Secondary battery activation method with enhanced ability to detect low voltage

A secondary battery, voltage measurement technology, applied in secondary batteries, secondary battery repair/maintenance, secondary battery charging/discharging, etc., can solve problems such as difficult to accurately select low voltage defects, to prevent failures and improve dispersion performance, and the effect of reducing the voltage drop

Pending Publication Date: 2021-02-12
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the above method has an area where the voltage drop amount of a good product and the voltage drop amount of a bad product appear at the same level, so it is difficult to accurately select a low voltage defect

Method used

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  • Secondary battery activation method with enhanced ability to detect low voltage
  • Secondary battery activation method with enhanced ability to detect low voltage
  • Secondary battery activation method with enhanced ability to detect low voltage

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0095] Preparation Example 1 - Preparation of a Secondary Battery (Common Secondary Battery) Without Foreign Substances

[0096] By mixing 96.7 parts by weight of Li[Ni] used as positive electrode active material 0.6 mn 0.2 co 0.2 ]O 2 , 1.3 parts by weight of graphite used as a conductive material and 2.0 parts by weight of polyvinylidene fluoride (PVdF) used as a binder to prepare a positive electrode mixture. A positive electrode mixture slurry was prepared by dispersing the obtained positive electrode mixture in 1-methyl-2-pyrrolidone used as a solvent. A positive electrode was prepared by coating, drying, and pressing the slurry on both sides of an aluminum foil with a thickness of 20 μm, respectively.

[0097] By mixing 97.6 parts by weight of artificial graphite and natural graphite (weight ratio: 90:10) as a negative electrode active material, 1.2 parts by weight of styrene-butadiene rubber (SBR) as a binder, and 1.2 parts by weight of carboxymethyl Cellulose-ba...

example 1

[0101] 20 secondary batteries described in Preparation Example 1 were prepared, aged at a room temperature of 25° C. for 24 hours, and pre-aged. The pre-aged secondary battery was charged to an SOC of 65% at a rate of 0.2C to complete one charge (single charge method). Then, high temperature aging was performed at a temperature of 65°C for 21 hours, and room temperature aging was performed at a room temperature of 25°C.

example 2

[0103] The activation process was performed in the same manner except that: when performing the primary charge in Example 1 above, charging was performed at a charging rate of 0.2C up to 10% of the SOC in the first charging interval, and at a charging rate of 0.2C in the second charging interval. Charging is performed at a charging rate of 0.25C up to 40% of SOC, and charging is performed at a charging rate of 0.2C up to 65% of SOC in the third charging interval (three-step charging).

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Abstract

The present invention relates to a secondary battery activation method comprising: a pre-aging step (S100) for aging, at room temperature, a secondary battery comprising a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and an electrolyte; a charging step (S200) for primarily charging the pre-aged secondary battery to a secondary battery capacity (SOC) of 60% or more; a high-temperature aging step (S300) for aging the primarily charged secondary battery at a high temperature; and a room-temperature aging step (S400) for aging, at room temperature, the secondary battery which has been aged at a high temperature, wherein thehigh-temperature aging step is performed at a temperature of 60 DEG C or higher. The activation method of the present invention has, by uniformly and stably forming a negative electrode SEI film by primary charging and accelerating the stabilization of the SEI film through high-temperature aging to thereby reduce the voltage drops of good products and improve the variation thereof, the effect ofenhancing the ability to detect low-voltage defects.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0000507 filed on January 3, 2019, and the entire content of this Korean Patent Application is incorporated herein by reference. [0002] The present invention relates to a method for activating a secondary battery, and more particularly, the present invention relates to a method for activating a secondary battery by reducing the amount of voltage drop in a good product when detecting a low voltage defect While increasing the voltage drop of defective products, it has improved low-voltage defect detection capabilities. Background technique [0003] In general, secondary batteries refer to batteries that can be charged and discharged, unlike primary batteries that cannot be charged, and are widely used in electronic devices such as mobile phones, notebook computers, video cameras, or electric vehicles. In particular, lithium secondary batteries have a larger c...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/139H01M4/04H01M10/44G01R31/3835G01R31/385
CPCY02E60/10H01M4/0447H01M10/446H01M10/0525H01M10/48Y02P70/50H01M10/058H01M4/139G01R31/3835G01R31/3865H01M10/615H01M4/364H01M2004/027H01M2004/028
Inventor李贞美裵峻晟成洛奇
OwnerLG ENERGY SOLUTION LTD