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Silicon-based negative electrode material for lithium ion battery and preparation method thereof

A technology for silicon-based negative electrode materials and lithium-ion batteries, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as low compaction density and easy crushing, and achieve improved electronic conductivity, simple process, and improved The effect of cycle stability

Inactive Publication Date: 2018-06-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compaction density of this material is low, and it is easy to be crushed during the battery manufacturing process.

Method used

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  • Silicon-based negative electrode material for lithium ion battery and preparation method thereof
  • Silicon-based negative electrode material for lithium ion battery and preparation method thereof
  • Silicon-based negative electrode material for lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0026] A silicon-based negative electrode material for a lithium-ion battery proposed by the present invention, the silicon-based negative electrode material includes an amorphous silicon dioxide substrate 2, a plurality of nano-silicon cores 1, a carbon coating layer 3 and a LiF coating layer 4;

[0027] Among them, a plurality of nano-silicon cores 1 are embedded in the amorphous silica matrix 2, the carbon coating layer 3 is coated on the amorphous silica matrix 2, and the LiF coating layer 4 is coated on the carbon coating layer 3. ;

[0028] The carbon coating layer 3 has a thickness of 100 nm, and the LiF coating layer 4 has a thickness of 1 nm.

[0029] A kind of preparation method of described lithium-ion battery silicon-based negative electrode material that the present invention proposes, comprises the following steps:

[0030] S1. Add 1g of nano-silica powder into 357ml of 0.1mol / L NaOH solution, react for 10min, add 0.3g of citric acid, stir and evaporate the solu...

Embodiment 2

[0034] A silicon-based negative electrode material for a lithium-ion battery proposed by the present invention, the silicon-based negative electrode material includes an amorphous silicon dioxide substrate 2, a plurality of nano-silicon cores 1, a carbon coating layer 3 and a LiF coating layer 4;

[0035] Among them, a plurality of nano-silicon cores 1 are embedded in the amorphous silica matrix 2, the carbon coating layer 3 is coated on the amorphous silica matrix 2, and the LiF coating layer 4 is coated on the carbon coating layer 3. ;

[0036] The carbon coating layer 3 has a thickness of 1 nm, and the LiF coating layer 4 has a thickness of 50 nm.

[0037] A kind of preparation method of described lithium-ion battery silicon-based negative electrode material that the present invention proposes, comprises the following steps:

[0038] S1. Add 1g of nano-silica powder into 8.9ml of 1mol / L NaOH solution, react for 10min, add 0.03g of citric acid, stir and evaporate the soluti...

Embodiment 3

[0041] A silicon-based negative electrode material for a lithium-ion battery proposed by the present invention, the silicon-based negative electrode material includes an amorphous silicon dioxide substrate 2, a plurality of nano-silicon cores 1, a carbon coating layer 3 and a LiF coating layer 4;

[0042] Among them, a plurality of nano-silicon cores 1 are embedded in the amorphous silica matrix 2, the carbon coating layer 3 is coated on the amorphous silica matrix 2, and the LiF coating layer 4 is coated on the carbon coating layer 3. ;

[0043] The carbon coating layer 3 has a thickness of 40 nm, and the LiF coating layer 4 has a thickness of 35 nm.

[0044] A kind of preparation method of described lithium-ion battery silicon-based negative electrode material that the present invention proposes, comprises the following steps:

[0045] S1. Add 1g of nano-silica powder into 200ml of 0.1mol / L KOH solution, react for 10min, add 0.15g of citric acid, stir and evaporate the solu...

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Abstract

The invention discloses a silicon-based negative electrode material for a lithium ion battery. The silicon-based negative electrode material comprises an amorphous silica matrix, a plurality of nanometer silicon nucleuses, a carbon coating and a LiF coating, wherein the plurality of nanometer silicon nucleuses are embedded into the amorphous silica matrix; the carbon coating coats the amorphous silica matrix; and the LiF coating coats the carbon coating. The invention also provides a preparation method for the silicon-based negative electrode material. The preparation method comprises the following steps: adding nanometer silicon powder into an alkaline solution, adding a carbon source, evaporating the solution to dryness and then carrying out drying so as to obtain an intermediate material; and sintering the intermediate material under the protection of inert gas, then uniformly dispersing the intermediate material in a lithium acetate solution, adding an ammonium fluoride solution, carrying out a hydrothermal reaction and then carrying out washing, filtering and drying. The preparation method provided by the invention is simple in process and easy for large-scale production; andthe prepared negative electrode material is small in volume expansion, high in electron conductivity, low in internal resistance and good in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a silicon-based negative electrode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] With the development of electric vehicles and portable appliances, the demand for lithium-ion batteries with high energy density is also increasing. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is difficult to meet market demand. The first gram capacity of silicon materials is 4200mAh / g, the lithium intercalation platform is higher, the earth's crust is abundant, and it is environmentally friendly, which has gradually attracted widespread attention of researchers. [0003] However, the volume expansion of silicon is as high as 300%. During the cycle, it will not only cause silicon to separate from the surrounding conductive carbon network to form "dead silicon", but also ca...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/62H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王辉谢李昭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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