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Negative Electrode for Lithium Secondary Battery Method for Preparing the Same and Lithium Secondary Battery Comprising the Same

A technology of lithium secondary battery and manufacturing method, applied in electrode manufacturing, secondary battery, lithium storage battery, etc., can solve problems such as insufficient research results of lithium metal negative electrode, achieve uniform ionic conductivity, uniform electronic conductivity, inhibit secondary effect of reaction

Pending Publication Date: 2021-02-05
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, research results on protective layers of lithium metal anodes that can improve the overall battery performance of lithium secondary batteries are insufficient.

Method used

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  • Negative Electrode for Lithium Secondary Battery Method for Preparing the Same and Lithium Secondary Battery Comprising the Same
  • Negative Electrode for Lithium Secondary Battery Method for Preparing the Same and Lithium Secondary Battery Comprising the Same
  • Negative Electrode for Lithium Secondary Battery Method for Preparing the Same and Lithium Secondary Battery Comprising the Same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115]Embodiment 1: Negative electrode for lithium secondary battery

[0116] according to figure 2 In the process shown, a negative electrode for a lithium secondary battery was prepared in the following manner.

[0117] (1) Forming a three-dimensional structure of metal hydroxide (Cu(OH) 2 NW foil)

[0118] The metal was a Cu foil with a thickness of 18 μm, and an etching solution prepared by mixing a 0.133 M ammonium persulfate aqueous solution and a 2.67 M NaOH aqueous solution at a weight ratio of 1:1 was used as an etching solution for metal.

[0119] Cu foil was etched by immersing it in this etching solution for 10 min, washed with water and ethanol, and vacuum-dried in an oven at 50 °C to prepare Cu(OH) 2 NW foil (which is Cu hydroxide having a three-dimensional structure) (NW: nanowire).

[0120] (2) A three-dimensional structured metal nitride (Cu 3 NNW foil)

[0121] In an inert atmosphere formed by nitrogen, by flowing ammonia gas to Cu(OH) 2 NW foil, that...

Embodiment 2

[0125] Embodiment 2: Lithium secondary battery (for full cell test)

[0126] Use the negative electrode prepared in Example 1 (transfer the three-dimensional structure onto lithium with a thickness of 500 μm to form a protective layer), and use LCO (LiCoO 2 ): Ketjen black: Polyvinylidene fluoride (PVDF) mixed in a ratio of 8:1:1 The LCO electrode was prepared as the positive electrode. Using EC / DEC (3:7, v / v) as solvent, 1.3M LiPF 6 The electrolytic solution and the polypropylene diaphragm that the composition preparation of FEC of 5% by weight come to manufacture the lithium secondary battery of coin cell form (EC: ethylene carbonate, DEC: diethyl carbonate, FEC: fluoroethylene carbonate ).

experiment example 1

[0141] Experimental example 1: Photoelectron analysis experiment

[0142] In Example 1, the metal nitride (Cu 3 N NW foil) after transfer to the lithium metal layer, experiments using photoelectron spectroscopy (X-ray photoelectron spectroscopy, XPS) were carried out on the fabricated negative electrode in order to confirm whether lithium nitride was formed.

[0143] image 3 Is Example 1 (Li 3 N@Cu 3 N NW-Li) and Comparative Example 1 (naked Li) X-ray photoelectron spectroscopy (XPS) figure of each anode.

[0144] refer to image 3 , it can be seen that in the negative electrode of Example 1, the metal nitride (Cu 3 NNW foil) transferred to the Li metal layer, through the spontaneous reaction of Cu 3 N is reduced to Cu and Li is generated 3 N.

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Abstract

The present invention pertains to a negative electrode for a lithium secondary battery, a method for manufacturing same, and a lithium secondary battery including same. More specifically, the negativeelectrode for a lithium secondary battery according to the present invention has a protective layer containing a three-dimensional structure composed of metal and lithium nitride, and thus uniform ionic conductivity and electrical conductivity can be induced on the surface of the negative electrode.

Description

technical field [0001] This application claims priority based on Korean Patent Application No. 10-2019-0026807 filed on March 8, 2019 and Korean Patent Application No. 10-2020-0027055 filed on March 4, 2020, all of which are incorporated by reference The content is incorporated into this article. [0002] The present invention relates to a negative electrode for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery including the negative electrode. Background technique [0003] Until recently, there has been considerable interest in developing batteries with high energy density using lithium as the anode. For example, compared to other electrochemical systems with lithium-intercalated carbon anodes and nickel or cadmium electrodes due to the presence of non-electroactive materials that increase the weight and volume of the anode, thereby reducing the energy density of the battery, due to the low weight and high Therefore, lithium meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/052C23F1/32C23C22/60C23C22/83
CPCY02E60/10H01M4/134H01M4/1395H01M10/052C23C8/24C23F1/34C23C22/83C23C22/60H01M4/382H01M2004/021H01M4/62H01M4/626H01M2004/027H01M4/04C23F1/32C23C8/02C23C8/48H01M4/0402H01M10/0525H01M4/366
Inventor 朴恩囧张民哲宋泰燮宣世镐李东洙孙炳国
Owner LG ENERGY SOLUTION LTD
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