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Anode active material and manufacturing method therefor

A negative electrode active material, negative electrode technology, applied in the field of negative electrode active material and its preparation, can solve problems such as reducing efficiency, and achieve the effect of excellent electrical conductivity

Pending Publication Date: 2021-11-09
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the case of additionally using a conductive material, there is a problem that when the content of the conductive material increases, aggregation occurs between the conductive materials; in the case of using carbon nanotubes, when silicon is used together with carbon-based materials When using the negative active material, the problem is that the carbon nanotubes are not only present on the silicon, but are also uniformly distributed throughout the electrode, reducing the efficiency

Method used

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  • Anode active material and manufacturing method therefor
  • Anode active material and manufacturing method therefor
  • Anode active material and manufacturing method therefor

Examples

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preparation example Construction

[0069]In the method for preparing an anode active material according to the present invention, the preparing a mixture including the transition metal compound and the carbon source may include dispersing or dissolving the transition metal compound in the carbon source (ie, an alcohol-based solvent).

[0070] The content of the transition compound may be 0.01% to 10% by weight, specifically 0.05% to 5% by weight, more specifically 0.1% to 3% by weight, based on the entire mixture. When the content of the transition metal compound is within the above range, the carbon coating can be made to satisfy the above content and thickness, and the carbon nanotubes can be made to satisfy the above content and thickness, so that the carbon coating can more effectively reduce the amount of silicon species The volume of the particles varies, and the carbon nanotubes can provide a sufficient electrical contact path while properly maintaining the conductivity of the negative electrode, whereby ...

Embodiment approach

[0099] According to another exemplary embodiment of the present invention, there are provided: a battery module including the secondary battery as a unit cell; and a battery pack including the battery module. Since the battery module and the battery pack include the secondary battery having high capacity, high rate performance, and cycle characteristics, the battery module and the battery pack can be used as a power source for medium to large-scale devices selected from the group consisting of: electric vehicles, hybrids electric vehicles, plug-in hybrid electric vehicles; and power storage systems.

Embodiment 1

[0103] The Si and SiO 2 The powders mixed in a molar ratio of 1:1 were heated under vacuum at 1400°C to form SiO vapor. In addition, Mg was vacuum heated at 700°C to form Mg vapor.

[0104] SiO vapor and Mg vapor were mixed in a weight ratio of 95:5 and reacted with each other in a cooling zone at 500 °C to prepare solid-phase condensed Mg-SiO, which was then ground using a ball mill to prepare a 5 μm size Powder (silicon-based particles).

[0105] will correspond to the η of the metallocene catalyst 5 -(C 5 H 5 ) 2 Fe was mixed with ethanol and used a mist generator (17Mhz, and 30W conditions) to make 1 wt% η 5 -(C 5 H 5 ) 2 Fe fog.

[0106] While maintaining an inert gas atmosphere by flowing Ar gas, Mg—SiO powder was placed in the hot zone of the CVD apparatus, and the mist was blown into the hot zone at 1000° C. using Ar as a carrier gas. The reaction was performed for 30 seconds, thereby preparing a negative electrode active material in which a carbon coating l...

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Abstract

The present invention relates to an anode active material comprising: silicon-based particles; a carbon coating layer which is formed on the surface of the silicon-based particles and which comprises transition metals; and carbon nanotubes (CNTs), wherein one end of each of the CNTs is connected with the transition metals, and the amount of transition metals is 0.03-30 parts by weight on the basis of 100 parts by weight of the sum of the amount of the carbon coating layer and the CNTs.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application is based on and claims priority to Korean Patent Application No. 10-2018-0139256 filed in the Korean Intellectual Property Office on Nov. 13, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a negative electrode active material and a preparation method thereof, more particularly, to a negative electrode active material with carbon coating and carbon nanotubes (CNTs) located on the surface of silicon-based particles and a preparation method thereof. Background technique [0004] Due to the rapid increase in the use of fossil fuels, the need to use alternative or clean energy sources has increased. As part of this, the most active research area is the field of electricity generation and storage using electrochemical reactions. [0005] Currently, a secondary battery is a representative example ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/587H01M4/62H01M10/052C23C16/18C23C16/26C23C16/448
CPCC23C16/18C23C16/26Y02E60/10H01M4/625H01M4/366H01M4/386H01M4/483H01M2004/027H01M10/0525H01M4/0428H01M4/131H01M4/134C23C16/4417H01M4/587H01M4/621H01M10/052C23C16/4486H01M4/1393H01M4/5825
Inventor 金东赫吴一根李龙珠朴世美
Owner LG ENERGY SOLUTION LTD
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