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Copper-aluminum-silicon alloy nanometer negative electrode material of lithium battery and preparation method of negative electrode material

A negative electrode material, silicon alloy technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve poor cycle life and cycle efficiency, poor volume change cycle life, and small specific capacity development potential and other problems to achieve the effect of meeting coating requirements, reasonable particle size distribution, and unique microstructure

Inactive Publication Date: 2018-02-23
산시우테하이머뉴매테리얼스테크놀러지컴퍼니리미티드
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Problems solved by technology

At present, the most common anode materials for commercial lithium batteries are mainly carbon and silicon-carbon materials, which have the advantages of relatively stable cycle performance, high cycle efficiency, safety and pollution-free, etc., but the capacity of carbon materials has approached its Theoretical capacity (372mAh / g), the development potential of the specific capacity is small; silicon-carbon materials are an innovation to carbon materials, adding 3 to 15% silicon to carbon materials makes the negative electrode material have a gram capacity of 420mAh. This method continues to increase the gram capacity and there are technical barriers
The theoretical lithium storage specific capacity of pure silicon is 4200mAh / g, which is the highest among all elements. As a negative electrode material, it can greatly increase the energy density of the battery, but its cycle life and cycle efficiency are far worse than those of carbon materials. The large volume change (>300%) in the delithiation process is the main reason for its poor cycle life. The poor conductivity of silicon is one of the reasons for its low cycle efficiency. The larger the specific surface area of ​​silicon, the higher its cycle efficiency. lower
How to effectively solve the problems of short cycle life and low cycle efficiency of silicon anode materials are two major problems in the world, and there is no feasible technical solution so far
Technologies such as coating carbon, graphene, and titanium on the surface of nano-silicon particles have not fundamentally solved the problem. Even if good research results have been obtained in the laboratory, there is no way to apply it to actual production.

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  • Copper-aluminum-silicon alloy nanometer negative electrode material of lithium battery and preparation method of negative electrode material
  • Copper-aluminum-silicon alloy nanometer negative electrode material of lithium battery and preparation method of negative electrode material
  • Copper-aluminum-silicon alloy nanometer negative electrode material of lithium battery and preparation method of negative electrode material

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Embodiment 1

[0036] Embodiment 1, a copper-aluminum-silicon alloy nano negative electrode material for a lithium battery, which is composed of the following raw materials in parts by weight: 27.5-32 parts of silicon, 58-63 parts of copper, 9-11 parts of aluminum, and 0-5 parts of impurities; The alloy nano-anode material as a whole includes: pores, shrinkage cavities, shrinkage porosity, dislocations, vacancies and cavities with a multi-defect organizational structure, and the particle size is ≤ 80 μm.

[0037] The present embodiment is prepared according to the following steps:

[0038] (1) Ingredients of Cu-Al-Si alloy:

[0039]Cut pure copper into φ50mm×100mm rods, pre-treat with pickling and vacuum drying before use, and control the drying temperature at 110±5°C; cut pure aluminum into 50mm×50mm×30mm small aluminum plates, and use acid before use Washing plus vacuum drying pretreatment, the drying temperature is controlled at 200±5°C; the block size of metal silicon is controlled at 5...

Embodiment 2

[0059] Embodiment 2: a copper-aluminum-silicon alloy nano negative electrode material for a lithium battery, consisting of the following raw materials in parts by weight: 27.5 parts of silicon, 58 parts of copper, 9 parts of aluminum, and 0.5 part of impurities; its preparation method is as follows:

[0060] (1) Ingredients of Cu-Al-Si alloy:

[0061] Cut pure copper into φ50mm×100mm rods, pre-treat with pickling and vacuum drying before use, and control the drying temperature at 110±5°C; cut pure aluminum into 50mm×50mm×30mm small aluminum plates, and use acid before use Washing plus vacuum drying pretreatment, the drying temperature is controlled at 200±5°C; the block size of metal silicon is controlled at 5-30mm, pickling before use to remove surface impurities, and then vacuum drying, the drying temperature is controlled at 180± 5°C. The total weight of the ingredients is 20Kg, 27.5 parts of silicon, 58 parts of copper, 9 parts of aluminum, and 0.5 parts of impurities (in...

Embodiment 3

[0074] Embodiment 3: a copper-aluminum-silicon alloy nano negative electrode material for a lithium battery, consisting of the following raw materials in parts by weight: 32 parts of silicon, 63 parts of copper, 11 parts of aluminum, and 5 parts of impurities; its preparation method is as follows:

[0075] (1) Ingredients of Cu-Al-Si alloy:

[0076]Cut pure copper into φ50mm×100mm rods, pre-treat with pickling and vacuum drying before use, and control the drying temperature at 110±5°C; cut pure aluminum into 50mm×50mm×30mm small aluminum plates, and use acid before use Washing plus vacuum drying pretreatment, the drying temperature is controlled at 200±5°C; the block size of metal silicon is controlled at 5-30mm, pickling before use to remove surface impurities, and then vacuum drying, the drying temperature is controlled at 180± 5°C. The total weight of ingredients is 20Kg, 32 parts of silicon, 63 parts of copper, 11 parts of aluminum, and 5 parts of impurities (including: t...

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Abstract

The invention discloses a copper-aluminum-silicon alloy nanometer negative electrode material of a lithium battery and a preparation method of the negative electrode material, and belongs to the technical field of the negative electrode material of the lithium battery. According to the copper-aluminum-silicon alloy nanometer negative electrode material of the lithium battery and the preparation method of the negative electrode material provided by the invention, a technical scheme is adopted as follows: the copper-aluminum-silicon alloy nanometer negative electrode material of the lithium battery comprises the following raw materials in parts by weight: 27.5-32 parts of silicon, 58-63 parts of copper, 9-11 parts of aluminum and 0-5 parts of impurities; and the overall alloy nanomaterial comprises a multi-defect organization structure of air pores, shrinkage holes, shrinkage porosity, dislocation, vacancy and holes, and the grain diameter is less than or equal to 80[mu]m. The inventioncan be applied to the technical field of the negative electrode material of the lithium battery.

Description

technical field [0001] The invention discloses a copper-aluminum-silicon alloy nanometer negative electrode material for a lithium battery and a preparation method thereof, belonging to the technical field of lithium battery negative electrode materials. Background technique [0002] New materials and clean energy are both key development directions at the national level. Lithium-ion batteries are currently the most widely used energy storage cells in energy storage technology. Improving the energy storage density of cells is the goal pursued by the world. The energy density of cells is The improvement mainly depends on the development and progress of its positive and negative electrode materials, but it is also related to the progress of the positive and negative electrode current collectors, positive and negative electrode binders, electrolytes and separators of lithium-ion batteries. [0003] The core part of the lithium-ion battery is the positive and negative electrode ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/46H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/386H01M4/463H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 王宥宏刘忆恩
Owner 산시우테하이머뉴매테리얼스테크놀러지컴퍼니리미티드
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