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Preparation method for carbon-coated silicon negative electrode material for lithium ion battery

A technology of lithium-ion batteries and carbon-coated materials, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as hindering the development of new energy vehicles, unsafe costs, and short driving mileage, and achieves easy process realization, The effect of low cost and high conductivity

Inactive Publication Date: 2016-09-21
天津普兰能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Environmental problems and energy crisis have prompted countries to vigorously develop new energy vehicles, but short driving range, insufficient power, unsafety and high cost have always hindered the development of new energy vehicles

Method used

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  • Preparation method for carbon-coated silicon negative electrode material for lithium ion battery
  • Preparation method for carbon-coated silicon negative electrode material for lithium ion battery
  • Preparation method for carbon-coated silicon negative electrode material for lithium ion battery

Examples

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Embodiment 1

[0036] Embodiment 1 A kind of with sucrose as the first carbon coating, graphene is the preparation method of the silicon negative electrode material of the lithium ion battery of the second carbon coating, and its steps comprise:

[0037] 1) Put 80 grams of silicon powder with a particle size of 8 μm into the ball mill, add 160 ml of water, and ball mill for 6 hours;

[0038] 2) 20g of sucrose and 5g of polyvinyl alcohol were dissolved in 40ml of water to obtain the first carbon coating solution;

[0039] 3) adding the first carbon coating layer solution in step 2) to step 1), and continuing ball milling for 2 hours to obtain a dispersion of nano-sized silicon particles and the first carbon coating material;

[0040] 4) spray drying to remove the moisture of the dispersion liquid of the nano-silicon obtained in step 3) and the first carbon-coated material to obtain a solid;

[0041] 5) Carrying out high-temperature carbonization treatment of the solid in step 4) under a nitr...

Embodiment 2

[0048] A method for preparing a lithium-ion battery silicon negative electrode material with graphite as the first carbon coating and graphene oxide as the second coating, the steps comprising:

[0049] 1) Add 100 grams of silicon powder with a D50 of 25 μm into a ball mill, add 200 ml of water, and ball mill for 10 hours;

[0050] 2) ultrasonically disperse 10 g of graphite and 1.1 g of polyacrylic acid in 30 ml of water to obtain the first carbon coating layer dispersion;

[0051] 3) adding the first carbon coating layer dispersion in step 2) into step 1), and continuing ball milling for 3 hours to obtain nanometerized silicon particles uniformly dispersed in the first carbon coating layer;

[0052] 4) spray drying to remove the moisture in the product of step 3) to obtain a solid;

[0053] 5) Carrying out high-temperature carbonization treatment of the solid in step 4) under a nitrogen atmosphere at a heating rate of 10° C. / min, and maintaining at 700° C. for 3 hours to ob...

Embodiment 3

[0060] A method for preparing a lithium-ion battery silicon negative electrode material with starch as the first carbon coating and multi-layer graphene as the second coating, the steps comprising:

[0061] 1) Add 60 grams of silicon powder with a D50 of 15 μm into the ball mill, add 150 ml of water, and ball mill for 7 hours;

[0062] 2) ultrasonically disperse 6g of starch in 50ml of water to obtain the first carbon coating dispersion;

[0063] 3) adding the starch dispersion in step 2) to step 1), and continuing ball milling for 3 hours to obtain nano-sized silicon particles uniformly dispersed in the first carbon coating solution;

[0064] 4) spray drying to remove the moisture in the dispersion liquid of nano-silicon and starch obtained in step 3) to obtain a solid;

[0065] 5) Carrying out high-temperature carbonization treatment of the solid in step 4) under a nitrogen atmosphere at a heating rate of 6° C. / min, and maintaining at 850° C. for 5 hours to obtain a primary...

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Abstract

The invention provides a preparation method for a carbon-coated silicon negative electrode material for a lithium ion battery. The negative electrode material for the lithium ion battery with excellent performance is obtained from silicon powder by two times of carbon coating; the preparation method comprises the following steps of carrying out liquid phase dispersion on the silicon powder, then carrying out dispersion on the silicon powder, the first carbon coating layer and a dispersing agent; removing the solvent, and carrying out high-temperature carbonization treatment on the obtained solid material to obtain primary carbon-coated silicon negative electrode material; preparing a dispersion solution of a second carbon-coated material, dispersing the primary carbon-coated silicon material to the dispersion solution of the second carbon-coated material, and then removing the solvent and carrying out secondary roasting to obtain the secondary carbon-coated silicon negative electrode material. According to the preparation method, the raw materials are low in cost and easily available; the ratio of silicon to carbon can be optionally regulated and controlled; and the preparation method is simple in equipment, easy to implement the technological process, and suitable for scale production.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a method for preparing a carbon-coated silicon negative electrode material of a lithium-ion battery. Background technique [0002] Due to the development of electronic products, especially smart phones and new energy vehicles, the energy density of lithium-ion batteries is getting higher and higher. At present, the theoretical specific capacity of lithium-ion batteries using graphite and other carbon materials as negative electrodes is only 375mAh / g, poor safety performance, far from meeting people's increasing demands. For example, at present, due to its multiple functions and fast power consumption, smart phones need to be charged almost every few hours, which brings a lot of inconvenience to people's travel and life. Environmental problems and energy crisis have prompted countries to vigorously develop new energy vehicles, but short driving range, insufficient po...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈永胜随东谢玉青徐艳红
Owner 天津普兰能源科技有限公司
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