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Positive electrode for lithium secondary battery, and lithium secondary battery including same

A lithium secondary battery and cathode technology, applied in the field of lithium secondary batteries, can solve problems such as limited effects, minimize the increase in battery resistance, improve storage stability, and maintain capacity retention.

Pending Publication Date: 2021-12-03
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, an electrode manufactured by a general atomic layer deposition process has an atomic layer deposition layer formed only near the surface, and thus has a limited effect

Method used

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  • Positive electrode for lithium secondary battery, and lithium secondary battery including same
  • Positive electrode for lithium secondary battery, and lithium secondary battery including same
  • Positive electrode for lithium secondary battery, and lithium secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] The atomic layer deposition step was performed in the same manner as Comparative Example 2, but the injection time of the precursor, the reaction gas, and the purge gas and the number of times the atomic layer deposition process were different. Trimethyl aluminum (Al (CH) 3 ) 3 The injection time is set to 0.5 seconds, and after 10 seconds of the AR which is used as an inert gas, water vapor is supplied for 1 second to substituize aluminum methyl aluminum with OH. Subsequently, by purging the additional 20 seconds using Ar, the impurities and unreacted ingredients in the system are purged. The atomic layer deposition process was repeated for 5 to manufacture a positive electrode having a thickness of about 0.55 nm formed on the surface of the positive electrode active material layer.

Embodiment 2

[0109] The atomic layer deposition step was performed in the same manner as Comparative Example 2, but the injection time of the precursor, the reaction gas, and the purge gas and the number of times the atomic layer deposition process were different. Trimethyl aluminum (Al (CH) 3 ) 3 The implantation time is set to 2 seconds, and after 50 seconds of the AR which is used as an inert gas, water vapor is supplied for 2 seconds to substituize aluminum methyl aluminum with an OH. Subsequently, by purging for another 50 seconds as an an inert gas, the impurities and unreacted ingredients in the system are removed. The atomic layer deposition step was repeated twice to fabricate the positive electrode of the alumina coating having a thickness of about 0.24 nm on the surface of the positive electrode active material layer.

Embodiment 3

[0111] The atomic layer deposition step was performed in the same manner as Comparative Example 2, but the injection time of the precursor, the reaction gas, and the purge gas and the number of times the atomic layer deposition process were different. Trimethyl aluminum (Al (CH) 3 ) 3 The implantation time is set to 2 seconds, and after 50 seconds of the AR which is used as an inert gas, water vapor is supplied for 2 seconds to substituize aluminum methyl aluminum with an OH. Subsequently, by purging for another 50 seconds as an an inert gas, the impurities and unreacted ingredients in the system are removed. The atomic layer deposition process was repeated 7 times to manufacture a positive electrode having a thickness of about 0.84 nm formed on the surface of the positive electrode active material layer.

[0112] The cross-sectional electron microscope image of the positive electrode having the prepared atomic layer deposited coating and the elemental mapping image of aluminum me...

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Abstract

Provided is a positive electrode for a lithium secondary battery and a lithium secondary battery including same, wherein the positive electrode comprises: a collector; and a positive electrode active material layer which is provided with a plurality of positive electrode active materials positioned on at least one surface of the collector, and with an atomic layer deposition coating layer positioned on the surfaces and inside the pores of the positive electrode active materials, as well as within the gaps in between the plurality of positive electrode active materials. The thickness of the atomic layer deposition coating layer is 0.2 to 1 nm. If the positive electrode active material layer is divided into five sections in the thickness direction, and the portion of the positive electrode active material layer in surface contact with the collector is referred to as the lowermost positive electrode active material layer, and the surface portion of the positive electrode active material layer farthest away from the collector is referred to as the uppermost positive electrode active material layer, the ratio of the content of the atomic layer deposition coating layer of the lowermost positive electrode active material layer to the content of the atomic layer deposition coating layer of the uppermost positive electrode active material layer is at least 40 wt%. Also, the porosity of the lithium secondary battery is 15 to 35%.

Description

Technical field [0001] The present disclosure relates to a lithium secondary battery having a positive electrode and a lithium secondary battery using the same. More particularly, the present disclosure relates to a lithium secondary battery having a positive electrode of a lithium secondary battery, the lithium secondary battery having improved cycle characteristics and storage stability of the positive electrode. [0002] This application claims the May 31, 2019 in the interests of Korean Patent Application No. 10-2019-0064862 filed in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Recently, the focus on energy storage technologies has increased dramatically. As applications of the energy storage technology has been extended to mobile phones, camcorders, notebook computers and even electric vehicle, the power requirements for batteries used in the electronic device of a high ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525C23C16/40H01M4/62H01M10/052Y02E60/10H01M2004/028H01M4/131H01M4/1391H01M4/0421H01M4/525H01M4/362C23C16/45555C23C16/045H01M4/139H01M4/0428C23C16/403H01M4/485H01M2004/021
Inventor 李恩政金起焕金容赞金忍哲朴相俊
Owner LG ENERGY SOLUTION LTD