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Method for manufacturing secondary battery anode

A technology for secondary batteries and negative electrodes, applied in battery electrodes, negative electrodes, electrode manufacturing, etc., can solve the problems of reduced cycle characteristics, damaged structure of negative electrode active materials, and volume expansion of negative electrodes, to prevent adhesion reduction and capacity. loss, the effect of increasing capacity loss

Pending Publication Date: 2021-10-29
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the anode is lithiated, excessive intercalation of lithium may lead to damage and structural collapse of the anode active material, or may cause problems such as volume expansion and structural deformation of the anode, thereby reducing the gap between the current collector and the anode active material layer. Adhesion between the
In this case, the negative electrode has a problem that the purpose of pre-lithiation cannot be sufficiently achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Example 1: Manufacture of Negative Electrodes for Secondary Batteries

[0092] 1. Preparation of silicon-based active materials intercalating lithium by pre-lithiation

[0093] LiCl as a lithium salt was added to γ-butyrolactone as an organic solvent so that the concentration of LiCl was 1M, and then mixed to prepare a prelithiation solution.

[0094] A mesh copper electrode and a glassy carbon electrode serving as the first electrode and the second electrode, respectively, were placed in the pre-lithiation solution.

[0095] As a silicon-based active material, SiO 2 (with an average particle size of 20 μm (D 50 )) is added to the pre-lithiation solution.

[0096] An external current was applied to the first electrode and the second electrode at a current rate of 0.1 C to perform a redox reaction. The redox reaction was carried out at 25 °C for 6 hours while stirring at 400 rpm.

[0097] A silicon-based active material intercalating lithium through pre-lithiation i...

Embodiment 2

[0105] Example 2: Manufacture of Negative Electrodes for Secondary Batteries

[0106] The negative electrode for the secondary battery of Example 2 was manufactured in the same manner as in Example 1, except that the thickness of the first negative electrode active material layer was 79 μm, the thickness of the second negative electrode active material layer was 44 μm, and the second The ratio of the thickness of the negative electrode active material layer to the thickness of the first negative electrode active material layer is about 0.56 (=44 μm / 79 μm), the carbon-based active material included in the first negative electrode active material layer and the carbon-based active material included in the second negative electrode active material layer The weight ratio of the silicon-based active material in is 80:20, and the weight ratio of the first binder included in the first negative electrode active material layer and the second binder included in the second negative electro...

Embodiment 3

[0107] Embodiment 3: the manufacture that is used for the negative electrode of secondary battery

[0108]The negative electrode for the secondary battery of Example 3 was manufactured in the same manner as in Example 1, except that the first negative electrode active material layer had a thickness of 61 μm, the second negative electrode active material layer had a thickness of 62 μm, and the second negative electrode active material layer had a thickness of 62 μm. The ratio of the thickness of the negative electrode active material layer to the thickness of the first negative electrode active material layer is 1.01 (=62 μm / 61 μm), the carbon-based active material included in the first negative electrode active material layer and the carbon-based active material included in the second negative electrode active material layer The weight ratio of the silicon-based active material is 60:40, and the weight ratio of the first binder included in the first negative electrode active ma...

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Abstract

The present invention relates to a method for manufacturing a secondary battery anode, comprising the steps of: forming, on an anode current collector, a first anode active material layer including a carbon-based active material; and forming, on the first anode active material layer, a second anode active material layer including a silicon-based active material into which lithium is inserted by prelithiation.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the priority and benefit of Korean Patent Application No. 10-2019-0006525 filed on January 18, 2019, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present application relates to a method of manufacturing a negative electrode of a secondary battery. Background technique [0004] With the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, electric vehicles, etc., the demand for small and lightweight secondary batteries with relatively high capacity has surged. In particular, since lithium secondary batteries are lightweight and have high energy density, lithium secondary batteries have drawn attention as driving power sources for portable devices. Therefore, research and development work is actively being carried out to improve the performance of lithium secondary batteries....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/1395H01M4/04H01M4/62H01M10/052
CPCH01M10/052H01M4/1393H01M4/1395Y02E60/10H01M2004/027H01M4/587H01M4/386H01M4/366H01M2004/021H01M4/621H01M4/133H01M4/134H01M4/0459H01M4/1391H01M4/0404H01M4/483
Inventor 金睿利禹相昱蔡午秉
Owner LG ENERGY SOLUTION LTD
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