolved with coal tar pitch, put it into a mixer, and stir at 160rpm for 30min to make it even. In the tetrahydrofuran / acetone solution of coal tar pitch, 100 g of coal tar pitch, 400 g of tetrahydrofuran, and 500 g of acetone.

[0054] (3) After drying in a blast oven at 1...

Embodiment 3

[0064] A composite negative electrode material for a high-capacity lithium-ion battery, the preparation method of which is as follows:

[0065] (1) Weigh 300g of silicon powder and 700g of natural graphite, mix and stir the silicon and graphite to form a silicon-carbon composite powder. The particle size of the silicon powder is 100nm - 1μm, and the particle size of the graphite is between 4μm - 26μm. The high-energy ball mill is used for dry mixing, and the mixture is uniformly mixed at 150rpm for 30min.

[0066] (2) Mix 1000g of silicon-carbon composite powder obtained in step (1) with 100g of asphalt. The specific method: disperse the silicon-carbon composite powder in tetrahydrofuran / acetone solution dissolved with coal tar pitch, put it into a mixer, and stir at 160rpm for 30min to make it even. In the tetrahydrofuran / acetone solution of coal tar pitch, 100 g of coal tar pitch, 400 g of tetrahydrofuran, and 500 g of acetone.

[0067] (3) After drying in a blast oven at 1...

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Abstract

The invention relates to the technical field of a lithium ion battery, in particular to a composite negative electrode material of a high-capacity lithium ion battery and a preparation method of the composite negative electrode material. The constituents of the composite negative electrode material are silicon powder and graphite which are arranged at an inner layer and a dual-layer coating object arranged at an outer layer, a first layer of the dual-layer coating object is a coating carbon layer, the coating object is amorphous carbon, a second layer of the dual-layer coating object is a coating polymer, the coating object is polyaniline, the composite negative electrode material is a powder material, the grain size of the powder material is 0.5 to 40 micrometers, the mass ratio of the silicon powder to the graphite is 1:99 to 1:1, the mass percentage of the coating carbon layer accounts for 3-15%, and the mass percentage of the coating polymer layer accounts for 3-15%. With the composite negative electrode material, the problems of low charging and discharging specific capacity and poor cycle performance of the conventional carbon material serving as the negative electrode material of a power lithium ion battery are solved, and the composite negative electrode material is high in capacitance and has favorable cycle performance and stability performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a composite negative electrode material of a high-capacity lithium-ion battery and a preparation method thereof. Background technique [0002] With the rapid development of pure electric vehicles and hybrid electric vehicles, the demand for high energy density and high safety lithium-ion batteries is very urgent. At present, the negative electrode materials of commercialized power lithium-ion batteries are usually graphite carbon materials, but The charge-discharge specific capacity of carbon materials is low (theoretical capacity is 372mAh / g), and it has been developed close to the theoretical value. A new non-carbon anode material to achieve high safety, large capacity and long cycle life of lithium-ion batteries. Some elements, such as silicon and tin, can alloy with lithium, so they have the function of storing and releasing lithium ions. Moreover, the lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCY02E60/10
Inventor 石先兴严红吕豪杰陈瑶高新宝
Owner WANXIANG 123 CO LTD
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