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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  • Abstract
  • 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. M

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

Examples

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Example Embodiment

[0043] In the present application, the present invention also provides a method of preparing a composite negative electrode material for a lithium ion battery, the composite anode material comprising a composite negative electrode material for a lithium ion battery as described above, wherein the method comprnt step :

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

[0045] The carbonaceous material precursor was sintered in the inert gas environment for 2 h-5 h at 300 ° C to 500 ° C, and the first burning material was obtained;

[0046] The first burning rear material is soaked using dilute hydrochloric acid, and then the first burning material is cleaned until the pH of the soaking solution is 6-8, and the first purge is obtained;

[0047] The first purified material was sintered and the second burning material was obtained in an inert gas environment.

[0048] The second burning material is pulverized and the carbonaceous materi...

Example Embodiment

[0056] Example 1

[0057] In the present application embodiment, the method of preparing a composite negative material for a lithium ion battery according to the present application includes the following steps:

[0058] (1) Take 1 kg of coconut shell crude material (carbonaceous material precursor) in the box, into nitrogen, until the oxygen content in the box furnace is less than 100 ppm, then warmed up to 300 at 3 ° / min At ° C, calcined for 5 h, 0.34 kg of burning rear material. The burn was placed in dilute hydrochloric acid, repeatedly washed, remove impurities, and then rinsed with pure water until the pH of the solution was 6 to 8, dried. The dried material was placed in a box furnace, and nitrogen was introduced until the oxygen content in the box furnace was less than 100 ppm, and then heated at 3 ° / min to 1300 ° C, sintered 2 h. The burning rear material was pulverized, and the particle size D50 after pulverization was 3 ± 1 μm to obtain a carbonaceous material.

[0...

Example Embodiment

[0062] Example 2

[0063] The difference from the first embodiment is that the precursor of the carbonaceous material in the step (1) is a phenol resin, a low temperature sintering temperature of 350 ° C, sintered 4h; high temperature sintering temperature is 1200 ° C, sintering 3H; burn material pulverized particle size D50 is 5 ± 1 μM to obtain a carbonaceous material.

[0064] The step (2) is used in the liquid phase composite, and the carbonaceous material and the silicon oxide are added to the ethanol solution to the ethanol solution, and the mix is ​​mixed, and then dried to obtain a composite powder.

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

[0066] Among the composite negative electrode materials, the proportion of carbonaceous materials is 72.0 wt.%, And the proportion of silicon particles is 18 wt.% And coated carbo...

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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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