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Method for producing anode and anode produced therefrom

A technology of negative electrode and negative electrode slurry, which is applied in the field of negative electrode manufacturing, can solve the problems of excessive consumption of electrolyte, expensive lithium metal, and reduction of electrolyte, and achieve the effect of minimizing the gap phenomenon

Active Publication Date: 2020-08-11
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a gap phenomenon occurs in the positive electrode / separator / negative electrode forming the battery cell, thereby interrupting smooth charging / discharging
[0007] Besides, it is economically unfavorable to attach Li metal to the whole anode since the Li metal used for pre-lithiation is expensive.
Besides, the electrolyte is significantly reduced during pre-lithiation due to excess lithium, resulting in excessive consumption of electrolyte and negative electrochemical effects caused by by-products.

Method used

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  • Method for producing anode and anode produced therefrom
  • Method for producing anode and anode produced therefrom
  • Method for producing anode and anode produced therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2 and comparative example 1 to 4

[0064]

Embodiment 1

[0066] step 1

[0067] First, 92% by weight of a mixture of graphite and SiO (weight ratio 7:3), 3% by weight of carbon black (Denka black, conductive material), 3.5% by weight of SBR (binder), and 1.5% by weight of CMC (thickener) were added to water as a solvent to obtain negative electrode slurry. The slurry was coated on one surface of a copper current collector, followed by drying and pressing to form a negative electrode active material layer, thereby providing an initial negative electrode.

[0068] step 2

[0069] A lithium metal foil having a thickness of 40 μm was cut to a size of 1 cm (width)×2 cm (length) to obtain a plurality of pattern units. These pattern units were arranged and arranged with a predetermined pitch on the active material layer of the initial negative electrode, and pressurization was performed at room temperature under a linear pressure of 5 kN / cm.

[0070] step 3

[0071] The initial negative electrode to which the lithium metal foil p...

Embodiment 2

[0075] step 1

[0076] First, 92% by weight of a mixture of graphite and SiO (weight ratio 7:3), 3% by weight of carbon black (Denka black, conductive material), 3.5% by weight of SBR (binder), and 1.5% by weight of CMC (thickener) were added to water as a solvent to obtain negative electrode slurry. The slurry was coated on one surface of a copper current collector, followed by drying and pressing to form a negative electrode active material layer, thereby providing an initial negative electrode.

[0077] step 2

[0078] A lithium metal foil having a thickness of 20 μm was cut to a size of 2 cm (width)×2 cm (length) to obtain a plurality of pattern units. These pattern units were arranged and arranged with a predetermined pitch on the active material layer of the initial negative electrode, and pressurization was performed at room temperature under a linear pressure of 5 kN / cm.

[0079] step 3

[0080] The initial negative electrode to which the lithium metal foil p...

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Abstract

The present invention relates to a method for producing a lithium secondary battery, comprising: (S1) preparing a preliminary anode by coating an anode slurry containing an anode active material, a conductive material, a binder, and a solvent on at least one surface of a current collector, drying and rolling same to form an anode active material layer; (S2) coating a lithium metal foil on the surface of the anode active material layer of the preliminary anode in the form of a pattern in which a pattern unit is arranged; (S3) punching the preliminary anode in which the lithium metal foil is pattern-coated to obtain an anode unit; (S4) impregnating the anode unit with an electrolyte to produce a pre-lithiated anode; and (S5) assembling the anode produced in step (S4) together with a cathodeand a separator, wherein in step (S4), the pattern unit is positioned at a central portion of each anode unit, and at the same time, the pattern unit is punched to a size occupying an area of 10% to less than 100% of the surface of the anode unit.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2018-0032219 filed in Korea on March 20, 2018. The present disclosure relates to a method of manufacturing an anode. More specifically, the present disclosure relates to a method of fabricating a pre-lithiated anode that improves the initial efficiency of the anode. Background technique [0002] As technology advances and the demand for mobile devices has increased, the demand for secondary batteries as an energy source has increased. Among these secondary batteries, lithium secondary batteries having high energy density and operating voltage, long cycle life, and low discharge rate have been commercialized and widely used. [0003] A lithium secondary battery includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode to isolate them from each other, and an electrolyte in electrochemical communication with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M4/139Y02E60/10H01M4/0404H01M4/043H01M4/134H01M4/133H01M4/1395H01M2300/0028H01M2220/20H01M4/622H01M4/624H01M4/1393H01M4/583H01M4/386H01M4/387H01M4/587H01M4/366H01M4/382Y02P70/50H01M4/0459H01M4/0416H01M4/0471H01M4/364H01M4/621H01M4/661H01M2004/021H01M2004/027
Inventor 蔡午秉禹相昱金帝映
Owner LG ENERGY SOLUTION LTD