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Positive electrode material for self-supporting film type lithium secondary battery, method for preparing same, and lithium secondary battery comprising same

A technology for lithium secondary batteries and positive electrode materials, applied in the direction of lithium batteries, battery electrodes, positive electrodes, etc., can solve the problems of reduced positive electrode load, increased time and cost, and reduced energy density, achieving high load capacity, cost and The effect of time improvement

Pending Publication Date: 2022-03-18
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the positive electrode manufactured through the slurry process has a problem in that the loading of the positive electrode decreases due to the conductive material and binder used in the slurry preparation, so that the energy density also decreases
In addition, the slurry process has a problem in that the time and cost required for a series of detailed processes including mixing, coating, drying, and calendering increase

Method used

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  • Positive electrode material for self-supporting film type lithium secondary battery, method for preparing same, and lithium secondary battery comprising same
  • Positive electrode material for self-supporting film type lithium secondary battery, method for preparing same, and lithium secondary battery comprising same
  • Positive electrode material for self-supporting film type lithium secondary battery, method for preparing same, and lithium secondary battery comprising same

Examples

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preparation example Construction

[0057] Preparation method of cathode material for lithium secondary battery

[0058] figure 1 is a schematic diagram showing changes in physical properties and formability when pressing sulfur, carbon, and sulfur-carbon composites that can be used as positive electrode materials for lithium secondary batteries.

[0059] Sulfur can be shaped because its surface melts under pressure and exhibits a property of agglomerating with surrounding sulfur, but since sulfur is not flexible, a positive electrode material (cathode) in the form of a self-standing film cannot be prepared from sulfur alone.

[0060] Since carbon is flexible, but lacks cohesive strength, it cannot be individually shaped when pressed, and thus a positive electrode material (cathode) in the form of a self-standing film cannot be prepared.

[0061] Sulfur-carbon composites are composites of sulfur and porous carbon materials. In the case of a sulfur-carbon composite, since sulfur also exists on the outer surface...

preparation example 1

[0096] Preparation Example 1: Preparation of Sulfur-Carbon Composite

[0097] Sulfur (S) and carbon nanotubes (CNT) were uniformly mixed in a solid state at a weight ratio of 65:35, and then ball milled at 100 rpm for 1 hour to prepare a mixture.

[0098] The mixture was heat-treated at 155° C. for 35 minutes to load sulfur into the pores of the CNT and coat the surface thereof to prepare a sulfur-carbon composite (S-CNT). In this case, use a 350m 2 / g specific surface area of ​​CNT.

Embodiment 1

[0100] (1) Preparation of self-supporting film cathode material

[0101] Fill the mold with the sulfur-carbon composite (S-CNT) of Preparation Example 1, and use a hydraulic press to pressurize at a pressure of 1 MPa to form a carbon-containing sulfur melt, thereby preparing a self-supporting film type positive electrode material, such as figure 2 shown in .

[0102] (2) Manufacture of lithium-sulfur secondary batteries

[0103] The prepared self-supporting film type positive electrode material was prepared as a positive electrode, and lithium metal having a thickness of 150 μm was prepared as a negative electrode.

[0104] Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) at a concentration of 1M and lithium nitrate (LiNO at a concentration of 0.1M 3 ) in an organic solvent formed by mixing tetraethylene glycol dimethyl ether (TEGDME) / dioxolane (DOL) / dimethoxyethane (DME) in a volume ratio of 1:1:1 to Prepare electrolyte.

[0105] A porous polyethylene separator with a...

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Abstract

One aspect of the present disclosure relates to a positive electrode material for a self-supporting film type lithium secondary battery, a method for preparing the same, and a lithium secondary battery comprising the same. More specifically, the positive electrode material is manufactured in the form of a free-standing film containing a carbon-containing sulfur melt by using a dry method using a property in which sulfur exhibits strong self-cohesiveness under pressurized conditions and a porous carbon material exhibits flexibility. The positive electrode material itself can be applied as a positive electrode at a high load, and can improve process efficiency in terms of cost and time since it is prepared through a simplified process.

Description

technical field [0001] This application claims the benefit of priority to Korean Patent Application No. 2020-0063882 filed on May 27, 2020 and Korean Patent Application No. 2021-0064083 filed on May 18, 2021, the entire contents of which are incorporated herein by reference. [0002] One aspect of the present disclosure relates to a positive electrode material for a self-supporting film type lithium secondary battery, a preparation method thereof, and a lithium secondary battery including the same. Background technique [0003] Recently, with the rapid development of the fields of electronic devices and electric vehicles, the demand for secondary batteries is increasing. In particular, with the trend towards miniaturization and weight reduction of portable electronic devices, there is an increasing demand for secondary batteries with high energy density capable of coping with these. [0004] Among secondary batteries, a lithium-sulfur secondary battery uses a sulfur-based c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/583H01M4/625H01M10/052H01M2004/028Y02E60/10H01M4/587H01M4/382C01B17/00H01M4/0471H01M4/133H01M4/1393H01M10/0525H01M2004/021
Inventor 金潣守洪京植
Owner LG ENERGY SOLUTION LTD
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