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Three-dimensional porous structure silicon/graphene composite negative electrode material and preparation method thereof

A graphene composite, three-dimensional porous technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problem of insufficient cycle life of silicon-carbon composite anode materials, and achieve excellent charge-discharge cycle performance and rate performance, good flexible structure. , the effect of high specific capacity

Inactive Publication Date: 2017-11-03
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present application provides a three-dimensional porous structure silicon / graphene composite negative electrode material and its preparation method, which has a better flexible structure, can effectively accommodate the volume effect of silicon in the charging and discharging process, has good electrical conductivity, and has Excellent charge-discharge cycle performance and rate performance, as well as high first-time Coulombic efficiency, solve the defect of insufficient cycle life of silicon-carbon composite anode materials in the prior art

Method used

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  • Three-dimensional porous structure silicon/graphene composite negative electrode material and preparation method thereof
  • Three-dimensional porous structure silicon/graphene composite negative electrode material and preparation method thereof
  • Three-dimensional porous structure silicon/graphene composite negative electrode material and preparation method thereof

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preparation example Construction

[0035] A method for preparing a three-dimensional porous structure silicon / graphene composite negative electrode material described in the application comprises the following steps:

[0036] (1) Under the condition of 20-30°C, uniformly disperse the nano-silicon in the mixed solution of ethanol and water by electromagnetic stirring to obtain solution A; wherein, the time of the electromagnetic stirring is 10-60min, and the nano-silicon The particle size is 1-150nm, and the volume ratio of ethanol and water is 1: (1-100);

[0037](2) Add carboxymethyl cellulose and organic carbon source to the solution A described in step (1), mix well to obtain solution B, adjust the pH value to the solution B is alkaline; wherein, carboxymethyl cellulose The mass ratio of nano-silicon in solution A is (0.01-1): 1, and the organic carbon source is selected from at least one of phenolic resin, polypyrrole, polyvinyl alcohol, glucose, and sucrose;

[0038] (3) Mix alkaline solution B and graphe...

Embodiment 1

[0043] The preparation method of a kind of three-dimensional porous structure silicon / graphene composite negative electrode material described in this embodiment comprises the following steps:

[0044] (1) At room temperature, 200 mg of nano-silicon with a particle size of 20 nm was dispersed in a mixed solution of 30 mL of ethanol and water, wherein the volume ratio of ethanol: water was 1:1.5, and after electromagnetic stirring for 20 min, solution A was obtained;

[0045] (2) 35mg carboxymethylcellulose and 40mg polyvinyl alcohol were added to solution A at the same time, and the pH value was adjusted to 7.5 to obtain solution B;

[0046] (3) Add 100 mg of graphene oxide solution with a concentration of 4 mg / mL to solution B, ultrasonically disperse for 1 h, and then electromagnetically stir at 30° C. for 24 h to obtain solution C;

[0047] (4) Place solution C in liquid nitrogen and freeze for 30 minutes, then put it into a freeze dryer for freeze-drying treatment for 60 h...

Embodiment 2～ Embodiment 6

[0051] A method for preparing a three-dimensional porous structure silicon / graphene composite negative electrode material described in Examples 2 to 6 differs from Example 1 in that the particle diameters of step (1) nano-silicon are 1nm, 15nm, and 30nm , 50nm, 100nm, 150nm.

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Abstract

The invention discloses a three-dimensional porous structure silicon / graphene composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly dispersing nanometer silicon into a mixed solution of ethyl alcohol and water so as to obtain a solution A; (2) adding carboxymethylcellulose and an organic carbon source into the solution A, obtaining a solution B after uniform mixing, and adjusting pH value until the solution B is alkali; (3) mixing the alkali solution B and an oxidized graphene solution, and after ultrasonic dispersion, stirring uniformly to obtain a solution C; (4) after putting the solution C into liquid nitrogen for freezing, and then carrying out freeze drying treatment to obtain solid D; and (5) putting the solid D into an argon atmosphere, and carrying out warming, sintering and cooling to obtain the three-dimensional porous structure silicon / graphene composite negative electrode material. The volume effect of silicon in the charging and discharging process can be effectively accommodated, the electrical conductivity is good, and the material has excellent charging and discharging cycle performance and rate capability and high first columbic efficiency.

Description

technical field [0001] The invention relates to the technical field of preparation of negative electrode materials for lithium ion batteries, in particular to a three-dimensional porous silicon / graphene composite negative electrode material and a preparation method thereof. Background technique [0002] At present, the negative electrode active materials of commercial lithium-ion batteries use various graphite-like carbon materials, which have a theoretical specific capacity of 372mAh / g, good conductivity, and a layered structure, which is very suitable for lithium ion intercalation and deintercalation. Higher first Coulombic efficiency and better cycle stability. In recent years, with the rapid development of electronic devices such as mobile phones, notebook computers and digital cameras, and electric vehicles. Higher requirements are placed on the capacity, energy density and cycle life of lithium-ion batteries as power sources. Graphite carbon anode materials are diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 彭工厂万琦刘文静李建斌瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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