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Preparation method of silicon/carbon composite material applied to high-performance lithium ion battery anodes

A technology of lithium-ion batteries and carbon composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of silicon nanoparticle graphene sheet stacking, etc., to improve cycle stability, avoid direct contact, increase evenly distributed effect

Active Publication Date: 2016-05-11
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the serious agglomeration of silicon nanoparticles and the stacking of graphene sheets during the preparation process that cannot be solved by traditional physical methods such as ultrasound and electrostatic interaction

Method used

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  • Preparation method of silicon/carbon composite material applied to high-performance lithium ion battery anodes
  • Preparation method of silicon/carbon composite material applied to high-performance lithium ion battery anodes
  • Preparation method of silicon/carbon composite material applied to high-performance lithium ion battery anodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) NaF (0.5molL -1 ) configuration: Weigh 4.2g NaF and dissolve it in 200ml water to obtain.

[0036] 2) NaF-silicon / graphene oxide composite material: Weigh 300 mg of silicon nanoparticles and add them to a mixed solvent of absolute ethanol: water = 1:2 (volume ratio), after ultrasonication for 30 minutes, the ultrasonic power is 900 W, and then dropwise Add the aqueous sol (5mg / L) containing 270mg graphene oxide, finally add the NaF solution of 0.285ml, ultrasonic 60min, ultrasonic power is 300W; Namely obtain the mixed solution of NaF-silicon / graphene oxide composite material.

[0037] 3) Add the mixed solution obtained in step (2) into an ethanol solution of 889 mg of alcohol-soluble phenolic resin (concentration: 5 g / L), place it in a water bath at 50° C., and heat for 24 hours;

[0038] 4) The sample prepared in step (3) was raised to 700° C. at a heating rate of 7 minutes under an argon atmosphere, and kept at a constant temperature for 2 hours; 97 ml of hydrofl...

Embodiment 2

[0041] 1) NaF (0.5molL -1 ) configuration: Weigh 4.2g NaF and dissolve it in 200ml water to obtain.

[0042] 2) Mixed solution of NaF-silicon / graphene oxide composite material: Weigh 400 mg of silicon nanoparticles and add them to a mixed solvent of absolute ethanol / water = 1:1. Add the aqueous sol (2mg / L) containing 50mg graphene oxide, finally add 0.714ml NaF, ultrasonic 60min, ultrasonic power is 300W; The mixed solution of NaF-silicon / graphene oxide composite material can be obtained.

[0043] 3) Add the mixed solution obtained in step (2) into an aqueous solution (concentration: 5 mg / L) containing 200 mg of sucrose, and conduct a hydrothermal reaction at 180° C. for 24 hours.

[0044] 4) The sample prepared in step (3) was raised to 1000° C. at a heating rate of 3 minutes under an argon atmosphere, and the temperature was kept at a constant temperature for 2 hours; 25 ml of the composite material with a mass fraction of 10% hydrofluoric acid was soaked and carbonized, an...

Embodiment 3

[0047] 1) LiF (0.2molL -1 ) configuration: Take 30mL of LiF solution and dilute it to 70ml to obtain the solution with the required concentration.

[0048] 2) Mixed solution of LiF-silicon / graphene oxide composite material: Weigh 220 mg of silicon nanoparticles and add them to a mixed solvent of absolute ethanol / water = 1:1. Aqueous sol (3mg / L) containing 88mg graphene oxide, finally add 2.6ml LiF, ultrasonic 30min, ultrasonic power is 600W; A mixed solution of LiF-silicon / graphene oxide composite material can be obtained.

[0049] 3) Add the mixed solution obtained in step (1) into 1840 mg polyvinyl alcohol aqueous solution (concentration: 3 mg / L), place in a water bath and stir at room temperature for 24 hours;

[0050] 4) Raise the sample prepared in step (2) to 850°C with a heating rate of 3 minutes under an argon atmosphere, and keep the temperature at a constant temperature for 2 hours; measure 133ml of the composite material with a mass fraction of 30% hydrofluoric aci...

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Abstract

The invention discloses a preparation method of a silicon / carbon composite material applied to high-performance lithium ion battery anodes. The preparation method comprises the following steps: adding silicon nanoparticles into a mixed solvent, carrying out ultrasonic treatment, dropwise adding hydrosol containing graphene oxide, finally adding a fluoride solution, then carrying out ultrasonic treatment, then adding the materials into a pyrolytic carbon source solution for reacting, carrying out carbonization and acid treatment under the inert atmosphere and washing till the solution is neutral to obtain the silicon / carbon composite material applied to high-performance lithium ion battery anodes. The silicon / carbon composite material prepared by the method has the advantages of high capacity and long cycle life.

Description

technical field [0001] The invention relates to a method for preparing a silicon / carbon composite material used for a negative electrode of a high-performance lithium ion battery. Background technique [0002] With the rapid development of portable power supply, electric vehicles and other fields, higher requirements are put forward for the research and development of lithium-ion battery anode materials with high energy density, long cycle life and excellent rate characteristics. The current commercialized lithium-ion batteries with graphite anodes have less active sites and greater resistance to lithium ion transport, so the capacity is low, which has been difficult to meet the needs of modern society. Therefore, it is particularly important to develop new anode materials. [0003] Since the advent of graphene in 2004, graphene and its derivatives have received extensive attention from researchers. Graphene oxide (GO) has abundant defect sites and ideal sheet structure, w...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/1393H01M4/1395H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 宋燕李肖
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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