Method for preparing carbon-coated porous silicon material for lithium battery electrode

A porous silicon and carbon coating technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor conductivity and volume expansion, achieve good battery performance, alleviate poor conductivity, and be conducive to large-scale industrial production Effect

Pending Publication Date: 2019-09-20
SHANGHAI UNIV
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Problems solved by technology

[0007] In order to solve the above existing problems in the prior art, the present invention proposes a simple and low-cost method for preparing carbon-coated porous silicon materials for lithium battery electrodes to improve the poor conductivity and serious volume expansion of silicon materials, and obtain Anode material for lithium-ion battery electrodes with high specific capacity and good cycle performance

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  • Method for preparing carbon-coated porous silicon material for lithium battery electrode

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Embodiment 1

[0027] A method for preparing a carbon-coated porous silicon material for lithium battery electrodes, comprising the following steps:

[0028] 1) Using silicon powder with an average particle size of 15um as the raw material, pretreatment is performed first to remove oil stains and impurities on the surface of the silicon powder, and then the silicon powder is put into an ethanol solution and ultrasonicated for 30 minutes, and then put into deionized water for 30 minutes. , and finally dried in an oven for 5 hours for later use;

[0029] 2) Preparation of porous silicon, including: the first step, preparing a mixed solution containing 10mol / L hydrofluoric acid and 0.005mol / L silver nitrate, adding the silicon powder obtained in the step 1) to it, stirring and reacting at 20°C 10min, after the reaction is completed, wash with deionized water and suction filter, and dry to obtain silicon particles whose surface is modified by Ag particles; in the second step, put the silicon par...

Embodiment 2

[0033] A method for preparing a carbon-coated porous silicon material for lithium battery electrodes, comprising the following steps:

[0034] 1) Using silicon powder with an average particle size of 5um as the raw material, pretreatment is performed to remove oil stains and impurities on the surface of the silicon powder, and then the silicon powder is put into an acetone solution and ultrasonicated for 80 minutes, and then put into deionized water for 80 minutes. , and finally dried in an oven for 10 hours for later use;

[0035]2) Preparation of porous silicon, including: the first step, plating Ag on the silicon surface, first preparing a reducing agent, first mixing 15g / L glucose and 8g / L potassium sodium tartrate to boil, then adding 30ml / L ethanol and 12ml / L Polyethylene glycol is used to prepare the reducing agent, then mix 3g / L silver nitrate with 25ml / L ammonia water, 10ml / L ethylenediamine, and 10g / L potassium hydroxide to obtain the main salt, mix the main salt and...

Embodiment 3

[0039] A method for preparing a carbon-coated porous silicon material for lithium battery electrodes, comprising the following steps:

[0040] 1) Using silicon powder with an average particle size of 10um as the raw material, pretreatment is performed first to remove oil stains and impurities on the surface of the silicon powder, and then the silicon powder is put into an ethanol solution and ultrasonicated for 50 minutes, and then put into deionized water for 30 minutes. , and finally dried in an oven for 10 hours for later use;

[0041] 2) preparing porous silicon, including: the first step, evenly spread the silicon powder on the rotating sample stage, use high-purity Ag as the target material, turn on the instrument switch, and obtain the silicon material modified by Ag particles after sputtering; second The first step is to put the Ag particle-modified silicon particles into a mixed solution of 0.6 mol / L hydrogen peroxide and 0.8 mol / L hydrofluoric acid, etch at 25°C for ...

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Abstract

The invention discloses a method for preparing a carbon-coated porous silicon material for a lithium battery electrode; the carbon-coated porous silicon material is prepared by combining two effective methods of forming a porous structure and carbon-coated silicon on a silicon material, so that the problem of the silicon electrode material is effectively solved.

Description

technical field [0001] The invention relates to a method for preparing a carbon-coated porous silicon material for lithium battery electrodes. Background technique [0002] At present, lithium-ion batteries are considered to be the most commercially valuable energy storage system because of their long cycle life, light weight, no memory effect, and environmental friendliness. However, with the rapid development of large-scale energy storage facilities and electric vehicles, the demand for lithium-ion batteries with higher specific capacity and better battery performance is also increasing. The main components of lithium-ion batteries include positive electrodes, negative electrodes, electrolytes, separators, etc. Among them, the negative electrode material is also one of the important factors affecting the performance of lithium-ion batteries. [0003] Among the existing negative electrode materials, silicon material has the highest theoretical specific capacity (4200mAh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/628H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 李爱军赵添婷朱德伦张丹
Owner SHANGHAI UNIV
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