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Anode active material, anode comprising same, and lithium secondary battery

A negative active material and negative electrode technology, applied in the direction of secondary batteries, active material electrodes, negative electrodes, etc., can solve the problems of low initial efficiency, offset, etc., achieve excellent life characteristics, reduce water content, and improve life characteristics.

Active Publication Date: 2020-07-28
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such low initial efficiency requires excess capacity of the positive electrode in the manufacture of secondary batteries, resulting in offsetting capacity per unit weight of the negative electrode

Method used

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  • Anode active material, anode comprising same, and lithium secondary battery
  • Anode active material, anode comprising same, and lithium secondary battery

Examples

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preparation example Construction

[0061] The method for preparing negative electrode active material according to the embodiment of the present invention comprises the following steps:

[0062] SiO x Reaction of (0<x<2) gas with Mg gas, and cooling the reaction mixture at 400-900° C. to deposit a silicon oxide compound;

[0063] comminuting the deposited silicon oxide composite; and

[0064] Injecting carbonaceous raw material gas into the pulverized silicon oxide composite and performing heat treatment at 850°C to 1150°C for 30 minutes to 8 hours to form carbonaceous raw material on the surface of the silicon oxide composite coating.

[0065] According to one embodiment of the present invention, by making Si and SiO 2 Prepare SiO by evaporating at 1000℃~1800℃ x (0

[0066] SiO x The reaction between (0x (0x The reaction is insufficient to cause a problem that silicate cannot be formed and an undesired phase such as MgO remains. Th...

Embodiment 1

[0087] (1) Preparation of negative electrode active material

[0088] Silicon powder and silicon dioxide (SiO 2 ) powders were uniformly mixed at a molar ratio of 1:1, and the resulting mixture was heat-treated at 1400 °C under a reduced-pressure atmosphere of 1 Torr to prepare SiO x (0<x<2) gas, and Mg is heat-treated at 900° C. to prepare Mg gas.

[0089] so that the resulting SiO x (050 ) is a Mg-containing silicon oxide composite powder of 5 μm.

[0090] The recovered silicon oxide composite powder was heated at a rate of 5 °C / min using a tube electric furnace, and then heated under argon (Ar) and methane (CH 4 ) in the presence of a mixed gas at 950° C. for 2 hours to obtain a negative electrode active material comprising a silicon oxide compound containing Mg having carbon coating. Here, the content of the carbon coating was 5 parts by weight based on 100 parts by weight of the Mg-containing silicon oxide composite.

[0091] The negative electrode active material...

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Abstract

Disclosed is an anode active material, a method for producing same, and an anode comprising same, the anode active material comprising: a silicon oxide composite including i) Si, ii) a silicon oxide represented by SiOx(0<x<=2), and iii) magnesium silicate containing Si and Mg; and a carbon coating layer positioned on the surface of the silicon oxide composite and including a carbon-based material,wherein the anode active material simultaneously displays Mg2SiO4 peaks and MgSiO3 peaks in an X-ray diffraction analysis, has no MgO peaks observed therefrom, has a ratio I(Mg2SiO4) / I(MgSiO3), beinga ratio of the peak intensity I(Mg2SiO4) of Mg2SiO4 to the peak intensity I(MgSiO3) of MgSiO3, of less than 1, and has a moisture content of less than 200 ppm when the moisture content is measured at250 DEG C by the Karl-Fischer method.

Description

technical field [0001] The present invention relates to a negative electrode active material, a negative electrode containing the negative electrode active material, and a lithium secondary battery containing the negative electrode. [0002] This application claims priority from Korean Patent Application No. 10-2018-0012299 filed in Korea on January 31, 2018. Background technique [0003] Recently, with the development and popularization of mobile devices, personal computers, electric motors, and contemporary capacitor devices, there has been an increasing demand for high-capacity energy sources. Typical examples of such energy sources include lithium secondary batteries. Silicon is attracting attention as a negative electrode material for next-generation types of non-aqueous electrolyte secondary batteries because its capacity (about 4200mAh / g) is equivalent to that of graphite-based materials conventionally used as negative electrode materials (theoretical capacity: 372mA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/58H01M4/62H01M4/131H01M10/0525C01B33/02C01B33/113
CPCC01B33/02C01B33/113C01B33/24H01M4/131H01M10/0525Y02E60/10H01M4/366H01M4/364H01M4/134H01M4/1391H01M4/1395H01M4/386H01M4/483H01M4/587H01M4/625H01M4/485H01M4/5825H01M4/62H01M4/0471H01M4/133H01M4/1393H01M2004/027
Inventor 申善英金东赫李龙珠赵来焕金帝映
Owner LG ENERGY SOLUTION LTD