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Silicon-carbon composite negative electrode material and preparation method thereof

A technology of silicon-carbon composite and negative electrode materials, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems affecting the electrochemical performance, cycle performance, rate performance deviation, lithium Solve problems such as slow ion intercalation speed, achieve the effects of improving structural stability and cycle performance, improving compatibility, improving transmission rate and first-time efficiency

Active Publication Date: 2020-09-29
乌兰察布市大盛石墨新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode material has the problems of slow intercalation of lithium ions during charge and discharge and high expansion rate under high rate conditions, which leads to deviations in cycle performance and rate performance, and ultimately affects the electrochemical performance of silicon carbon negative electrode materials.

Method used

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  • Silicon-carbon composite negative electrode material and preparation method thereof
  • Silicon-carbon composite negative electrode material and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing a silicon-carbon composite negative electrode material, which includes the following steps:

[0027] S1, adding porous carbon material and additives to an organic solvent to obtain a first mixture;

[0028] S2, adding a lithium salt to the first mixture to obtain a second mixture;

[0029] S3, adding nano-silicon to the second mixture, after dispersion, adding a binder to obtain a third mixture, and spray-drying the three mixtures to obtain a silicon-carbon composite precursor; and

[0030] S4, carbonizing the silicon-carbon composite precursor to obtain a silicon-carbon composite negative electrode material.

[0031] In step S1, the organic solvent is methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol, tert-butanol, 1-pentanol, 1,2 -Ethylene glycol, 1,2-propanediol, 2-methoxyethanol, 2-ethoxyethanol, acetone, 2-pentanone, 3-pentanone, 2-hexanone, 2-heptanone, 4-heptanone Ketone, diis...

Embodiment 1

[0046] 1) Add 5g of asphalt into 200mL of anhydrous carbon tetrachloride, stir and dissolve to obtain mixture A;

[0047] 2) 20g of anhydrous aluminum trichloride is placed in the reaction kettle, add 50mL of anhydrous carbon tetrachloride (the total consumption of anhydrous carbon tetrachloride is 250mL), after the anhydrous aluminum trichloride is dissolved, Then add the mixture A obtained in step 1), heat to 50°C under stirring conditions, and carry out the Friedel-Crafts reaction under reflux. After reacting for 24 hours, add 300mL of ethanol as a reaction terminator to terminate the reaction, and the mixed system obtained from the reaction is successively filtered, washed, After filtering and drying, the porous carbon material B is obtained.

[0048] 3) Weigh 20g of porous carbon-based material B and 3g of sodium fluoride and add it to 300mL of isobutanol, and disperse evenly;

[0049] 4) Add 3g of lithium metaaluminate and disperse evenly to obtain porous carbon-based m...

Embodiment 2

[0052] The preparation of the porous carbon material B is the same as that of Example 1, and will not be repeated here.

[0053] 1) Weigh 10g of porous carbon-based material B and 1g of potassium fluoride, add it to 100mL of diethyl ether organic solvent, and disperse evenly;

[0054] 2) Add 1g of lithium zirconate and disperse evenly to obtain porous carbon-based mixed liquid C';

[0055] 3) Then weigh 1g of nano-silica powder (particle size 100nm) and add it to the porous carbon-based mixed liquid C', then add 0.5g of ethylene-tetrafluoroethylene copolymer, and after high-speed dispersion and uniform dispersion, it is prepared by spray drying technology The precursor of the spherical silicon-carbon composite negative electrode material is then carbonized at 850° C. for 6 hours, pulverized and classified to obtain the silicon-carbon composite negative electrode material.

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Abstract

The invention relates to a silicon-carbon composite negative electrode material. The silicon-carbon composite negative electrode material has a core-shell structure and comprises an inner core part and a shell part coated on the inner core part, wherein the inner core part is nano silicon, and the shell part is a composite structure containing a porous carbon material and a lithium salt. The invention further provides a preparation method of the silicon-carbon composite negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] As the market demand for high-energy-density lithium-ion batteries increases, lithium-ion battery anode materials are required to have higher mass and volumetric energy densities. At present, the negative electrode materials in the market are mainly graphite (theoretical capacity 372mAh / g), but its actual specific capacity is close to the theoretical capacity, and it is difficult to greatly increase it, which limits the improvement of the energy density of negative electrode materials. [0003] Silicon carbon anode material is a new type of anode material developed in recent years, which has the advantages of high specific capacity, low price, and wide sources. However, due to the poor electrical conductivity of the silicon material itself, and the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 张彬赵磊
Owner 乌兰察布市大盛石墨新材料股份有限公司
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