Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier

A silicon-carbon composite material and artificial graphite technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electrical conductivity, poor cycle stability, and large irreversible capacity loss, and achieve high production efficiency, high specific capacity, The effect of improving the first-time efficiency

Active Publication Date: 2013-10-09
中国有色桂林矿产地质研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of the above-mentioned prior art, the primary purpose of the present invention is to provide a silicon-carbon composite negative electrode material for lithium batteries with artificial graphite as the carrier. The silicon-carbon composite negative electrode material for lithium batteries has a specific capacity of more than 800mAh / g for the first time. The first charge and discharge efficiency is high, the specific capacity is high, and the cycle performance is good, which solves the problems of large irreversible capacity loss, poor conductivity, and poor cycle stability of existing silicon-based materials in the actual application of lithium battery negative electrodes.

Method used

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  • Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier
  • Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier
  • Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier

Examples

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Effect test

Embodiment 1

[0056] (1) Preparation of silicon-carbon composite anode materials for lithium batteries with artificial graphite as the carrier:

[0057] (1) Dissolve 8.57g of nano-silicon (particle size 50-200nm) in 100mL of absolute ethanol, add 0.1g of polyvinyl alcohol, and sonicate in an ultrasonic cleaner for 1 hour to obtain a mixed solution A; the mass of the mixed solution A The solid content is 10%;

[0058] (2) Dissolve 14.25g of glucose completely in deionized water and stir for 1 hour to obtain mixed solution B;

[0059] (3) Disperse 40g of artificial graphite in 400mL of absolute ethanol and stir for 0.5h to obtain a mixed solution C;

[0060] (4) Slowly add the mixed solution A of step (1) and the mixed solution B of step (2) to the mixed solution C of step (3) at the same time, add absolute ethanol to make the solid content of the entire dispersion system 30%, and Stir quickly (1000r / min) for 1 hour to obtain a mixed solution D; then dry the mixed solution D through a spray...

Embodiment 2

[0067] (1) Preparation of silicon-carbon composite anode materials for lithium batteries with artificial graphite as the carrier:

[0068] (1) Disperse 8.57g of nano-silicon (50-200nm in particle size) in 100mL of absolute ethanol, add 0.2g of polyethyleneimine, and sonicate in an ultrasonic cleaner for 2 hours to obtain mixed solution A; The mass solid content is 10%;

[0069] (2) Dissolve 35.7g of citric acid into 300mL of absolute ethanol and stir for 0.5h to obtain mixed solution B;

[0070] (3) Disperse 40g of artificial graphite in 400mL of absolute ethanol and stir for 2 hours to obtain a mixed solution C;

[0071] (4) Slowly add the mixed solution A of step (1) and the mixed solution B of step (2) into the mixed solution C of step (3), add absolute ethanol so that the solid content of the entire dispersion system is 15%, and quickly (800r / min) stirring for 3 hours to obtain the mixed solution D; then the mixed solution D was dried by a spray dryer under certain condi...

Embodiment 3

[0083] (1) Preparation of silicon-carbon composite anode materials for lithium batteries with artificial graphite as the carrier:

[0084] (1) Dissolve 8.57g of nano-silicon (particle size 50-200nm) in 100mL of absolute ethanol, add 0.4g of nitrogen-methylpyrrolidone, and sonicate in an ultrasonic cleaner for 1.5h to obtain mixed solution A; mixed solution A The mass solid content is 10%;

[0085] (2) Dissolve 4.75g of phenolic resin into 100mL of absolute ethanol, and stir for 2 hours to obtain mixed solution B;

[0086] (3) Dissolve 40g of artificial graphite in 300mL of absolute ethanol, and stir for 1 hour to obtain a mixed solution C;

[0087] (4) Slowly add the mixed solution A of step (1) and the mixed solution B of step (2) to the mixed solution C of step (3) at the same time, add absolute ethanol to make the solid content of the entire dispersion system 10%, and Stir quickly (1200r / min) for 5 hours to obtain the mixed solution D; then dry the mixed solution D through ...

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Abstract

The invention provides preparation and application of a lithium battery silicon-carbon composite material taking synthetic graphite as a carrier. The preparation method comprises the following steps of: dissolving nanometer silicon and synthetic graphite in a dispersant to obtain a uniform dispersion liquid, adding an organic carbon source, stirring uniformly to obtain a mixed liquid, feeding the mixed liquid into a closed circulation spray dryer to prepare composite precursor powder, pre-sintering for 3-10 hours at the temperature of 300-700 DEG C to obtain a silicon-carbon composite material subjected to primary carbon cladding; and further dissolving the silicon-carbon composite material subjected to primary carbon cladding with the organic carbon source in a dispersant, stirring to obtain a uniform mixed liquid, feeding the uniform mixed liquid into a second closed circulation spray dryer to prepare composite powder, and heating the powder for 6-18 hours at the temperature of 700-1000 DEG C, so as to obtain the lithium battery silicon-carbon composite material taking synthetic graphite as a carrier. The lithium battery silicon-carbon composite material prepared by the invention shows such excellent electrochemical properties as high first charge-discharge efficiency, high specific capacity and good cycle performance after being applied to a lithium battery.

Description

technical field [0001] The invention relates to the field of lithium battery electrode material preparation, in particular to the preparation and application of a lithium battery silicon-carbon composite negative electrode material with artificial graphite as a carrier. Background technique [0002] Compared with other secondary batteries, lithium batteries have the advantages of high voltage, high energy density, long cycle life, and environmental friendliness. At present, they have been widely used in portable electronic products and electric tools, and are expected to become the future of hybrid vehicles and pure electric vehicles. One of the main energy supplies for power vehicles. Anode materials are one of the key factors to evaluate the overall performance of lithium batteries. [0003] At present, the commercially used graphite anode materials for lithium batteries have a low theoretical capacity (generally 372mAh / g), and there is little room for further improvement...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/1393H01M4/1395
CPCY02E60/10
Inventor 侯贤华李敏王洁胡社军
Owner 中国有色桂林矿产地质研究院有限公司
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