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Omposition for preparing silicon-carbon composite, silicon-carbon composite, electrode for secondary battery comprising same, and method for producing silicon-carbon composite

A technology of carbon composite materials and compositions, applied in electrode manufacturing, electrode heat treatment, electrical components, etc., can solve problems such as reducing service life and volume change, and achieve the effect of improving compatibility

Inactive Publication Date: 2016-12-21
OCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] By repeating this charge and discharge cycle, void spaces may appear between the inorganic particles and the negative electrode active material, resulting in electrical insulation, and in turn rapidly reducing the lifetime, which thus poses a serious problem for use in secondary batteries
[0011] In addition, the problem due to the volume change mentioned above may be more serious when silicon is not sufficiently dispersed in the negative active material or exists only on the surface of the negative active material.

Method used

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  • Omposition for preparing silicon-carbon composite, silicon-carbon composite, electrode for secondary battery comprising same, and method for producing silicon-carbon composite
  • Omposition for preparing silicon-carbon composite, silicon-carbon composite, electrode for secondary battery comprising same, and method for producing silicon-carbon composite
  • Omposition for preparing silicon-carbon composite, silicon-carbon composite, electrode for secondary battery comprising same, and method for producing silicon-carbon composite

Examples

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Effect test

Embodiment 1

[0133] Preparation of Nano-Si Particle Slurry

[0134] To 27 g of tetrahydrofuran, polyethylene-co-polyacrylic acid was added and dissolved, then 3 g of Si nanoparticles were added and dispersed by a continuous circulation process using sonication to form a nano-Si particle slurry.

[0135] At this time, the measurement results of the Si distribution characteristics of the Si paste by the dynamic light scattering method (instrument: ELS-Z2, Otsuka Electronics Co., Ltd.) showed that D50 = 120 nm.

[0136] Preparation of Combination Mixture

[0137] In the 30g nano-Si particle slurry, add 3g carbon black and vortex stirring, then add acrylic acid 2g, polyethylene glycol methacrylate 2g, 1,1'-azobis(cyclohexanenitrile) 0.5g and in about Stir at a temperature of 70°C for about 12 hours. After stirring, the resulting mixture was dried to remove the solvent and milled with a jet mill to form a combined mixture with Si particles and carbon black uniformly dispersed in the polymer...

Embodiment 2

[0147] In the same manner as in Example 1, an electrode for a secondary battery and a secondary battery were prepared, except that spherical graphite was added to the carbon carrier formed in Example 1 during the manufacture of the electrode for a secondary battery. In the powder composed of silicon-carbon composite material, and add composite material powder and spherical graphite in a weight ratio of 1:3 to the electrode.

Embodiment 3

[0149] An electrode for a secondary battery and a secondary battery were prepared in the same manner as in Example 1 except that there was no carbon support during the fabrication of the electrode for a secondary battery.

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Abstract

The present disclosure relates to a composition for preparing a silicon-carbon composite having nano-Si particulates and electrically conductive materials dispersed in an amorphous carbon, the silicon-carbon composite prepared therefrom, an electrode for secondary battery comprising the silicon-carbon composite, and a method for producing the silicon-carbon composite.

Description

technical field [0001] The present invention relates to a composition for preparing a silicon-carbon composite material having nano-Si particles dispersed in amorphous carbon and a conductive material, a silicon-carbon composite material prepared therefrom, an application comprising the silicon-carbon composite material An electrode for a secondary battery and a method for preparing the silicon-carbon composite material. Background technique [0002] Lithium secondary batteries are widely used as power sources of various devices due to high energy density, high voltage, and high capacity performance compared with other secondary batteries. [0003] In particular, the use of negative electrode active materials for lithium secondary batteries and negative electrode materials containing the negative electrode active materials, both of which can achieve high capacity, is required in IT device and vehicle battery applications. [0004] In general, carbonaceous materials such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/052
CPCH01M4/364H01M4/0471H01M4/134H01M4/1395H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 金尧燮郑圣虎郑恩惠河正贤
Owner OCI