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Composite negative electrode material for lithium ion battery, and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of high rate continuous charge and discharge capacity and low temperature performance, low specific capacity of graphite negative electrode, etc., to achieve excellent cycle performance, improve rate, increase The effect of structural stability

Inactive Publication Date: 2021-06-15
赣州立探新能源科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Lithium-ion batteries are widely used in the fields of 3C consumer, power and energy storage batteries due to their good stability, high energy density and no memory effect. At present, the commercial lithium-ion battery composite negative electrode materials are mainly graphite negative electrodes. Mainly, but the theoretical specific capacity of graphite negative electrode is low, only 372mAh / g, and it is difficult to effectively improve the high-rate continuous charge-discharge capability and low-temperature performance. Lithium-ion battery anode materials are an important direction of current research

Method used

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  • Composite negative electrode material for lithium ion battery, and preparation method thereof
  • Composite negative electrode material for lithium ion battery, and preparation method thereof
  • Composite negative electrode material for lithium ion battery, and preparation method thereof

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preparation example Construction

[0043] In the embodiment of the present application, the present invention also provides a preparation method of a composite negative electrode material for a lithium ion battery, the composite negative electrode material includes the composite negative electrode material for a lithium ion battery as described above, and the method includes the steps :

[0044] Prepare carbonaceous material precursors, silicon particles and carbon source materials;

[0045] Sintering the carbonaceous material precursor at a low temperature of 300°C-500°C for 2h-5h in an inert gas environment to obtain the first fired material;

[0046] Soaking the first burnt material with dilute hydrochloric acid, then washing the first burnt material with pure water until the pH value of the soaking solution is 6-8, and obtaining the first purified material;

[0047] Sintering the first purified material at a high temperature of 1000°C-1300°C for 2h-5h in an inert gas environment to obtain a second burnt ma...

Embodiment 1

[0057] In the embodiment of the present application, the preparation method of a composite negative electrode material for a lithium-ion battery provided by the present application specifically includes the following steps:

[0058] (1) Get 1kg of coarse coconut shell material (carbonaceous material precursor) and place it in a box-type furnace, feed nitrogen until the oxygen content in the box-type furnace is lower than 100ppm, and then heat up to 300°C at 3° / min. ℃, calcined for 5 hours, and obtained 0.34 kg of burnt material. The burned material is placed in dilute hydrochloric acid, washed repeatedly to remove impurities, and then rinsed with pure water until the pH value of the solution is 6-8, and then dried. The dried material was placed in a box furnace, and nitrogen gas was introduced until the oxygen content in the box furnace was lower than 100ppm, then the temperature was raised to 1300°C at 3° / min, and sintered for 2 hours. The burned material is crushed, and the...

Embodiment 2

[0063] The difference from Example 1 is that the carbonaceous material precursor in step (1) is phenolic resin, the low-temperature sintering temperature is 350°C, and the sintering is 4h; the high-temperature sintering temperature is 1200°C, and the sintering is 3h; ±1 μm, to obtain carbonaceous materials.

[0064] Step (2) uses liquid phase compounding, adding carbonaceous material and silicon oxide into the ethanol solution at a mass ratio of 8:2, stirring evenly, and then drying to obtain composite powder.

[0065] The carbon source gas used in step (3) is acetylene, the treatment temperature is 800°C, and the content of deposited carbon is controlled to be 10wt.%, to obtain a composite negative electrode material.

[0066] In the composite negative electrode material, the proportion of carbonaceous material is 72.0wt.%, the proportion of silicon particles is 18wt.%, and the proportion of coated carbon is 10wt.%.

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Abstract

The invention discloses a composite negative electrode material for a lithium ion battery, and a preparation method thereof. The composite negative electrode material comprises a carbonaceous material, silicon particles and coated carbon, and the carbonaceous material is not subjected to graphitization treatment and has a disordered microcrystalline structure; the size of silicon grains in the silicon particles is smaller than 15 nm; and the coated carbon is amorphous carbon formed by cracking a carbon source material in a high-temperature state, and at least parts of the surfaces of the carbonaceous material and the silicon particles are covered by the coated carbon. Compared with graphite, the composite negative electrode material prepared by the invention has the advantages that the carbonaceous material can obviously improve the multiplying power and has low-temperature performance and long cycle performance, the silicon particles can obviously improve the specific capacity of the composite negative electrode material, and the coated carbon can reduce the early-stage lithium ion loss and improve the structural stability of the material; and the first reversible capacity of the composite negative electrode material reaches 600 mAh / g or above, the first efficiency is more than 85%, the price of raw materials is low, the preparation process and equipment are mature, and the composite negative electrode material is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of 3C consumer, power and energy storage batteries due to their good stability, high energy density and no memory effect. At present, the commercial lithium-ion battery composite negative electrode materials are mainly graphite negative electrodes. Mainly, but the theoretical specific capacity of graphite negative electrode is low, only 372mAh / g, and it is difficult to effectively improve the high-rate continuous charge-discharge capability and low-temperature performance. Lithium-ion battery anode materials are an important direction of current research. Contents of the invention [0003] In order to solve the above problems, the present invention provides a composite neg...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525C01B32/05C01B33/02
CPCH01M4/366H01M4/587H01M4/386H01M4/625H01M10/0525C01B32/05C01B33/02Y02E60/10
Inventor 阳柳王燕飞周桂民
Owner 赣州立探新能源科技有限公司
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