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Porous silicon-based particles, preparation method thereof, and negative electrode active material containing same

A negative electrode active material and porosity technology, which is applied in the field of porous silicon-based particles and their preparation, as well as the negative electrode active material containing the same, can solve the problem of damage to the conductive network, increased surface area side reactions, and uniform nano-silicon negative electrode active material. Difficulty in distribution, etc., to achieve the effect of reducing volume expansion and easy dispersion

Active Publication Date: 2017-12-01
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a phenomenon that the contact resistance between particles increases due to the damage of the conductive network in the electrode, resulting in a decrease in battery performance
[0006] Therefore, try to reduce the size of silicon particles to nanometer size, thereby reducing the method of substantial diameter change caused by volume change, but the uniform nano-silicon negative electrode active material is in the synthetic method and makes the nano-silicon negative electrode active material in the slurry There are difficulties in uniform distribution, and there are problems such as increased side reactions with the electrolyte due to the maximized surface area

Method used

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  • Porous silicon-based particles, preparation method thereof, and negative electrode active material containing same
  • Porous silicon-based particles, preparation method thereof, and negative electrode active material containing same
  • Porous silicon-based particles, preparation method thereof, and negative electrode active material containing same

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preparation example Construction

[0055] The method for preparing porous silicon-based particles according to an embodiment of the present invention may include: step (i), using an etching solution to remove the Si or SiO x (0<x<2) an oxide film layer on the surface of the particle; and

[0056] Step (ii), in containing Si or SiO that has removed above-mentioned oxide film layer x (0x (0<x<2) Non-linear pores are formed on the particles.

[0057] First, the above step (i) may be to use an etching solution to remove the Si or SiO x (0<x<2) the step of forming an oxide film layer on the surface of the particle.

[0058] That is, the above step (i) is to remove the Si or SiO x (0x (0<x<2) The electroless metal deposition (electroless metal deposition) of the metal catalyst is carried out more smoothly on the particles, and the surface treatment process is carried out to make the coating more uniform.

[0059] Specifically, Si or SiO can be x (0x (02 ).

[0060] According to an embodiment of the present inve...

Embodiment 1

[0113] x (0

[0114] After immersing powdered silicon in 8.5M hydrogen fluoride heated to 50°C, it was stirred for about 30 minutes. This process removes the natural oxide film (SiO 2 ), the above-mentioned natural oxide film layer exists on the surface of the silicon in the powder state, so that the surface treatment is carried out so that the electroless metal deposition (Electrolessmetals deposition) of the metal catalyst is carried out more smoothly on the silicon surface, and the coating is more uniform, thereby The silicon particles with the oxide film removed were obtained.

[0115] x (0x (0

[0116] To the removal of the oxide film layer (SiO 2 ) silicon, and mixed with an aqueous solution of 8.5M hydrogen fluoride into 15mM copper sulfate (CuSO 4 ) aqueous solution, the above-mentioned copper sulfate (CuSO 4 ) aqueous solution having the same volume as that of hydrogen fluoride was stirred for about 3 hours, whereby etching was performed. Through this process, a...

Embodiment 2 to Embodiment 6

[0120] Removed the oxide film layer (SiO 2 ) silicon, and mixed with an aqueous solution of 8.5M hydrogen fluoride into 15mM copper sulfate (CuSO 4 ) aqueous solution, the above-mentioned copper sulfate (CuSO 4 ) aqueous solution with the same volume as hydrogen fluoride, and stirred for about 6 hours, 9 hours, 12 hours, 18 hours and 24 hours respectively. Except for this, porous silicon particles were produced in the same manner as in Example 1 above.

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Abstract

The present invention provides a porous silicon-based particle and a preparation method thereof. The porous silicon-based particle includes Si or SiOx (0<x<2) particles, and the particle includes a plurality of nonlinear pores. form on the particle surface. The porous silicon-based particles of an embodiment of the present invention form a plurality of non-linear pores in Si or SiOx (0<x<2) particles, thereby making it easier to disperse in the negative electrode active material slurry, and can generate a positive reaction with the electrolyte. The side reactions are minimized, and the volume expansion can be reduced during charging and discharging. Furthermore, according to an embodiment of the present invention, the shape, shape and size of pores formed in the porous silicon particles can be controlled by adjusting the type of metal catalyst, the concentration of the metal catalyst, and the etching time.

Description

technical field [0001] The present invention relates to porous silicon-based particles, a preparation method thereof, and a negative electrode active material containing the same. Background technique [0002] Recently, with the development of the information and communication industry, electronic equipment has gradually become smaller, lighter, thinner, and more portable. As the power supply of these electronic equipment, batteries have higher and higher requirements for high energy density. Lithium secondary batteries are batteries that can best meet such requirements, and research on lithium secondary batteries is currently very active. [0003] Carbon-based materials in various forms including artificial graphite, natural graphite, or hard carbon that can intercalate and deintercalate lithium are used as negative electrode active materials for lithium secondary batteries. Among the above-mentioned carbons, graphite has advantages in energy density of lithium batteries, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113C01B33/02H01M4/38H01M4/48H01M10/052
CPCY02E60/10H01M4/36H01M4/366H01M4/38H01M10/052C01B33/02C01B33/113C01B33/18
Inventor 柳正宇李美林李龙珠金银卿李汉浩尹智铉方柄漫李昶来郑镒教李美庆
Owner LG ENERGY SOLUTION LTD