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Lithium ion battery silicon-based composite anode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle performance, and achieve high specific capacity and good cycle performance

Inactive Publication Date: 2013-06-05
NINGBO SHANSHAN NEW MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a silicon-based composite negative electrode material with high specific capacity and good cycle performance for lithium-ion batteries and its preparation method in order to overcome the defects of poor cycle performance of existing silicon-containing composite materials

Method used

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  • Lithium ion battery silicon-based composite anode material and preparation method thereof
  • Lithium ion battery silicon-based composite anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] Silica fume (D 50 =2.6μm) 125g, artificial graphite 500g (purchased from Shanghai Shanshan Technology Co., Ltd., trade name is YT7-38, D 50 =26μm), 12.5g of polyvinylpyrrolidone mixed with 5L of water, ultra-fine grinding for 6 hours to the average particle size D of the particles in the slurry 50 462nm, the feed rate of the spray drying equipment is set to 3.6Kg / h, the air inlet and outlet temperatures are 260°C and 120°C respectively, and the slurry is sprayed and granulated after ball milling to obtain the average particle size D 50 It is a spherical particle of 5.8 μm, which is mixed with 4L sodium carboxymethylcellulose aqueous solution at room temperature, wherein sodium carboxymethylcellulose accounts for 1wt% of the total weight of silicon powder and graphite, stirred for 2 hours at 80rpm, and centrifuged at 4000rpm The obtained granules are vacuum-dried at 90°C and sieved with 400 mesh to obtain the average particle size D 50 Silicon-based composite anode mat...

Embodiment 2

[0044] Silica fume (D 50 =2.6 μm) 75g, natural graphite 500g (purchased from Shanghai Shanshan Science and Technology Co., Ltd., trade name is MGS-2, D 50 =18μm), 17.3.g polyvinylpyrrolidone mixed with 5L water, ultra-fine grinding for 6 hours to the average particle diameter D of the particles in the slurry 50 425nm, the feed rate of the spray drying equipment is set to 3.9Kg / h, the air inlet and outlet temperatures are 220°C and 100°C respectively, and the slurry is sprayed and granulated after ball milling to obtain the average particle size D 50 It is a spherical particle of 6.1 μm, mixed with 4L sodium carboxymethylcellulose aqueous solution at room temperature, wherein sodium carboxymethylcellulose accounts for 3wt% of the total weight of silicon powder and graphite, stirred at 80rpm for 2 hours, and centrifuged at 4800rpm to obtain The particles were vacuum dried at 100°C and sieved with 400 mesh to obtain the average particle size D 50It is a silicon-based composite ...

Embodiment 3

[0046] Silica fume (D 50 =2.6μm) 100g, artificial graphite 500g (purchased from Shanghai Shanshan Technology Co., Ltd., trade name is YT7-38, D 50 =26μm) and 30g polyvinyl alcohol in 5L water for ultrafine grinding for 6 hours to the average particle diameter D of the particles in the slurry 50 492nm, the feed rate of the spray drying equipment is set to 3.8Kg / h, the air inlet and outlet temperatures are 250°C and 110°C respectively, and the slurry is sprayed and granulated after ball milling to obtain the average particle size D 50 It is a spherical particle of 5.8 μm, which is mixed with 4L sodium carboxymethylcellulose aqueous solution at room temperature, wherein sodium carboxymethylcellulose accounts for 2wt% of the total weight of silicon powder and graphite, stirred at 100rpm for 2 hours, and centrifuged at 4600rpm to obtain The particles were vacuum dried at 100°C and sieved with 400 mesh to obtain the average particle size D 50 It is a silicon-based composite negati...

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Abstract

The invention discloses a preparation method of a lithium ion battery silicon-based composite anode material, which comprises the following steps: (1) mixing silicon powder, graphite, a dispersant and water to obtain slurry, wherein the average particle size D50 of the silicon powder and graphite is 380-500 nm; (2) performing spray granulation to obtain particles; (3) mixing a sodium carboxymethylcellulose aqueous solution with a mass volume concentration of 1.5-4.7 g / L with the particles, wherein the using amount of sodium carboxymethylcellulose is 1-3 wt% of the total amount of the silicon powder and the graphite, stirring, performing centrifugation separation, drying, sieving by using a sieve of more than 400 meshes to obtain the undersize. The invention also discloses a lithium ion battery silicon-based composite anode material prepared by the method, which has a high specific capacity, and good cycle performance.

Description

technical field [0001] The invention relates to the field of battery electrode materials, in particular to a silicon-based composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] With the development of social science and technology, people's demand for lithium-ion batteries with high specific energy, high power and long cycle life is increasing. Anode materials play an important role in improving the performance of lithium-ion batteries. At present, the anodes of commercial lithium-ion batteries are generally graphite materials or carbon-based materials, and their theoretical specific capacity is 372mAh / g, which cannot meet people's needs for high-capacity electrodes. need. Silicon and silicon-containing materials are considered to be a promising anode material with a theoretical specific capacity of up to 4200mAh / g, but the large volume effect of the silicon anode during lithium intercalation and extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 王洁平刘萍乔永民沈龙董爱想谢秋生刘雪辉
Owner NINGBO SHANSHAN NEW MATERIAL TECH