Method for manufacturing anode

A negative electrode and negative active material technology, applied in impregnation manufacturing, electrode manufacturing, battery electrodes, etc., can solve the problem of uniform diffusion of lithium/lithium ions, achieve the effect of improving processing performance and product quality consistency, and improving life characteristics

Pending Publication Date: 2021-12-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since it is difficult to uniformly diffuse lithium / lithium ions in the negative electrode structure, the difficulty of the above method lies in the formation of uniform pre-lithiation or passivation film

Method used

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  • Method for manufacturing anode

Examples

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Embodiment 1

[0113] Embodiment 1: the manufacture of negative electrode

[0114]

[0115] By mixing natural graphite (average particle size (D 50 ): 20μm) and SiO (average particle size (D 50 ): 5 μm) to prepare negative electrode active materials.

[0116] Mix negative active material, Denka black as conductive material, SBR (styrene-butadiene rubber) as binder, and CMC (carboxymethyl cellulose) as thickener in a weight ratio of 92:3:3.5:1 , thus preparing negative electrode slurry.

[0117] The negative electrode slurry was applied to both surfaces of a copper current collector (thickness: 8 μm), and the resulting copper current collector was subjected to roll press and dried in a vacuum oven at 130° C. for 12 hours to form an Negative electrode active material layers (thickness: 70 μm) were formed on both surfaces of the electric device, thereby preparing a negative electrode structure.

[0118] The negative electrode structure was wound on a negative electrode roll made of stainl...

Embodiment 2

[0137] Example 2: Manufacture of Negative Electrode

[0138] The negative electrode of Example 2 was manufactured in the same manner as in Example 1, except that a pre-lithiation bath with a width, length, and height of 90 cm × 20 cm × 50 cm was used, and the impregnation section, pre-lithiation The section, and the aging section are separated by a length ratio of 2:1:1.5, and the negative electrode structure moves through the aging section within 30 minutes.

Embodiment 3

[0139] Embodiment 3: the manufacture of negative electrode

[0140] The negative electrode of Example 3 was manufactured in the same manner as in Example 1, except that a pre-lithiation bath with a width, length, and height of 280 cm × 20 cm × 50 cm was used, and the impregnation section, pre-lithiation The segment, and the aging segment are separated by a length ratio of 2:1:11, and the negative electrode structure moves through the aging segment within 220 minutes.

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Abstract

The present invention relates to a method for manufacturing an anode, the method comprising the steps of: providing an anode roll obtained by coiling an anode structure comprising an anode current collector and an anode active material layer formed on at least one surface of the anode current collector; providing a pre-lithiation reaction tank divided in sequence into an impregnation section, a pre-lithiation section, and an aging section, and containing a pre-lithiation solution; uncoiling the anode structure from the anode roll, and impregnating the anode structure with the pre-lithiation solution while moving the anode structure through the impregnation section; passing the anode structure through the impregnation section, and performing pre-lithiation of the anode structure while moving the anode structure through the pre-lithiation section; and passing the anode structure through the pre-lithiation section, and aging the anode structure while moving the anode structure through the aging section, wherein the pre-lithiation is performed by placing a lithium metal counter electrode, spaced apart from the anode structure and impregnated with the pre-lithiation solution, in the pre-lithiation section and electrochemically charging the anode structure.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2019-0055011 filed on May 10, 2019, the disclosure of which is incorporated herein by reference in its entirety. technical field [0004] The invention relates to a method for manufacturing a negative electrode. Background technique [0005] Recently, in order to cope with the rapid spread of battery-using electronic devices such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries that are small in size, light in weight, and relatively high in capacity is rapidly increasing. In particular, lithium secondary batteries have been in the spotlight as driving power sources for portable devices due to their light weight and high energy density. Therefore, research and development work to improve the performance of lithium secondary batteries has been ongoing. [0006] A lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCH01M4/139H01M4/1393H01M4/587H01M4/0459H01M4/0416H01M4/1395H01M4/386H01M10/052H01M4/1391H01M4/483H01M4/364H01M10/0525
Inventor 蔡午秉金睿利
Owner LG ENERGY SOLUTION LTD
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