Anode active material for lithium secondary battery and method for preparing same

An anode active and secondary battery technology, applied in the field of anode active materials and their preparation, can solve the problems of blowing out dust, etc., achieve the effects of improving electrical conductivity, improving charging and discharging stability, and avoiding the problem of blowing out dust

Inactive Publication Date: 2016-01-27
OCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, a further problem is that dispersion between the silicon anode active material and the conductive material, and blown-out dust of the conductive material itself may occur.

Method used

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  • Anode active material for lithium secondary battery and method for preparing same
  • Anode active material for lithium secondary battery and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0102] Preparation of anode active materials for secondary batteries

[0103] Synthesis of polyacrylic acid-polyacrylonitrile block copolymers via reversible addition-fragmentation chain transfer using polyacrylic acid and polyacrylonitrile. In this case, polyacrylic acid has a number average molecular weight (Mn) of 4090 g / mol, and polyacrylonitrile has a number average molecular weight (Mn) of 29370 g / mol. 0.25 g of polyacrylic acid-polyacrylonitrile block copolymer was mixed into 44.75 g of said first dispersion medium, N-methyl-2-pyrrolidone (NMP). Into the mixed solution, 5 g of silicon particles having an average particle size of 50 nm were dispersed to prepare a slurry. In this case, the distribution characteristics of silicon were determined by dynamic light scattering (instrument: ELS-Z2, Otsuka Electronics, Japan), and the result showed D50 = 120 nm.

[0104] 120 g of the first carbon source pitch (QI: 4 wt %, SP: 30° C.) was mixed and dispersed in 34 g of the sl...

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Abstract

The invention relates to an anode active material for a lithium secondary battery, which comprises a core layer comprising a carbon-silicon composite, and a shell layer comprising a conductive material and a carbonaceous material for fixing the conductive material, uniformly coated on a surface of the core layer; and the preparation method thereof.

Description

technical field [0001] The invention relates to an anode active material for a lithium secondary battery and a preparation method thereof. Background technique [0002] The use of an anode material of a lithium secondary battery capable of achieving high capacity and output is required for batteries for information technology (IT) equipment or batteries for automobiles. Therefore, silicon has attracted attention as an anode material of a lithium secondary battery having a high capacity. For example, pure silicon is known to have a high theoretical capacity of 4200 mAh / g. [0003] However, silicon has deteriorated cycle performance as compared with carbon-based materials, which is still an obstacle to practical use. The reason is because when inorganic particles such as silicon as an anode active material are directly used as an absorbing and releasing material for lithium, the conductivity between the active materials deteriorates due to volume change during charge and dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/38H01M4/133H01M4/134H01M10/0525
CPCH01M4/133H01M4/134H01M4/386H01M4/583H01M10/0525H01M2220/30H01M2220/20H01M4/364H01M4/622H01M4/366H01M4/625H01M4/626H01M4/624H01M10/052Y02E60/10H01M4/139H01M4/38H01M4/44H01M4/587H01M4/62Y02T10/70
Inventor 郑恩惠金尧燮郑圣虎河正贤
Owner OCI
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