Heat-resistant porous layer composition, separator including same, electrochemical cell using same, and manufacturing method thereof

A separator, electrochemical technology, applied in the field of heat-resistant porous layer composition, can solve problems such as thermal explosion, achieve the effect of improving battery performance, high-efficiency charging/discharging characteristics, and avoiding performance degradation

Active Publication Date: 2019-09-06
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, short-circuit current flows through the battery, and the battery continuously generates heat, which eventually leads to a thermal explosion

Method used

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  • Heat-resistant porous layer composition, separator including same, electrochemical cell using same, and manufacturing method thereof
  • Heat-resistant porous layer composition, separator including same, electrochemical cell using same, and manufacturing method thereof
  • Heat-resistant porous layer composition, separator including same, electrochemical cell using same, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-1

[0105] Preparation Example 1-1: Preparation 1-1 Solution

[0106] 7% by weight of polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP)-based copolymer (KF9300, Kureha Chemicals, weight average molecular weight: 1,000,000 g / mol, HFP: 1% by weight) and 93 % by weight of dimethylacetamide (DMAc, Daejung Chemicals & Metals Co., Ltd.), followed by stirring at 40° C. for 3 hours, whereby a 1-1 solution was prepared.

preparation example 1-2

[0107] Preparation Example 1-2: Preparation 1-2 Solution

[0108] 7% by weight of polyvinylidene fluoride (PVdF)-based homopolymer (KF1100, Kureha Chemicals, weight average molecular weight: 300,000 g / mol, HFP: 0% by weight) and 93% by weight of dimethylacetamide (DMAc , Dazhong Chemical and Metal Co., Ltd.), followed by stirring at 40° C. for 3 hours, thereby preparing a 1-2 solution.

preparation example 1-3

[0109] Preparation Example 1-3: Preparation 1-3 Solution

[0110] Mixed 7% by weight polyvinylidene fluoride (PVdF)-based homopolymer (Solvay 5130, Solvay Specialty Polymers), weight average molecular weight: 1,100,000 g / mol, HFP: 0% by weight ) and 93% by weight dimethylacetamide (DMAc, Dazhong Chemical and Metal Co., Ltd.), followed by stirring at 40° C. for 3 hours, thereby preparing a 1-3 solution.

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Abstract

The present invention provides a heat-resistant porous layer composition, a separator including a heat-resistant porous layer formed of the heat-resistant porous layer composition, and an electrochemical cell including the separator. The heat-resistant porous layer composition includes: at least one selected from the group consisting of: monomers, oligomers, and polymers represented by Formula 1, and mixtures thereof; at least one selected from the group consisting of: polymer Vinylidene fluoride homopolymers, polyvinylidene fluoride-hexafluoropropylene copolymers and mixtures thereof; initiators; and solvents, wherein based on the total weight of polyvinylidene fluoride-hexafluoropropylene copolymers, Units derived from hexafluoropropylene are present in an amount of 15% by weight or less, and the weight average molecular weight of the polyvinylidene fluoride-hexafluoropropylene-based copolymer is 600,000 g / mol or more. The separator provided by the present invention can maintain its shape without cracking even in an environment where the internal temperature of the battery rises to 200° C. or higher within a few seconds. Formula 1

Description

technical field [0001] The present invention relates to a heat-resistant porous layer composition having high heat resistance, a separator comprising the heat-resistant porous layer composition and having excellent crack resistance at high temperatures, and a separator using the heat-resistant porous layer composition. Electrochemical cells with separators and a method of making said separators. Background technique [0002] A separator for an electrochemical cell refers to an intermediate membrane that separates the anode and cathode in the battery and maintains ion conductivity throughout, thereby allowing the battery to charge / discharge. [0003] When the battery is short-circuited, a high current passes therethrough while generating heat, thereby increasing the temperature of the battery and thermally running away. As a result, the electrolyte evaporates or heats up, causing the safety valve to operate or the battery to catch fire. In order to prevent these problems, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M10/0525C08J7/043H01M50/403H01M50/417H01M50/426H01M50/451H01M50/457H01M50/489H01M50/494
CPCH01M10/052H01M10/0525H01M50/403C08J7/0427C08J7/043H01M50/451H01M50/426H01M50/489H01M50/417H01M50/494H01M50/457C08J2323/06C08J2427/16C08K3/013Y02E60/10H01M50/446
Inventor 朴鎭奎崔玹瑄洪大玄裵壬赫
Owner SAMSUNG SDI CO LTD
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