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Anode for lithium secondary battery, lithium secondary battery comprising same, and manufacturing method therefor

A technology for lithium secondary batteries and negative electrodes, applied in the field of negative electrodes for lithium secondary batteries, lithium secondary batteries containing the same, and the preparation of the negative electrodes, capable of solving problems such as small capacity and achieving the effect of high capacity characteristics

Inactive Publication Date: 2019-08-23
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for carbon-based materials, there is a disadvantage in that its theoretical capacity is only about 400mAh / g, so its capacity is small, and therefore, various researches have been conducted to achieve a high theoretical capacity (4,200mAh / g) by using silicon (Si) To replace carbon-based materials as negative electrode active materials

Method used

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  • Anode for lithium secondary battery, lithium secondary battery comprising same, and manufacturing method therefor
  • Anode for lithium secondary battery, lithium secondary battery comprising same, and manufacturing method therefor

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preparation example Construction

[0044] The method for preparing the negative electrode of the lithium secondary battery of the present invention comprises the following steps: (1) forming a negative electrode active material layer on the negative electrode current collector; and (2) forming a negative electrode active material layer containing lithium metal and metal oxide coating.

[0045] In step (1), as in a conventional method, an anode active material layer containing a carbon-based active material is formed on the anode current collector. For example, the negative electrode can be prepared according to a method of forming a negative electrode active material layer on a negative electrode current collector in which a slurry is prepared by mixing and stirring the negative electrode active material with a solvent and, if necessary, a binder and a conductive agent. After that, a negative electrode current collector was coated with the slurry, compressed, and then dried.

[0046] The negative active materi...

Embodiment 1

[0080]

[0081] By adding 92% by weight of SiO as the negative electrode active material, 3% by weight of Denka black (Denka black, conductive agent), 3.5% by weight of SBR (binder) and 1.5% by weight of CMC (thickener) into water to prepare negative electrode mixture slurry. After coating one surface of a copper current collector with the prepared negative electrode mixture slurry, drying and rolling, the coated copper current collector was punched into a predetermined size to prepare a negative electrode on which a negative electrode active material layer was formed.

[0082] A coating was formed on the negative electrode prepared above by physical vapor deposition. For this deposition, 90 parts by weight of lithium metal and 10 parts by weight of Al 2 o 3 As a raw material, it was placed in a thermal evaporator (Sunic System Company), and deposited on the SiO electrode with a thickness of 5 μm by thermal evaporation containing lithium metal and Al 2 o 3 coating.

[0...

Embodiment 2

[0086]

[0087] The negative electrode and the coin-type half cell were prepared in the same manner as in Example 1, except that lithium metal and Al were used in the preparation of the negative electrode in Example 1 in amounts of 95 parts by weight and 5 parts by weight, respectively. 2 o 3 .

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Abstract

The present invention relates to: an anode for a lithium secondary battery, comprising an anode active material layer, which is formed on an anode current collector, and a coating layer, which is formed on the anode active material layer and includes lithium metal and metal oxides; a lithium secondary battery comprising the same; and a manufacturing method therefor.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0050643 filed with the Korean Intellectual Property Office on April 19, 2017, the disclosure of which is incorporated herein by reference in its entirety. [0003] [technical field] [0004] The present invention relates to a negative electrode for a lithium secondary battery, a lithium secondary battery comprising the same, and a method for preparing the negative electrode, more particularly, to: a negative electrode for a lithium secondary battery, which contains a coating of lithium metal and metal oxide Formed on a negative electrode active material layer; a lithium secondary battery including the negative electrode; and a method of preparing the negative electrode. Background technique [0005] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/131H01M4/1395H01M4/1391H01M4/04H01M10/0525
CPCH01M4/134H01M4/1395H01M10/0525H01M4/366H01M4/0423H01M4/0428H01M4/38Y02E60/10H01M4/131H01M4/1391H01M4/0402Y02P70/50H01M2004/027
Inventor 蔡午秉姜允雅宋俊赫金银卿禹相昱
Owner LG ENERGY SOLUTION LTD
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