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Electrode for secondary battery, and lithium secondary battery comprising same

A secondary battery and electrode technology, applied in battery electrodes, secondary batteries, electrode current collector coatings, etc., can solve problems such as fire and electrode explosion, prevent adhesive migration, improve fracture performance, and achieve excellent stability. sexual effect

Active Publication Date: 2018-07-31
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrodes using high-concentration nickel-cobalt-manganese lithium oxides as electrode active materials are not easily damaged by external impact due to their high elongation, which causes explosion or fire of the electrodes

Method used

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  • Electrode for secondary battery, and lithium secondary battery comprising same
  • Electrode for secondary battery, and lithium secondary battery comprising same
  • Electrode for secondary battery, and lithium secondary battery comprising same

Examples

Experimental program
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Effect test

preparation example 1

[0084] 97.5 parts by weight of Li[Ni] with an average particle size of 13 μm as the positive electrode active material 0.6 co 0.2 mn 0.2 ]O 2 , 1 weight part of Denka black as a conductive material and 1.5 weight parts of PVDF as a binder were mixed with N-methylpyrrolidone (NMP) to prepare positive electrode active material slurry A.

[0085] The positive electrode active material slurry A was coated on one surface of an aluminum collector having a thickness of 70 μm, and then dried at 130° C. to form an electrode active material layer.

preparation example 2

[0087] 97.5 parts by weight of Li[Ni] with an average particle size of 7 μm as the positive electrode active material 0.6 co 0.2 mn 0.2 ]O 2 , 1 weight part of Denka black as a conductive material and 1.5 weight parts of PVDF as a binder were mixed with NMP to prepare a positive electrode active material slurry B.

[0088] The positive electrode active material slurry B was coated on one surface of an aluminum collector having a thickness of 70 μm, and then dried at 130° C. to form an electrode active material layer.

preparation example 3

[0090] 97.5 parts by weight of Li[Ni] with an average particle size of 11 μm as the positive electrode active material 0.8 co 0.1 mn 0.1 ]O 2 1. Denka black as a conductive material and 1.5 parts by weight of PVDF as a binder were mixed with NMP to prepare positive active material slurry C.

[0091] The positive electrode active material slurry C was coated on one surface of an aluminum collector having a thickness of 65 μm, and then dried at 130° C. to form an electrode active material layer.

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Abstract

The invention discloses an electrode for a secondary battery, and a method for manufacturing the electrode. According to the present invention, a secondary battery having ensured stability by allowingan excellent evaluation to be received in a nail penetration test while having a high capacity can be manufactured. To this end, disclosed is an electrode for a secondary battery, comprising: a current collector; a first electrode active material layer formed on the current collector; and a second electrode active material layer formed on the first electrode active material layer, wherein the tensile strain of the layer comprising the current collector and the first electrode active material layer is 1.2% or less.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority and benefit of Korean Patent Application No. 10-2016-0073967 filed on June 14, 2016 and Korean Patent Application No. 10-2017-0074716 filed on June 14, 2017. The disclosure thereof is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to an electrode for a secondary battery and a lithium secondary battery including the electrode, and particularly relates to an electrode for a secondary battery having a high capacity and ensuring stability, and a lithium secondary battery including the electrode. Background technique [0004] In order to use an electronic device mounted with a secondary battery capable of repeated charging and discharging for a long time, a secondary battery having a higher capacity per unit area is preferable. However, secondary batteries need to also secure high stability against damage or fire caused by exter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M4/525H01M4/505
CPCH01M2004/021H01M10/0525H01M4/525H01M4/131Y02E60/10H01M10/48H01M4/1391H01M4/0404H01M4/505H01M10/052H01M4/623H01M4/661H01M4/583H01M2004/028H01M2004/027
Inventor 闵智媛河会珍尹钟建金锡九尹汝敬J·都勒
Owner LG ENERGY SOLUTION LTD
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