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Organic/inorganic composite porous film and electrochemical device prepared thereby

An inorganic composite, porous film technology, used in circuits, electrical components, lithium batteries, etc., can solve the problems of insufficient electrolyte and reduced battery performance, improve lithium ion conductivity and heat resistance, and improve battery performance. The effect of interfacial resistance

Active Publication Date: 2007-07-18
LG ENERGY SOLUTION LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, since the electrolyte prepared as described above has no pores therein or, if any, has only pores with a size of several angstroms (A) formed by introducing an artificial plasticizer and a low porosity, the electrolyte Does not function adequately as a separator, resulting in reduced battery performance

Method used

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  • Organic/inorganic composite porous film and electrochemical device prepared thereby
  • Organic/inorganic composite porous film and electrochemical device prepared thereby

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Embodiment 1-9

[0090] Preparation of Organic / Inorganic Composite Porous Thin Film and Its Use to Fabricate Lithium Secondary Batteries

Embodiment 1

[0092] 1-1. Organic / inorganic composite porous film (PVdF-HFP / BaTiO 3 ) Preparation of PVdF-HFP polymer (polyvinylidene fluoride-hexafluoropropylene copolymer) in an amount of about 5 wt% was added to tetrahydrofuran (THF), 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 with a particle diameter of about 400 nm was added at a concentration of 20% by weight based on the total solids content. 3 powder, and then dispersed to form a mixed solution (BaTiO 3 / PVdF-HFP=80:20 (weight ratio)). Then, the mixed solution obtained as described above was coated on a Teflon sheet by using a doctor blade coating method. After coating, THF was dried, and the Teflon sheet was separated to obtain the final organic / inorganic composite porous film (see Figure 1). The final film has a thickness of about 30 μm. The final organic / inorganic composite porous film had a pore size of 0.4 μm and a porosi...

Embodiment 2

[0101] Repeat embodiment 1 to obtain lithium secondary battery, except using BaTiO 3 and Al 2 o 3 (weight ratio = 20:80) mixed powder instead of BaTiO 3 powder to obtain organic / inorganic composite porous film (PVdF-HFP / BaTiO 3 -Al 2 o 3 ). The final organic / inorganic composite porous film had a thickness of 25 μm, a pore size of 0.3 μm, and a porosity of 57% after measurement with a porosimeter.

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Abstract

Disclosed is an organic / inorganic composite porous film comprising: (a) inorganic particles; and (b) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles, wherein the inorganic particles are interconnected among themselves and are fixed by the binder polymer, and interstitial volumes among the inorganic particles form a micropore 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.

Description

technical field [0001] The present invention relates to a novel organic / inorganic composite porous film which exhibits excellent thermal safety and lithium-ion conductivity as well as a high degree of electrolyte swelling compared with conventional polyolefin-based separators, and relates to electrochemical A device that ensures safety and has improved performance. 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 the greatest 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14
CPCY02E60/10H01M10/052H01M50/449H01M50/446H01M50/411
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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