Device for pre-lithiation of negative electrode and method for pre-lithiation of negative electrode

A pre-lithiation and negative electrode technology, applied in the direction of negative electrodes, lithium batteries, battery electrodes, etc., can solve the problems of pre-lithiation electrode deviation, uneven electrode pre-lithiation, hindering large-scale production, etc., and achieve the goal of preventing composition changes Effect

Pending Publication Date: 2022-06-07
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to an increase in the local resistance in the electrode, leading to inhomogeneous pre-lithiation of the electrode
This uneven pre-lithiation reduces the initial efficiency and cycle characteristics of the battery
In addition, the composition of the electrolyte solution changes due to solvent volatilization during successive pre-lithiations, which changes the shape and composition of the SEI film initially formed during the pre-lithiation process, resulting in deviations between pre-lithiated electrodes and hindering mass production

Method used

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  • Device for pre-lithiation of negative electrode and method for pre-lithiation of negative electrode
  • Device for pre-lithiation of negative electrode and method for pre-lithiation of negative electrode
  • Device for pre-lithiation of negative electrode and method for pre-lithiation of negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120]

[0121] 85.1 wt % of graphite and 9.5 wt % of SiO as negative electrode active materials, 1.3 wt % of Denka black as a conductive material, 3.0 wt % of SBR as a binder, and 1.1 wt % of a thickener CMC was added to water to prepare negative electrode slurry.

[0122]The negative electrode slurry was coated on both surfaces of a copper current collector (thickness: 8 μm), and then rolled and dried in a vacuum oven at 130° C. A negative electrode active material layer is formed on each surface, thereby manufacturing a negative electrode.

[0123] The negative electrode was wound on a negative electrode roll made of stainless steel and having a diameter of 3 inches.

[0124]

[0125] prepared as figure 2 Pre-lithiation device shown. Specifically, a pre-lithiation reactor made of stainless steel was prepared and housed in a high pressure chamber. The prelithiation solution was injected into the prelithiation reactor. The temperature of the prelithiation reactor wa...

Embodiment 2

[0131] The pre-lithiation process was repeated 10 times using the pre-lithiation solution and the pre-lithiation apparatus of Example 1 . After that, by newly inserting the negative electrode into the pre-lithiation reactor of the pre-lithiation apparatus of Example 1, a pre-lithiated negative electrode was obtained by performing pre-lithiation in the same manner as in Example 1.

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Abstract

An apparatus for pre-lithiating a negative electrode, comprising: a pre-lithiation reactor containing a pre-lithiation solution; a high-pressure chamber surrounding an outer side of the pre-lithiation reactor and maintaining an internal air pressure exceeding atmospheric pressure; at least one lithium metal counter electrode disposed in the pre-lithiation solution so as to face and be spaced apart from the negative electrode introduced into the pre-lithiation solution by a predetermined distance; and a charging and discharging unit electrically connected to the negative electrode and the lithium metal counter electrode.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0105343 filed on Aug. 21, 2020, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to an apparatus and method for prelithiation of negative electrodes. More particularly, the present invention relates to an apparatus for pre-lithiating a negative electrode including a high-voltage chamber, and a method for pre-lithiating a negative electrode. Background technique [0003] Recently, secondary batteries that can be charged and discharged have been widely used as energy sources for wireless mobile devices. In addition, secondary batteries are attracting attention as an energy source for electric vehicles, hybrid electric vehicles, and the like, and are proposed as a solution to air pollution of existing gasoline and diesel vehicles using fossil fuels. Therefore, due to the advantages of the secondary batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M10/0525
CPCH01M4/139H01M10/0525H01M2004/027H01M4/0445H01M4/483H01M4/587H01M4/364H01M4/133H01M4/131H01M4/1391H01M4/1393Y02E60/10H01M4/0459H01M10/052H01M4/0416H01M10/058
Inventor 黃丞彗金睿利李秀娟蔡午秉全㥠营
Owner LG ENERGY SOLUTION LTD
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