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Separator for electrochemical device and method for manufacturing same

An electrochemical and separator technology, used in electrochemical generators, hybrid capacitor separators, circuits, etc., can solve the problems of different safety characteristics, and achieve the effect of excellent adhesion and low resistance

Active Publication Date: 2020-09-22
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although many production companies have manufactured these electrochemical devices, their safety profile shows mixed signs

Method used

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  • Separator for electrochemical device and method for manufacturing same
  • Separator for electrochemical device and method for manufacturing same
  • Separator for electrochemical device and method for manufacturing same

Examples

Experimental program
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Embodiment approach

[0073] According to another embodiment of the present disclosure, the block copolymer may be represented by the formula AA-BB-AA-BB-AA-BB-AA-BB.

[0074] According to yet another embodiment of the present disclosure, the block copolymer may be represented by the formula AAAAA-B-AAAAA-B-AAAAA-B.

[0075] In other words, the block copolymer according to the present disclosure may have a structure in which specific repeating units (ie, first blocks and second blocks) are regularly and alternately connected to each other.

[0076] According to the present disclosure, the block copolymer includes a block copolymer comprising a first block having a repeating unit represented by Chemical Formula 1 and a second block having a repeating unit represented by Chemical Formula 2, wherein the first block The segments and second blocks can be distributed in the following configurations.

[0077] In other words, the block copolymer is a copolymer obtained by repeating the steps of repeatedly...

Embodiment 1

[0126] 1) Manufacture of anode

[0127] The anode active material (artificial graphite), conductive material (carbon black), dispersant (carboxymethyl cellulose, CMC, carboxymethyl cellulose) and binder polymer resin (polyvinylidene fluoride, PVdF) with 95.8:1 :1:2.2 weight ratio mixed with water to obtain anode slurry. The anode slurry is coated on a copper foil (Cu-foil) to a thickness of 50 μm to form a thin electrode plate, which is then dried at 135° C. for 3 hours or more, and then pressed to obtain an anode .

[0128] 2) Manufacture of cathode

[0129] The cathode active material (LiCoO 2 ), a conductive material (carbon black) and a binder polymer (PVdF) were introduced into N-methyl-2-pyrrolidone (NMP) at a weight ratio of 96:2:2, and then mixed to obtain a cathode slurry. The cathode slurry was charged at 3.1mAh / cm 2 The capacity was coated on an aluminum foil with a thickness of 20 μm to obtain a cathode.

[0130] 3) Manufacturing of separators

[0131] Al as...

Embodiment 2

[0138] A lithium secondary battery was obtained in the same manner as in Example 1, except that: 3) The manufacture of the separator was carried out as follows.

[0139] Specifically, the binder polymer introduced into the dispersion slurry was prepared as described below.

[0140] - A polyvinylidene fluoride-hexafluoropropylene block copolymer (LBG available from Alkema) with a weight average molecular weight of 570,000 and a weight ratio of vinylidene fluoride to hexafluoropropylene of 95:5 was used. Meanwhile, the weight average molecular weights of the vinylidene fluoride monomer and the hexafluoropropylene monomer were 540,000 and 30,000, respectively.

[0141] - A polyvinylidene fluoride-hexafluoropropylene random copolymer prepared by solution polymerization using a radical initiator diisopropylperoxydicarbonate (DIPPDC, diisopropylperoxydicarbonate, Hosung Chemex Co.) was used. Into a low-temperature reactor cooled to -30°C, introduce CFC as a solvent at a volume rati...

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Abstract

The present invention provides a separator for an electrochemical device and a method for manufacturing same, the separator comprising a block copolymer composed of a first block having a unit represented by chemical formula 1 and a second block having a unit represented by chemical formula 2. Due to said features, the present invention has low resistance, enhanced adhesion with an electrode, andimproved swelling characteristics with a solvent.

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. 10-2018-0122825 filed in Korea on October 15, 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 electrodes and batt...

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
CPCH01M10/052H01G11/52Y02E60/10H01M50/449H01M50/446H01M50/461H01M50/426H01M50/417H01M50/403H01G9/02H01M50/443H01M50/451H01M50/491H01M50/431H01M50/44C08K3/04C09D127/16Y02P70/50H01M50/411H01M10/0525
Inventor 李鍾允郑邵美成东昱张大成
Owner LG ENERGY SOLUTION LTD
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