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Anode for lithium secondary battery and method for manufacturing same

A lithium secondary battery and negative electrode technology, applied in the field of manufacturing the negative electrode for the lithium secondary battery, and the field of manufacturing the negative electrode, can solve the problems of increasing the risk of internal short circuit and the like

Active Publication Date: 2020-05-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the lithium layer formed on the negative electrode active material layer remains on the negative electrode active material layer even after pre-lithiation, the risk of subsequent internal short circuit may be increased, and there may be an Lithium plating seed (seed) risks

Method used

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  • Anode for lithium secondary battery and method for manufacturing same
  • Anode for lithium secondary battery and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Ethylene black as a conductive material, average particle size (D 50 ) is 7 μm SiO, natural graphite, and polyethylene oxide are mixed in a weight ratio of 2:28.5:66.5:3, and then, the prepared mixed powder is mixed into a flask with an exhaust pipe inserted therein, and the After that, disperse in an ultrasonic bath for 60 minutes while blowing (blow) N 2 .

[0084] The dispersed mixture dispersed by the above procedure was heated to 90°C near the glass transition temperature (Tg) of the thermoplastic polymer so that the dispersed mixture could be kneaded, and placed between preheated rolls (interval: 145 μm) at 100°C transported, and then cooled to room temperature to prepare a free-standing negative electrode active material layer.

[0085] A base layer is formed by applying a composition in which graphene and epoxy resin are mixed at a weight ratio of 5:95 using a spin coater on one surface of a copper current collector so that the thickness of the base layer beco...

Embodiment 2

[0087] An anode was fabricated in the same manner as in Example 1 except that the thickness of the base layer of Example 1 was formed to be 6 μm.

Embodiment 3

[0089] An anode was fabricated in the same manner as in Example 1 except that only epoxy resin was used instead of the composition mixed with graphene and epoxy resin to prepare the base layer of Example 1.

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Abstract

The present invention relates to an anode for a lithium secondary battery and a method for manufacturing the same, the anode for a lithium secondary battery comprising: an anode current collector; ananode active material layer; a lithium layer positioned between the anode current collector and the anode active material layer; and a primer layer positioned between the anode current collector and the lithium layer.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2017-0155496 filed on November 21, 2017, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a negative electrode for a lithium secondary battery and a method of manufacturing the negative electrode, and more particularly, to a negative electrode for a lithium battery including a lithium layer between a negative electrode current collector and a negative electrode active material layer. A negative electrode for a secondary battery, and a method for manufacturing the negative electrode for a lithium secondary battery. Background technique [0004] With the technological advancement of mobile devices and the increase in demand for mobile devices, the demand for secondary batteries as energy sources has rapidly increased. Among these se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/04H01M10/0525H01M4/131H01M4/62H01M4/1395H01M4/1391
CPCH01M4/131H01M4/134H01M4/1391H01M4/1395Y02E60/10H01M4/0404H01M4/0435H01M4/366H01M4/62H01M4/0459H01M10/0525H01M4/382H01M4/483H01M4/622H01M2004/027
Inventor 洪莲叔金锡九金宣圭闵智媛
Owner LG ENERGY SOLUTION LTD