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Separator for electrochemical device and electrochemical device containing same

An electrochemical and separator technology, used in electrochemical generators, hybrid capacitor separators, battery electrodes, etc., can solve the problems of porous polymer substrate damage, high wear, separator damage, etc., to improve the thermal shrinkage rate. Effect

Pending Publication Date: 2020-12-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, alumina has high hardness, causing high wear in processing equipment, so the separator is likely to be damaged by external foreign matter
Furthermore, due to this high hardness, the porous polymer substrate may be damaged during thermal fusion

Method used

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  • Separator for electrochemical device and electrochemical device containing same

Examples

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Comparison scheme
Effect test

preparation example Construction

[0051] As used herein, the terms "about", "substantially" or similar terms are used as a starting point from or adjacent to a specified value when acceptable manufacturing and material tolerances specific to the stated meaning are suggested. and are used for the purpose of preventing undue use by irresponsible offenders of the disclosure, including precise or absolute values, which are provided to aid in the understanding of the disclosure.

[0052] As used herein, the term "their combination" included in any Markush-type expression refers to a combination or mixture of one or more elements selected from the group of elements disclosed in the Markush-type expression , and refers to the presence of one or more elements selected from this group.

[0053] As used herein, the expression "A and / or B" means "A, B, or both".

[0054] In order to solve the safety-related problems of electrochemical devices such as lithium secondary batteries, a separator has been proposed, which cons...

Embodiment 1

[0125] 1) Manufacture of anode

[0126] Artificial graphite, carbon black, carboxymethylcellulose (CMC, carboxymethylcellulose) and styrene-butadiene rubber (SBR, Styrene Butadiene Rubber) as the anode active material were introduced into water at 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 onto a copper foil (Cu-foil) with a thickness of 50 μm as an anode current collector to form a thin electrode plate, which was then dried at 135° C. for 3 hours or longer, and then pressed (pressing) to obtain the anode.

[0127] 2) Manufacture of cathode

[0128] 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 at a weight ratio of 96:2:2 and mixed therein to prepare a cathode slurry. The cathode slurry was coated at a capacity of 3.28 mAh / g on an aluminum foil having a thi...

Embodiment 2 and 3

[0135] An electrode assembly was obtained in the same manner as in Example 1, except that the average particle diameter and specific surface area of ​​the boehmite particles were controlled as shown in Table 1 below.

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Abstract

Provided is a separator for an electrochemical device, comprising: a porous polymer substrate having a plurality of pores; and a porous coating layer formed on at least one surface of the porous polymer substrate, and including boehmite particles and a binder polymer positioned on a part or all of the boehmite particles to connect and fix the particles, wherein the boehmite particles have an average particle diameter of 2.0 to 3.5 [mu]m and a specific surface area of 4.0 m2 / g to 4.5 m2 / g, wherein the thickness of one surface of the porous coating layer is 2 to 10[mu]m.

Description

technical field [0001] The present disclosure relates to a separator suitable for an electrochemical device such as a lithium secondary battery, and an electrochemical device including the same. [0002] This application claims priority from Korean Patent Application No. 10-2018-0167923 filed in Korea on December 21, 2018, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, energy storage technology has received increasing attention. Efforts to develop electrochemical devices have increasingly been realized as the application of energy storage technology has expanded to energy for mobile phones, video cameras and notebook PCs, and even for electric vehicles. In this context, electrochemical devices have attracted the most attention. Among these electrochemical devices, the development of rechargeable secondary batteries has been attracting attention. Recently, in developing such batteries, research on designing new electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01G11/52H01M50/443H01M50/489
CPCH01G11/52Y02E60/10H01M50/414H01M50/443H01M50/446H01M50/451H01M50/46H01M10/0525H01M50/417H01M50/434H01M50/489H01M10/4235H01M10/052H01M50/491H01M50/431H01M50/457H01M50/461H01M4/622
Inventor 成寅赫权慧珍成东昱
Owner LG ENERGY SOLUTION LTD
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