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Lithium battery cell restoring method using heat treatment, and lithium battery cell manufacturing method including same

A lithium battery, high temperature treatment technology, applied in the direction of electrolyte battery manufacturing, lithium battery, electrical components, etc., can solve problems such as loss of capacity

Pending Publication Date: 2021-04-27
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in this approach, some capacity is lost and there is limited protection against degradation during operation

Method used

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  • Lithium battery cell restoring method using heat treatment, and lithium battery cell manufacturing method including same
  • Lithium battery cell restoring method using heat treatment, and lithium battery cell manufacturing method including same
  • Lithium battery cell restoring method using heat treatment, and lithium battery cell manufacturing method including same

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0067] Manufacture of cathode

[0068] 0.5Li to be used as positive electrode active material2 MnO 3 0.5Li(Ni 0.45 mn 0.35 Ni 0.20 )O 2 , conductive material (carbon black, carbon black) and binder (PVdF) were added to NMP (N-methyl-2-pyrrolidone, N-methyl-2-pyrrolidone) with a weight ratio of 90:5:4, and carried out mixed to prepare a positive electrode mixture.

[0069] The prepared positive electrode mixture was coated on a 20 μm thick aluminum foil with a thickness of 80 μm, and then rolled and dried to manufacture a positive electrode.

[0070] Manufacture of negative electrode

[0071] Artificial graphite used as negative electrode, conductive material (carbon black, carbon black), conductive material (carbon black, carbon black) and binder (PVdF) were added to NMP (N-methyl -2-pyrrolidone, N-methyl-2-pyrrolidone), and mixed to prepare the negative electrode mixture.

[0072] The prepared negative electrode mixture was coated on a 20 μm thick copper foil with...

example 1

[0076] The process of charging the lithium battery cell prepared in Preparation Example at 0.33C to 4.2V and discharging at 1.0C to 2.5V was repeated to measure changes in capacity and voltage according to the progress of the cycle.

[0077] exist figure 1 Results for up to 40 cycles are shown in .

[0078] refer to figure 1 , it can be seen that as the cycling progresses, the changes in capacity and voltage move along the direction of the arrows, so that the overvoltage increases and the capacity decreases.

Embodiment 1

[0080] While repeating the process of charging the lithium battery cell prepared in Preparation Example at 0.33C to 4.2V and discharging at 1.0C to 2.5V in a chamber at 25°C, the discharge was measured with a charge / discharge device of PNE Corporation capacity. When the discharge capacity reached about 90% of the initial discharge capacity (degradation rate: 10%, 40 cycles), the cycle was stopped. The battery cell was subjected to a high-temperature treatment at 80° C. for 6 hours in a state where the SOC was 0.

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PUM

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Abstract

The present invention relates to: a lithium battery cell restoring method for restoring a degraded lithium battery cell having an electrode assembly which includes a cathode, an anode and a separation membrane interposed therebetween and which is impregnated in a non-aqueous electrolyte and is built in a battery case, and for high temperature treating an at least 5% degraded lithium battery cell for 1 to 6 hours in a range of 60 DEG C to 100 DEG C in a fully discharged state; and a lithium battery cell manufacturing method including the restoring method.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0101266 filed with the Korean Intellectual Property Office on August 19, 2019, the entire disclosure of which is incorporated herein by reference. [0003] The present disclosure relates to a method of restoring a lithium battery cell by heat treatment and a method of manufacturing a lithium battery cell including the method. Background technique [0004] Recently, there has been an increasing interest in energy storage technologies. As energy storage technology expands to cellular phones, camcorders, and notebook computers, and further to electric vehicles, there is an increased demand for highly energy-concentrated batteries for use as power sources for such electronic devices. Lithium-ion secondary batteries are batteries that can best meet these needs, and much research is currently underway. [0005] A secondary batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/0525
CPCH01M10/4242H01M10/0525H01M50/105Y02E60/10Y02P70/50H01M10/052
Inventor 催贤俊金荣德金大洙
Owner LG ENERGY SOLUTION LTD