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Organic/Inorganic Composite Electrolyte and Electrochemical Device Prepared Thereby

a technology of composite electrolyte and electrochemical device, which is applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of battery quality degradation and battery energy density drop per unit weigh

Inactive Publication Date: 2010-07-01
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]The inventors of the present invention have found that an organic / inorganic composite porous coating layer, which is formed by coating a mixture of inorganic particles with a polymer capable of being swelled with an electrolyte directly onto the surface of an electrode, can substitute for a conventional separator, and is firmly bound to an interface between the coating layer and an electrode so as to prevent heat shrinking, resulting in improvement in the safety of an electrochemical device.

Problems solved by technology

The inorganic particles may serve as a resistance layer to lithium ion (Li+) movements, resulting in degradation of the quality of a battery due to a drop in lithium ion conductivity.
Additionally, such an increase in the weight of the layer of inorganic particles causes a drop in energy density of a battery per unit weight.

Method used

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  • Organic/Inorganic Composite Electrolyte and Electrochemical Device Prepared Thereby
  • Organic/Inorganic Composite Electrolyte and Electrochemical Device Prepared Thereby
  • Organic/Inorganic Composite Electrolyte and Electrochemical Device Prepared Thereby

Examples

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examples [UNK]

EXAMPLES 1˜3

Example 1

1-1. Preparation of Alumina Porous Inorganic Particles

[0081]Aluminum nitrate, an alumina precursor compound, was dissolved in distilled water as a solvent to a concentration of 0.2M. After aluminum nitrate was completely dissolved in distilled water, preliminarily formed polystyrene beads having a diameter of 100 nm was added to the solution in an amount of 3 parts by weight based on the weight of alumina to be prepared, and the mixture was thoroughly agitated. FIG. 8 is a photographic view of the polystyrene beads taken by SEM. The precursor solution obtained as described above was introduced into a spray pyrolysis system to provide porous alumina inorganic particles. FIGS. 2 and 8 are photographic views of the porous alumina particles taken by SEM.

1-2. Manufacture of Electrode Comprising Organic / Inorganic Composite Porous Coating Layer

[0082]To N-methyl-2-pyrrolidone (NMP) as a solvent, 96 wt % of carbon powder as an anode active material, 3 wt % of PVdF (polyv...

example 2

[0088]Example 1 was repeated to provide an electrode comprising an organic / inorganic composite porous coating layer (PVdF-HFP / porous Al2O3) and a lithium secondary battery using the same, except that PVDF-HFP having a solubility parameter of 22˜30 MPa1 / 2 was used instead of PVDF-CTFE. After measuring the pore size and porosity by using a porosimeter, the organic / inorganic composite porous coating layer formed on the electrode had a pore size of 0.51 μm and a porosity of 62%.

example 3

[0089]Example 1 was repeated to provide an electrode comprising an organic / inorganic composite porous coating layer (PVdF-CTFE / TiO2) and a lithium secondary battery using the same, except that porous Al2O3 powder was substituted with porous TiO2 powder having the same pore size and porosity as porous Al2O3 powder. After measuring the pore size and porosity by using a porosimeter, the organic / inorganic composite porous coating layer formed on the electrode had a pore size of 0.37 μm and a porosity of 65%.

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Abstract

Disclosed is an electrode whose surface includes an organic / inorganic composite porous coating layer comprising porous inorganic particles and a binder polymer, wherein the porous inorganic particles have pores having such a size that lithium ions (Li+) solvated in an electrolyte solvent can pass therethrough. A method for manufacturing the electrode and an electrochemical device using the electrode are also disclosed. The organic / inorganic composite porous coating layer formed on the electrode according to the present invention provides an additional pathway for lithium ion conduction due to a plurality of pore structures present in the porous inorganic particles. Thus, when the organic / inorganic composite porous coating layer is used instead of a conventional polymer-based separator in a battery, the battery can provide improved quality and an increased energy density per unit weight due to a reduced weight of the organic / inorganic composite porous coating layer.

Description

TECHNICAL FIELD[0001]The present invention relates to an electrode that comprises a coating layer capable of substituting for a separator and ensures improved quality and safety of an electrochemical device, a method for manufacturing the same, and an electrochemical device comprising the same.BACKGROUND ART[0002]Recently, there is increasing interest in energy storage technology. Batteries have been widely used as energy sources in portable phones, camcorders, notebook computers, PCs and electric cars, resulting in intensive research and development into them. In this regard, electrochemical devices are subjects of great interest. Particularly, development of rechargeable secondary batteries has been the focus of attention.[0003]Among the currently used secondary batteries, lithium secondary batteries, developed in early 1990's, have drive voltage and energy density higher than those of conventional batteries using aqueous electrolytes (such as Ni-MH batteries, Ni—Cd batteries and ...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/04H01M4/13H01M4/131H01M4/139H01M4/1391H01M10/052H01M10/36
CPCH01M2/1673H01M4/0402H01M4/13H01M4/131H01M4/139H01M4/1391H01M10/052H01M10/4235H01M2004/021Y02E60/122Y02P70/54H01M50/46Y02E60/10Y02P70/50
Inventor SEO, DAE-JONGLEE, SANG-YOUNGKIM, SEOK-KOOHONG, JANG-HYUK
Owner LG CHEM LTD
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