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Silicon slurries and carbon-silicon composites for anode active materials

An anode active, silicon paste technology, applied in nanotechnology for materials and surface science, electrode manufacturing, battery electrodes, etc., can solve problems such as obstruction, rapid deterioration of lithium secondary battery life, etc., to improve capacity and life. Effect

Active Publication Date: 2017-04-26
OCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because, due to the possible electrical insulation caused by the empty space generated between the inorganic particles and the anode active material during repeated charging, the lifespan of lithium secondary batteries suffers from rapid deterioration, so the application of inorganic particles to lithium secondary batteries The secondary battery has serious hindrance

Method used

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  • Silicon slurries and carbon-silicon composites for anode active materials
  • Silicon slurries and carbon-silicon composites for anode active materials
  • Silicon slurries and carbon-silicon composites for anode active materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A slurry containing 10 wt% silicon was prepared by mixing silicon powder with an average particle size of 50 nm with NMP, followed by ultrasonic treatment at 20 kHz and 500 W for 30 minutes in a continuous cycle, thereby preparing a slurry satisfying 1≤D90 / D50≤ 2.5, and 2nm<D50<180nm dispersion conditions of silicon slurry.

Embodiment 2

[0079] A slurry comprising 10 wt% of silicon was prepared by mixing silicon powder with an average particle diameter of 50 nm with NMP; and based on 100 parts by weight of silicon powder, 10 parts by weight of polyacrylic acid-polystyrene block copolymer was used as an additive added to the slurry. The prepared slurry was subjected to ultrasonic treatment at 20 kHz and 500 W for 30 minutes in a continuous circulation mode, thereby preparing a silicon slurry satisfying the dispersion conditions of 1≦D90 / D50≦2.5, and 2nm<D50<180nm.

Embodiment 3

[0081] Except using polyacrylic acid-polyacrylonitrile block copolymer instead of polyacrylic acid-polystyrene block copolymer as an additive, in the same manner as in Example 2, a compound satisfying 1≤D90 / D50≤2.5 was prepared, and Silicon slurry with dispersion conditions of 2nm<D50<180nm.

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Abstract

The invention provides a silicon slurry for an anode active material of a secondary battery, which includes silicon particles and a dispersion medium, wherein, when D90 is used to represent the silicon particle diameter of 90% of the cumulative particle size distribution and D50 is used to represent When the cumulative particle size distribution is 50% of the silicon particle size, the silicon slurry satisfies 1≤D90 / D50≤2.5 and 2nm

Description

technical field [0001] The present invention relates to a silicon slurry and a carbon-silicon compound for anode active materials. Background technique [0002] Batteries IT equipment and automobiles require anode materials capable of realizing lithium secondary batteries with high capacity. Under such circumstances, silicon is attracting attention as an anode material for high-capacity lithium secondary batteries. For example, pure silicon is known to have a high theoretical capacity of 4200 mAh / g. [0003] However, it is difficult to commercialize silicon because its cycle characteristics deteriorate compared with carbon-based materials. This is because, when inorganic particles such as silicon are used as an anode active material for lithium intercalation or deintercalation, the conductivity between the active materials deteriorates due to the volume change of the anode active material during charge and discharge of a lithium secondary battery. Or the anode active mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/36B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/62H01M4/622H01M4/0404H01M4/0471H01M4/13H01M4/364H01M4/587Y02E60/10H01M4/38
Inventor 金尧燮郑恩惠郑圣虎金亨洛
Owner OCI