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Separator for lithium secondary battery and method for manufacturing same

A lithium secondary battery and separator technology, which is applied in the direction of secondary batteries, lithium batteries, hybrid capacitor separators, etc., can solve the problems of increased processing costs, exposure of harmful materials, etc., to ensure mechanical properties and thermal properties, improve adhesion Adhesion, the effect of improving the efficiency of manufacturing and processing

Active Publication Date: 2020-09-25
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such methods result in increased disposal costs or the risk of exposure to hazardous materials such as ozone

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0151] 1) Manufacture of anode

[0152] Artificial graphite, carbon black, carboxymethyl cellulose (CMC, Carboxy Methyl Cellulose) and styrene-butadiene rubber (SBR, Styrene-Butadiene Rubber) were introduced into water with a weight ratio of 96:1:2:2, and mixed therein to Prepare anode slurry. The anode slurry was coated at a capacity of 3.55 mAh / g on a copper foil (Cu-foil) as an anode current collector with a thickness of 50 μm to form a thin electrode plate, which was then dried at 135° C. for 3 hours or longer time, and then pressing (pressing) to obtain the anode.

[0153] 2) Manufacture of cathode

[0154] LiNi as the cathode active material 0.6 co 0.2 mn 0.2 o 2 , carbon black, and polyvinylidene fluoride (PVDF, Polyvinylidene Fluoride) were introduced into N-methyl-2-pyrrolidone (NMP) at a weight ratio of 96:2:2, and mixed therein to prepare a cathode slurry. The cathode slurry at 3.28mAh / cm 2 A capacity of 20 μm was coated on an aluminum foil as a cathode curr...

Embodiment 2-1 to 4-1

[0163] An electrode assembly was obtained in the same manner as in Example 1-1, except that the composition of the slurry for forming the porous coating was controlled as shown in Table 1.

Embodiment 1-2 to 4-2

[0165] An electrode assembly was obtained in the same manner as in Example 1-1, except that the porous polymer substrate in each of Examples 1-1 to 4-1 was subjected to plasma discharge treatment. Specifically, plasma discharge treatment was performed under the condition of 10 kV at 5 m / min by using a plasma power supply instrument (plasma power supply).

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Abstract

Provided are a separator for an electrochemical element and a method for manufacturing same. The separator comprises: a porous polymer substrate having a plurality of pores; and a porous coating layerthat is formed on at least one surface of the porous polymer substrate and which comprises: a mixture of inorganic particles and a particulate binder polymer; and a polyvinylpyrrolidone binder polymer positioned on a part or entirety of surfaces of the particles in the mixture to connect and fix the particles to each other, wherein the polyvinylpyrrolidone binder polymer is used at a content of 2to 20 parts by weight on the basis of the total content of 100 parts by weight of binder polymers. Therefore, the present invention can provide a separator having a Lami strength equal or similar tothat of a conventional separator and low resistance even without surface treatment of the porous polymer substrate.

Description

technical field [0001] The present disclosure relates to a separator applicable to an electrochemical device such as a lithium secondary battery and a method of manufacturing the same. [0002] This application claims priority from Korean Patent Application No. 10-2018-0140242 filed in Korea on November 14, 2018, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, energy storage technology has received increasing attention. As the application of energy storage technology has expanded to energy sources for mobile phones, camcorders, and notebook computers, and even electric vehicles, research and development efforts on electrochemical devices have been increasingly realized. In this context, electrochemical devices have received the most attention. Among these electrochemical devices, the development of rechargeable secondary batteries has been the focus of attention. Recently, active research has been conducted on designing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01G11/52H01M50/443
CPCH01M10/052H01G11/52Y02E60/10H01M50/449H01M50/414H01M50/431H01M50/454H01M50/446H01M10/0525H01M50/443H01M50/411H01M50/403H01M50/46H01M50/491Y02P70/50H01M4/622
Inventor 成寅赫权慧珍
Owner LG ENERGY SOLUTION LTD