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Amorphous silicon-carbon composite, preparation method therefor, and lithium secondary battery comprising same

A lithium secondary battery and carbon composite technology, which is applied in the field of amorphous silicon-carbon composites, can solve problems such as low density, high unit cost, and composite rupture, and achieve small volume changes, simple procedures, and excellent conductivity and the effect of lifetime characteristics

Active Publication Date: 2020-07-17
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of composites containing void structures, there is a problem that the composite tends to crack during the rolling process accompanying electrode fabrication, and it is difficult to fabricate electrodes with high loading due to its low density.
[0008] Furthermore, as a method to solve these problems, nanotube-type SiO has been developed x , but there is a problem that the manufacturing process is difficult and commercialization is difficult due to high unit cost

Method used

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  • Amorphous silicon-carbon composite, preparation method therefor, and lithium secondary battery comprising same
  • Amorphous silicon-carbon composite, preparation method therefor, and lithium secondary battery comprising same
  • Amorphous silicon-carbon composite, preparation method therefor, and lithium secondary battery comprising same

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preparation example Construction

[0082] The preparation method of the present invention is a method for preparing the amorphous silicon-carbon composite through a simple pyrolysis method, which has the advantage of simple manufacturing procedures.

[0083] Negative electrode for lithium secondary battery

[0084] The present invention relates to a negative electrode for a lithium secondary battery, which comprises an active material; a conductive material; and a binder, wherein the active material comprises the amorphous silicon-carbon composite of the present invention.

[0085] Specifically, the negative electrode includes a negative electrode active material formed on a negative electrode current collector, and the negative electrode active material is an amorphous silicon-carbon composite prepared according to the present invention.

[0086] The negative electrode current collector may be specifically selected from the group consisting of copper, stainless steel, titanium, silver, palladium, nickel, alloy...

Embodiment 1

[0108] 1-1. Preparation of amorphous silicon-carbon composite

[0109] 10 mL of tetramethylsilane (TMS) was dissolved in 10 mL of toluene, and mixed at room temperature for 10 to 30 minutes to prepare a mixed solution.

[0110] A silicon wafer to be deposited with an amorphous silicon-carbon composite was put into the furnace, and then argon (Ar) gas (purity 99.999%) was passed in at a rate of 500 cc / min, thereby making the inside of the furnace an inert atmosphere. Then, the furnace was heated to a temperature of 750°C at a heating rate of 10°C / min. After the furnace temperature reached 750° C., the temperature was maintained for 10 to 30 minutes to set the temperature inside the furnace to a constant value.

[0111] Then, the mixed solution was injected into the furnace at a rate of 100 cc / min, and argon was blown in to pyrolyze the mixed solution.

[0112] After pyrolysis, the temperature of the furnace was lowered to room temperature, and a pyrolyzed amorphous silicon-ca...

experiment example 1

[0138] Experimental example 1. Crystal structure analysis of the complex

[0139] Measuring the amorphous silicon-carbon composite (Si-C) prepared in Example 1-1, the silicon-carbon composite (Si-graphite) prepared in Comparative Example 1-1, and the silicon prepared in Comparative Example 2-1 - XRD of oxygen-carbon composite (SiOC) ( Figure 8 ).

[0140] The silicon-carbon composite (Si-C) of Example 1-1 exhibited a wide range of peaks at 32 degrees and 60 degrees. Since the silicon of the silicon-carbon composite (Si-graphite) of Comparative Example 1-1 is a non-amorphous crystalline material, six silicon peaks (about 28 degrees, 47 degrees, 56 degrees, 69 degrees, 76 degrees and 88 degrees ) are clearly visible, and graphite peaks appear at about 26 degrees, 35 degrees and 44 degrees. In addition, the silicon-oxygen-carbon composite (SiOC) of Comparative Example 2-1 showed a wide range of peaks at 30 degrees and 42 degrees.

[0141] Therefore, it was confirmed that the...

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Abstract

The present invention relates to an amorphous silicon-carbon composite, a method for preparing an amorphous silicon-carbon composite by using a pyrolysis method, and a lithium secondary battery anodeand a lithium secondary battery, both of which comprise same.

Description

technical field [0001] This application claims priority and benefit to Korean Patent Application No. 10-2018-0029924, filed March 14, 2018, and Korean Patent Application No. 10-2019-0026971, filed March 8, 2019, the entire disclosure of which Incorporated herein in its entirety by reference. [0002] The present invention relates to an amorphous silicon-carbon composite, a manufacturing method thereof, a negative electrode for a lithium secondary battery containing the amorphous silicon-carbon composite, and a lithium secondary battery. Background technique [0003] Lithium secondary batteries (eg, lithium ion batteries), nickel metal hydride batteries, and other secondary batteries are becoming increasingly important as power sources for vehicles or portable remote terminals such as notebook computers. In particular, a lithium secondary battery capable of achieving high energy density and light weight can be used as a high-energy power source for vehicles, so that demand i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/02C01B32/05H01M4/36H01M4/38H01M4/587H01M10/0525
CPCY02E60/10H01M4/587H01M10/0525C01P2004/64C01P2004/62C01P2006/10C01B33/00C01B32/00H01M4/386H01M4/364H01M4/1395H01M4/1393H01M4/0471H01M4/134H01M4/133C01B33/02C01B32/05C01P2002/02C01P2004/80C01P2004/61H01M4/621H01M2004/027H01M2004/028
Inventor 金壮培朴寿真蔡宗铉梁智惠卜泰洙洪东基柳在建俞硕根
Owner LG ENERGY SOLUTION LTD