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Silicon/silicic oxide/carbon composite material as well as preparation method and application thereof

A composite material and graphitized carbon technology, applied in electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of low initial Coulombic efficiency, poor cycle stability, and complicated process of high-capacity negative electrode materials, and achieve excellent cycle Effects of stability, improved conductivity, and excellent Coulombic efficiency

Active Publication Date: 2016-07-20
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to provide a silicon / silicon oxide / carbon (Si / SiO x / C) Composite material preparation method, and apply it to high energy density lithium ion battery negative electrode material, Si / SiO x / C composite material combines the high capacity of Si-based anode materials, SiO x Based on the advantages of stable cycle of negative electrode materials and good conductivity of carbon materials, it overcomes the defects of low coulombic efficiency and poor cycle stability of high-capacity negative electrode materials for the first time; at the same time, it solves the defects of complex process and high cost in the processing of nanomaterials, and develops a production process Simple, commercially viable process route for large-scale production

Method used

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  • Silicon/silicic oxide/carbon composite material as well as preparation method and application thereof
  • Silicon/silicic oxide/carbon composite material as well as preparation method and application thereof
  • Silicon/silicic oxide/carbon composite material as well as preparation method and application thereof

Examples

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Embodiment 1

[0030] 1 kg of silicon powder with an average particle size of 5 μm and 1 kg of SiO with an average particle size of 1 μm x , 1kg polyvinylpyrrolidone, 500g glucose, 25g sodium alginate and 45L water were added into the ball mill for ball milling for 6 hours, the ball mill speed was 600r / min, then 200g graphene and 300gSuperP were added for 1 hour, the ball mill speed was 600r / min, The slurry is transferred to the storage tank of the sand mill, and the sand mill speed is 1000r / min. After grinding for 12 hours, the slurry is transferred to the stirring mill, and 6.6kg of flake graphite with an average particle size of 5 μm is added thereto. , stirred for 8 hours, and the rotating speed of the stirring mill was 400r / min; after the slurry was dried and formed by an open spray dryer, it was sintered in a nitrogen atmosphere in a rotary kiln, the sintering temperature was 800 ° C, and the heating rate was 5 ° C / min, after sintering for 2 hours, lower the temperature to 700°C, pas...

Embodiment 1-1

[0034] Other conditions are the same as in Example 1, except that sodium alginate is replaced by chitosan, graphitized carbon accounts for 67% of the entire composite material, and amorphous carbon accounts for 13%; nitrogen adsorption and desorption tests obtain Si / SiO x The specific surface area of ​​ / C composite is 17.5m 2 / g.

Embodiment 1-2

[0036] Other conditions are the same as in Example 1, except that sodium alginate is not added, graphitized carbon accounts for 69% of the entire composite material, and amorphous carbon accounts for 11%; nitrogen adsorption and desorption tests obtain Si / SiO x The specific surface area of ​​ / C composite is 17.0m 2 / g.

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Abstract

The invention provides a preparation method and application of a Si / SiOx / C composite material. By using the Si / SiOx / C composite material, the advantages that a Si-based negative electrode material is high in capacity, a SiOx-based negative electrode material is stable in circulation and a carbon material is good in electric conductivity are combined; the defects that a high-capacity negative electrode material is low in first coulombic efficiency and poor in cyclical stability are overcome; a Si / SiOx / C negative electrode material shows excellent electrochemical properties; meanwhile, the defects that a technique is complicated and the cost is high in the processing procedure of a nano-material are overcome; a technical route which is simple in production technique and available for commercialized large-scale production is researched and developed; the Si / SiOx / C composite material has a wide application prospect in the field of high-energy-density lithium ion batteries.

Description

technical field [0001] The invention relates to a method for preparing a silicon / silicon oxide / carbon composite material, in particular to the application of the silicon / silicon oxide / carbon composite material as a high specific capacity lithium ion battery negative electrode material. Background technique: [0002] Lithium-ion batteries have outstanding advantages such as high specific energy, long service life, green and pollution-free, and have been widely used in electric vehicles and portable electronic devices. With the continuous expansion of application fields, the demand for battery energy density is getting higher and higher. At present, the theoretical capacity of commercial lithium-ion battery carbon-based negative electrode materials is only 372mAh / g, which can no longer meet the needs of high-energy-density lithium-ion batteries. The improvement of battery energy density mainly depends on the improvement of the specific capacity of electrode materials. The anod...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/483H01M4/583H01M10/0525H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 郭玉国徐泉李金熠殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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