Carbon-silicon negative electrode material and preparation method thereof

A technology of negative electrode material and porous carbon material, which is applied in the field of carbon silicon negative electrode material and its preparation, can solve the problems of volume expansion of silicon material and the production cost of nano-silicon easy to agglomerate, so as to ensure stability, alleviate volume expansion, and overcome production cost. high effect

Pending Publication Date: 2020-12-08
利普同呈(江苏)新能源科技有限公司 +1
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Problems solved by technology

[0004] In order to solve the problems of volume expansion of silicon material, easy agglomeration of nano-silicon and high preparation cost in the existing negative electrode materials of lithium-ion batteries, the present invention provides a new carbon-silicon negative electrode material and its preparation method

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  • Carbon-silicon negative electrode material and preparation method thereof
  • Carbon-silicon negative electrode material and preparation method thereof

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preparation example Construction

[0034] Embodiments of the present invention provide a method for preparing a carbon-silicon negative electrode material, comprising the steps of:

[0035] S1. Impregnating the porous carbon material with the organosilicon solution, adding alcohol or water to react, and drying the product after the reaction to obtain the first precursor.

[0036] Wherein, the solute concentration of the organosilicon solution is 10%-100%. Wherein, the solute of the organosilicon solution is an organosilicon compound, specifically, halosilane and / or ethyl orthosilicate can be selected, and the solvent of the organosilicon solution is an organic solvent, specifically, n-hexane, n-heptane, At least one of n-pentane and benzene.

[0037] The porous carbon material is at least one of porous artificial graphite, porous natural graphite, porous hard carbon, porous soft carbon and porous mesocarbon microspheres.

[0038] A porous carbon material having a particle diameter of 1 μm to 20 μm is preferre...

Embodiment 1

[0069] (1) Add porous artificial graphite and silicon tetrachloride (volume concentration: 99.5%) into the reaction kettle at a mass ratio of 1:0.6, stir to completely infiltrate the silicon tetrachloride solution into the pores of the graphite, and slowly add to the graphite pores during stirring. The ionized water was hydrolyzed, and after the reaction was completed, it was heated to 50°C, the residual solution was evaporated, and then the temperature was raised to 200°C, and kept for 1 hour to obtain the loaded nano-SiO 2 The graphite material is called precursor A.

[0070] (2) Mix the precursor A and magnesium powder in step (1) at a mass ratio of 1:0.8, mix evenly, place in a sintering furnace, and calcine under an argon atmosphere at a calcination temperature of 700°C. After holding for 4 hours, Cool to room temperature with the furnace. Then the resultant was washed with acid, and then washed with deionized water until neutral to obtain a graphite material loaded with...

Embodiment 2

[0075] (1) Add porous artificial graphite and silicon tetrachloride (volume concentration 99.5%) into the reaction kettle at a mass ratio of 1:3, stir to completely infiltrate the silicon tetrachloride solution into the graphite pores, and slowly add ethanol during the stirring process Carry out the hydrolysis reaction, heat to 80°C after the reaction is completed, evaporate the residual solution, then raise the temperature to 100°C, and keep it for 3 hours to obtain the loaded nano-SiO 2 The graphite material is called precursor A.

[0076] (2) Mix the precursor A of step (1) with the aluminum powder at a mass ratio of 1:4, mix evenly, place in a sintering furnace, and calcine under a mixed atmosphere of argon and hydrogen, with a hydrogen concentration of 5%, and calcine The temperature is 400°C, after 8 hours of heat preservation, it is cooled to room temperature with the furnace, and the product is washed with acid and deionized water to neutrality to obtain a graphite mat...

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Abstract

The invention discloses a carbon-silicon negative electrode material and a preparation method thereof.The carbon-silicon negative electrode material is of a core-shell structure with a core part and ashell part, the core part is a porous carbon material loaded with nano-silicon, and the shell part is a conductive carbon layer coating the core part; the conductive carbon layer contains a conductive agent and organic cracked carbon formed by cracking an organic cracking carbon source. According to the preparation method of the carbon-silicon negative electrode material, nano-silicon is loaded on pores and the surface of a porous carbon material, so that the problem of volume expansion of the nano-silicon is relieved; nano-silicon is generated by hydrolyzing an organic silicon source, so that the problems of high preparation cost, agglomeration and the like of the nano-silicon are solved; the organic cracked carbon and a conductive agent are used as a conductive carbon layer to coat theporous carbon material loaded with nano silicon, so that the corrosion of electrolyte is isolated, and the stability of the material structure is ensured. The carbon-silicon negative electrode material disclosed by the invention has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a carbon-silicon negative electrode material and a preparation method thereof. Background technique [0002] At present, most of the negative electrode materials of commercial lithium-ion batteries use graphite carbon materials, which have the characteristics of good cycle stability, long life, low cost, and excellent conductivity, but the capacity is close to the theoretical value of 372mA·h / g, which cannot meet the current requirements. The market demand for high-energy-density lithium-ion batteries is increasing, and it is imminent to develop new high-energy-density, high-performance anode materials. The theoretical capacity of silicon reaches 4200mA h / g, and the delithiation potential platform is low, which is not easy to produce lithium. With better safety performance, it has become one of the most potential lithium-ion battery anode materials. In recent years, si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525C01B33/023
CPCH01M4/366H01M4/386H01M4/628H01M4/625H01M10/0525C01B33/023H01M2004/021H01M2004/027Y02E60/10
Inventor 李春松王亮郑强勇罗旺王峰崔云龙
Owner 利普同呈(江苏)新能源科技有限公司
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