Negative electrode with carbon-based thin film, manufacturing method therefor, and lithium secondary battery comprising same

A lithium secondary battery, negative electrode technology, applied in electrode manufacturing, lithium storage battery, negative electrode and other directions, can solve the problems of lithium dendrite stability and performance degradation, improve electrochemical performance, increase specific surface area, uniform current density The effect of distribution

Active Publication Date: 2019-10-25
LG ENERGY SOLUTION LTD
View PDF20 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, existing lithium secondary batteries aim to solve the problem of stability and performance degradation caused by lithium dendrites formed on the electrode surface during charge and discharge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Negative electrode with carbon-based thin film, manufacturing method therefor, and lithium secondary battery comprising same
  • Negative electrode with carbon-based thin film, manufacturing method therefor, and lithium secondary battery comprising same
  • Negative electrode with carbon-based thin film, manufacturing method therefor, and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] 1) Manufacture of negative electrode

[0098] On the surface of a lithium foil with a thickness of 150 μm, a carbon-based thin film was deposited by RF sputtering for 20 minutes under the following conditions to fabricate a negative electrode.

[0099] Target diameter: 2" diameter

[0100] Substrate-target distance: 5cm

[0101] Gas for sputtering: Ar

[0102] Gas pressure for sputtering: 0.75 mTorr

[0103] Introducing flow rate of gas for sputtering: 500sccm

[0104] Sputtering power density: 8.5W / cm 2

[0105] AC voltage frequency applied to electrodes: 40kHz

[0106] 2) Manufacture of lithium secondary batteries

[0107] Lithium cobalt oxide (LCO) was used as a working electrode, and the negative electrode prepared in 1) was used as a counter electrode. After placing the polyolefin separator between the electrodes, inject it with 1M LiPF 6 An electrolytic solution prepared by dissolving in a solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC...

Embodiment 2

[0111] A negative electrode, a lithium secondary battery, and a lithium symmetric battery were fabricated in the same manner as in Example 1 except that the deposition was performed for 40 minutes.

Embodiment 3

[0113] A negative electrode, a lithium secondary battery, and a lithium symmetric battery were fabricated in the same manner as in Example 1 except that the deposition was performed for 60 minutes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Membrane thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The present invention relates to a negative electrode with a carbon-based thin film formed on at least one surface of a lithium metal layer and to a lithium secondary battery comprising the same. According to the present invention, the carbon-based thin film formed on at least one surface of the lithium metal layer not only increases the specific surface area of the negative electrode, but also blocks a side reaction by a direct contact between the lithium metal layer and an electrolyte, thereby suppressing the formation of lithium dendrite and uniformly realizing a current density distribution, and thus improving the cycle performance and reducing overvoltage, leading to an improvement in electrochemical performance of the lithium secondary battery.

Description

technical field [0001] This application claims priority and benefit from Korean Patent Application No. 10-2017-0030399 filed on March 10, 2017 and Korean Patent Application No. 10-2018-0026852 filed on March 7, 2018, the disclosure of which Incorporated herein by reference in its entirety. [0002] The present invention relates to a negative electrode having a carbon-based thin film formed on at least one surface of a lithium metal layer and a lithium secondary battery including the negative electrode. Background technique [0003] Recently, there has been a growing interest in energy storage technologies. Research and development efforts on electrochemical devices have become increasingly specific as applications have expanded to power sources for cell phones, camcorders, and notebook computers, and also to electric vehicles. [0004] Electrochemical devices are the field that has received the most attention among these aspects, and among them, the development of secondar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/134H01M4/1395C23C14/06C23C16/26C23C14/58C23C16/56C23C14/34H01M10/052
CPCH01M4/134H01M4/1395H01M10/052C23C14/34H01M4/137H01M4/133H01M4/0421H01M4/0423H01M4/0426H01M4/0428H01M4/366H01M4/62H01M4/624H01M6/40C23C14/0605C23C14/5806Y02E60/10C23C16/26C23C16/56H01M4/0471H01M4/382H01M4/625H01M4/628H01M2004/027
Inventor 崔希源金银卿金起焕禹相昱孙政佑蔡午秉
Owner LG ENERGY SOLUTION LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap