A kind of nitrogen self-doping carbon-coated silicon oxide negative electrode material, preparation method and application thereof

A silicon oxide and negative electrode material technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of difficult control of cost and component content, unsuitable for large-scale industrial production, poor cycle stability and other problems, and achieve good Electronic conductivity, improved performance, and strong stability

Active Publication Date: 2022-03-11
云南锂宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The silicon-based negative electrode material described in this invention is mixed with various metal elements, inorganic elements and graphene, and its composition is complex. The purpose is to improve the transmission efficiency of electrons and ions, but the required cost and composition content are not easy to control, and it is not suitable for large-scale Industrialized production, suitable for laboratory-scale production, and the potential risk of battery explosion due to the mixing of various metals, its cycle stability is poor, and the theoretical specific capacity is low

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  • A kind of nitrogen self-doping carbon-coated silicon oxide negative electrode material, preparation method and application thereof
  • A kind of nitrogen self-doping carbon-coated silicon oxide negative electrode material, preparation method and application thereof

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Embodiment 1

[0030] This embodiment 1 provides a method for preparing a nitrogen self-doped carbon-coated silicon oxide negative electrode material, which specifically includes the following steps:

[0031] (1) Take 40mL of trimethylbenzene and 10mL of di-block copolymer or tri-block copolymer, the mass ratio is 1:0.4, put into 200ml of 50% alcohol aqueous solution, the speed is 200r / min, and stir;

[0032] (2) Dissolve 2 g of dopamine in 200 mL of deionized aqueous solution to form a dopamine aqueous solution, then add the dopamine aqueous solution in equal proportions to step (1), and stir for 2 hours;

[0033] (3) In the mixed solution of step (2), dropwise add ammonia water of 25wt% by weight, adjust the pH to 8, stir for 4h, and polymerize to form a colloidal mixed substance A;

[0034](4) Put the mixed substance A obtained in step (3) with a sufficient amount of ethanol solution in a hydrothermal reaction kettle, conduct a hydrothermal reaction at 120°C for 2-4 hours, and then place ...

Embodiment 2

[0038] This embodiment 2 provides a method for preparing a nitrogen self-doped carbon-coated silicon oxide negative electrode material, which specifically includes the following steps:

[0039] (1) Take 40mL of trimethylbenzene and 10mL of di-block copolymer or tri-block copolymer, the mass ratio is 1:0.4, put into 200ml of 50% alcohol aqueous solution, the speed is 200r / min, and stir;

[0040] (2) Dissolve 2 g of dopamine in 200 mL of deionized aqueous solution to form a dopamine aqueous solution, then add the dopamine aqueous solution in equal proportions to step (1), and stir for 2 hours;

[0041] (3) In the mixed solution of step (2), add dropwise the weight percent of 25wt% ammonia water, adjust the pH to 8, stir for 4h, and polymerize to form a colloidal mixed substance A;

[0042] (4) Put the mixed substance A obtained in step (3) with a sufficient amount of ethanol solution in a hydrothermal reaction kettle, conduct a hydrothermal reaction at 120°C for 2-4 hours, and t...

Embodiment 3

[0046] This embodiment 3 provides a method for preparing a nitrogen self-doped carbon-coated silicon oxide negative electrode material, which specifically includes the following steps:

[0047] (1) Take 4mL of trimethylbenzene and 1mL of diblock copolymer or triblock copolymer, the mass ratio is 1:0.4, put into 20ml of 50% alcohol aqueous solution, and stir at a speed of 200r / min;

[0048] (2) Dissolve 0.2 g of dopamine in 20 mL of deionized aqueous solution to form a dopamine aqueous solution, then add the dopamine aqueous solution into step (1) in equal proportions, and stir for 2 hours;

[0049] (3) In the mixed solution of step (2), add dropwise the weight percent of 25wt% ammonia water, adjust the pH to 8, stir for 4h, and polymerize to form a colloidal mixed substance A;

[0050] (4) Put the mixed substance A obtained in step (3) with a sufficient amount of ethanol solution in a hydrothermal reaction kettle, conduct a hydrothermal reaction at 120°C for 2-4 hours, and the...

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Abstract

The invention discloses a nitrogen self-doping carbon-coated silicon oxide negative electrode material and its preparation method and application. The preparation method of the nitrogen self-doping carbon-coated silicon oxide negative electrode material first passes trimethylbenzene in an alcohol aqueous solution The block copolymer is combined with dopamine or acrylate monomer, and then the pH is adjusted so that the dopamine / acrylate monomer self-polymerizes on the outer layer of trimethylbenzene, and the block copolymer is used as a buffer layer, and then the block is removed by alcohol washing Copolymer and trimethylbenzene, and then form a nitrogen self-doped carbon coating layer by high-temperature carbonization, and then put silicon dioxide into the coating layer in the form of a salt solution, and then obtain a nitrogen self-doped carbon coating layer by magnesia thermal reduction reaction Coated silicon negative electrode material, which has high theoretical specific capacity and good cycle stability, and has a certain degree of stretching elasticity, and can alleviate the volume expansion and contraction caused by silicon oxide when deintercalating lithium, effectively overcoming the silicon volume. Loss and chalking results from expansion and contraction.

Description

technical field [0001] The invention relates to the technical field of battery negative electrode materials, in particular to a nitrogen self-doped carbon-coated silicon oxide negative electrode material and a preparation method and application thereof. Background technique [0002] With the advantages of high energy density, long life, and environmental friendliness, lithium-ion batteries are one of the most attractive energy storage devices today and play an increasingly important role in modern society. Lithium-silicon (Li-Si) batteries It has been extensively studied due to its excellent electrochemical energy storage performance. However, their practical applications are largely hampered by several major issues. The expansion and pulverization of simple silicon are the most important limiting factors hindering the commercial application of lithium-silicon batteries. The problem of volume expansion during cycling is always a problem. Significant challenges facing silico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCH01M4/483H01M4/625H01M4/628H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 张亚光王振
Owner 云南锂宸新材料科技有限公司
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