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Negative electrode for secondary battery and manufacturing method of the same

A secondary battery and negative electrode technology, applied in the field of secondary battery negative electrode and its preparation, can solve the problems of reduced electrode density, decreased unit volume capacity, large specific surface area, etc., to achieve improved charging capacity, high electrode density, excellent electrolysis The effect of liquid immersion

Active Publication Date: 2017-02-22
OCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, as mentioned above, when silicon is used as the negative electrode active material, compared with graphite, the electrode density is lower due to the larger specific surface area, so there is a problem that the capacity per unit volume is lowered.

Method used

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  • Negative electrode for secondary battery and manufacturing method of the same
  • Negative electrode for secondary battery and manufacturing method of the same
  • Negative electrode for secondary battery and manufacturing method of the same

Examples

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preparation example Construction

[0101] The present invention can provide a method for preparing a negative electrode for a secondary battery. The method for preparing a negative electrode for a secondary battery includes: step (a), preparing a slurry solution containing Si-block copolymer core-shell particles and a carbonaceous raw material mixed therewith The mixture; Step (b), heat-treating the above-mentioned mixture; Step (c), preparing a carbon-silicon composite by pulverizing the above-mentioned mixture after performing a carbonization process on the heat-treated above-mentioned mixture; Step (d), mixing the above-mentioned carbon-silicon Composite and graphite to prepare negative electrode active material; and step (e), coating above-mentioned negative electrode active material, conductive material, binding material and thickening agent on current collector, the carbonization and pulverization in above-mentioned step (c) are carried out at least repeatedly 2 times, in the particle distribution in the n...

Embodiment 1

[0145] Polyacrylate and polystyrene were synthesized into polyacrylate-polystyrene block copolymers by a reversible addition fragmentation chain transfer method. At this point, the average molecular weight (M n ) is 4090g / mol, the average molecular weight of polystyrene (M n ) is 29370 g / mol. 0.1 g of polyacrylate-polystyrene block copolymer and 8.9 g of N-methyl-2-pyrrolidone dispersion medium were mixed. 1 g of Si particles having an average particle diameter of 50 nm was added to 9 g of the mixed solution. The solution added with Si particles was treated with ultrasonic waves at 20 kHz for 10 minutes and paused for 20 minutes by means of a sonic horn, thereby preparing a mixture containing Si-block copolymer core-shell particles.

[0146] The above mixture and amorphous carbon evaporated at a temperature of 350° C. were mixed and stirred for about 30 minutes, thereby preparing a mixture in which amorphous carbon was dissolved in an N-methyl-2-pyrrolidone dispersion mediu...

Embodiment 2

[0151] A negative electrode active material was prepared by the same method as in Example 1 except that the D50 of spherical graphite was 14 μm.

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Abstract

The present invention relates to a negative electrode for a secondary battery and a method for manufacturing the negative electrode, and more particularly, to a negative electrode for a secondary battery which exhibits excellent charge / discharge characteristics and lifespan characteristics by including a carbon-silicon composite and graphite at a predetermined particle size ratio.

Description

technical field [0001] The present invention relates to a negative electrode for a secondary battery and a method for preparing the same. More specifically, it relates to a negative electrode for a secondary battery that contains a carbon-silicon composite and graphite in a specific particle size ratio, thereby exhibiting excellent charge-discharge characteristics and life characteristics. Background technique [0002] Compared with other secondary batteries, lithium secondary batteries have characteristics such as high energy density, high voltage, and high capacity, and are widely used as power sources for various devices. [0003] In particular, negative electrode active materials capable of expressing high-capacity lithium secondary batteries are required for use in IT equipment and automobile batteries. [0004] Generally, carbon-based materials such as graphite are mainly used as negative electrode active materials of lithium secondary batteries. The theoretical capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/36H01M4/38H01M4/587H01M10/0525H01M4/1393H01M4/1395
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/364H01M4/386H01M4/587H01M10/0525H01M4/625H01M10/052H01M4/366Y02E60/10
Inventor 河正贤金尧燮郑恩惠李浚银
Owner OCI