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New organic/inorganic composite porous film and electrochemical device prepared thereby

An inorganic composite and porous technology, applied in transportation and packaging, circuits, electric vehicles, etc., can solve problems such as inability to obtain safety, improve lithium ion conductivity and heat resistance, improve battery quality, and reduce interface resistance Effect

Active Publication Date: 2007-05-23
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since such films still use polyolefin-based separators, they still have the drawback of not being able to achieve significant improvements in safety, including preventing heat shrinkage at high temperatures

Method used

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  • New organic/inorganic composite porous film and electrochemical device prepared thereby
  • New organic/inorganic composite porous film and electrochemical device prepared thereby
  • New organic/inorganic composite porous film and electrochemical device prepared thereby

Examples

Experimental program
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Effect test

Embodiment 1-6

[0087] Preparation of Organic / Inorganic Composite Porous Thin Film and Its Use for Manufacturing Lithium Secondary Batteries

Embodiment 1

[0089] 1-1. Organic / inorganic composite porous film (PVdF-CTFE / BaTiO 3 ) preparation

[0090] A PVdF-CTFE polymer (polyvinylidene fluoride-chlorotrifluoroethylene copolymer) was added to acetone in an amount of about 5 wt%, and dissolved therein at 50°C for about 12 hours or more to form a polymer solution. To the polymer solution obtained as described above, BaTiO was added at a concentration of 20 wt% on a solids basis 3 powder. Then, the BaTiO 3 The powder was pulverized to a size of about 300 nm and dispersed for about 12 hours or more by using a ball milling method to form a slurry. Then, the slurry obtained as described above was coated on a porous polyethylene terephthalate substrate (porosity: 80%) with a thickness of about 20 μm using a dip coating method to a coating thickness of about 2 μm. The active layer immersed and coated on the porous polyethylene terephthalate substrate had a pore size of 0.3 μm and a porosity of 55% after measurement with a porosimeter....

Embodiment 2

[0099] Repeat Example 1 to obtain a lithium secondary battery, except using PMNPT (magnesium lead niobate-lead titanate) powder instead of BaTiO 3 powder to obtain organic / inorganic composite porous film (PVdF-CTFE / PMNPT). The active layer immersed and coated on the porous polyethylene terephthalate substrate had a pore size of 0.4 μm and a porosity of 60% after measurement with a porosimeter.

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Abstract

Disclosed is an organic / inorganic composite porous film comprising: (a) a porous substrate having pores; and (b) an active layer formed by coating a surface of the substrate or a part of the pores in the substrate with a mixture of inorganic particles and a binder polymer, wherein the inorganic particles in the active layer are interconnected among themselves and are fixed by the binder polymer, and interstitial volumes among the inorganic particles form a pore structure. A method for manufacturing the same film and an electrochemical device including the same film are also disclosed. An electrochemical device comprising the organic / inorganic composite porous film shows improved safety and quality, simultaneously.

Description

technical field [0001] The present invention relates to a novel organic / inorganic composite porous film exhibiting excellent thermal safety and lithium ion conductivity and a high degree of electrolyte swelling compared to conventional polyolefin-based separators, and to an electrochemical device comprising the same , the device ensures safety and has improved quality. Background technique [0002] Recently, there has been an increasing interest in energy storage technologies. Batteries have been commonly used as energy sources in mobile phones, small camcorders, notebook computers, PCs, and electric vehicles, leading to extensive research and development on them. In this regard, electrochemical devices are the subject of great interest. In particular, the development of rechargeable secondary batteries has been the focus of attention. [0003] Secondary batteries are chemical batteries capable of repeated charge and discharge cycles by means of reversible interchange bet...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02T10/7011Y02E60/10H01M10/052
Inventor 龙贤姮李相英金锡九安谆昊石正敦
Owner LG ENERGY SOLUTION LTD
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