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Organic/inorganic composite porous layer-coated electrode and electrochemical device comprising the same

An inorganic composite and electrochemical technology, applied in the field of electrodes, can solve the problems of inability to provide mechanical properties, easy destruction of chemical structure, uneven selection of calorific value time, etc., to achieve the effects of improving mechanical properties, firm physical bonding, and preventing short circuits

Inactive Publication Date: 2007-02-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, safety mechanisms based on electrolyte additives have drawbacks: their calorific value (J) varies with charging current and internal resistance of the battery and the timing is not uniform
However, Creavis' composite separators do not offer excellent mechanical properties due to the fundamental properties of their nonwoven webs
Moreover, because the chemical structure of polyester is easily destroyed in the electrochemical reaction, the Creavis composite separator will have many difficulties when it is actually applied to the battery ["Desalination"-vol.146, p.23(2002)]

Method used

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  • Organic/inorganic composite porous layer-coated electrode and electrochemical device comprising the same
  • Organic/inorganic composite porous layer-coated electrode and electrochemical device comprising the same
  • Organic/inorganic composite porous layer-coated electrode and electrochemical device comprising the same

Examples

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Embodiment 1

[0093] Example 1. Preparation of an electrode coated with an organic / inorganic composite porous coating and a lithium secondary battery comprising the electrode

[0094] 1-1. Electrode with organic / inorganic composite porous coating (PVdF-CTFE / Al 2 o 3 )

[0095] (Preparation of anode)

[0096] With N-methyl-2-pyrrolidone (NMP) as solvent, add 96wt% carbon powder as anode active material, 3wt% PVDF (polyvinylidene fluoride) as binder and 1wt% carbon black as conductive agent , forming an anode mixed slurry. The slurry was coated on a 10 μm thick copper foil as an anode current collector, and then dried to form an anode. The anode is then rolled.

[0097] (Preparation of cathode)

[0098] With N-methyl-2-pyrrolidone (NMP) as solvent, 92wt% lithium cobalt composite oxide (LiCoO 2 ), 4wt% carbon black as a conductive agent and 4wt% PVDF (polyvinylidene fluoride) as a binder to form a cathode slurry. The slurry was coated on a 20 μm thick aluminum foil as a cathode current...

Embodiment 2

[0104] In addition to using BaTiO3 powder instead of alumina (Al 2 o 3 ) powder as the inorganic particle in the coating material of electrode surface, repeat embodiment 1 to provide to have organic / inorganic composite porous coating (PVdF-CTFE / BaTiO 3 ) electrodes and lithium secondary batteries.

Embodiment 3

[0106] In addition to replacing alumina (Al 2 o 3 ) powder as the inorganic particle in the coating material of electrode surface, repeat embodiment 1 to provide electrode and lithium secondary battery with organic / inorganic composite porous coating (PVdF-CTFE / PMN-PT).

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Abstract

Disclosed is an electrode comprising a first organic / inorganic composite porous coating layer formed on its surface, wherein the first coating layer includes inorganic particles and a binder polymer for interconnecting and fixing the inorganic particles, and has micropores formed by interstitial volumes among the inorganic particles. An electrochemical device including the same electrode is also disclosed. Further, disclosed is a method for manufacturing an electrode having an organic / inorganic composite porous coating layer on the surface thereof, comprising the steps of: (a) coating a current collector with slurry containing an electrode active material and drying it to provide an electrode; and (b) coating the surface of electrode obtained from step (a) with a mixture of inorganic particles with a binder polymer. A lithium secondary battery including the electrode shows improved safety and minimized degradation in battery performance.

Description

technical field [0001] The present invention relates to an electrode that can improve the performance and safety of electrochemical devices. More particularly, it relates to an electrode having a coating that can replace a separator, a method of making the electrode, and an electrochemical device containing the electrode. Background technique [0002] Recently, interest in energy storage technology is increasing. Batteries have been widely used as power sources for portable phones, video cameras, notebook computers, personal computers, and electric vehicles, leading to intensified research and development on them. For this reason, electrochemical devices have attracted great interest. More specifically, rechargeable secondary batteries are the focus of attention. Recently, a great deal of research and development of new electrodes and batteries that can improve capacity density and specific energy has been conducted in the field of secondary batteries. [0003] Among the...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/13
CPCY02E60/12Y02E60/10
Inventor 龙贤姮李相英金锡九安谆昊
Owner LG CHEM LTD
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