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Electrode including porous coating layer, method for manufacturing same, and electrochemical device including same

一种多孔涂层、制造方法的技术，应用在具有多孔涂层的电极、其制造和包括其的电化学器件领域，能够解决密度降低、表面粗糙等问题，达到良好品质、有助于安全性的效果

Active Publication Date: 2014-05-28
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still has the problem of a decrease in density caused by the coating solvent and a rough surface formed

Method used

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  • Electrode including porous coating layer, method for manufacturing same, and electrochemical device including same
  • Electrode including porous coating layer, method for manufacturing same, and electrochemical device including same
  • Electrode including porous coating layer, method for manufacturing same, and electrochemical device including same

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Embodiment 1

[0075] Embodiment 1: After the anode active material particle slurry and the inorganic particle slurry are applied, electrode

[0076] A first binder polymer was prepared by mixing styrene butadiene rubber (SBR) and carboxymethyl cellulose (CMC) in a weight ratio of 2:1, and the first binder polymer was added as the first solvent in water and dissolved to obtain a binder solution. Graphite as anode active material particles and Super-P (Super-P) as a conductive material were mixed into a binder solution to obtain an anode active material particle aqueous slurry.

[0077] Meanwhile, a second binder polymer was prepared by mixing styrene butadiene rubber (SBR) and carboxymethylcellulose (CMC) at a weight ratio of 2:1, and the second binder polymer was added to water as a second solvent and solvent to obtain an aqueous solution. Will be made of alumina (Al 2 o 3 ) and barium titanate (BaTiO 3 ) were dispersed at a weight ratio of 9:1 to prepare inorganic particles to obt...

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Abstract

The present invention relates to an electrode provided with a porous coating layer having a thickness deviation represented by formula 1 below, and to a method for manufacturing same, wherein the electrode comprises: a collector; an electrode active material layer formed on at least one surface of the collector, and including a composition consisting of electrode active material particles and a first binder polymer; and a composition consisting of inorganic particles and a second binder polymer, which is formed on the surface of the electrode active material layer. [Formula 1]: (Tmax-Tmin) / Tavg <= 0.35. In formula 1, when sections of the porous coating layer are observed using an electron microscope, Tmax is the maximum thickness of the porous coating layer formed on the surface of the electrode active material layer, Tmin is the minimum thickness of the porous coating layer, and Tavg is the average thickness of the coating layer. The present invention enables the manufacture of an electrode using a method for simultaneously drying the electrode active material layer and the porous coating layer, and prevents the binder polymer of the porous coating layer from infiltrating the electrode active material layer so as to impart excellent quality to the electrode. Further, the uniform formation of the porous coating layer contributes to the stability of a battery.

Description

technical field [0001] The present invention relates to an electrode with a porous coating that can replace a diaphragm, a method for its manufacture, and an electrochemical device comprising the same. [0002] This application claims priority from Patent Application No. 10-2012-0037356 filed in Korea on April 10, 2012, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, there has been a growing interest in energy storage technologies. Electrochemical devices have been widely used as energy sources in the fields of mobile phones, video cameras, notebook computers, personal computers, and electric vehicles, resulting in intensive research and development. In this regard, electrochemical devices are one of the subjects of great interest. In particular, the development of rechargeable secondary batteries has been the focus of attention. Recently, research and development of such batteries has focused on designing new electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/66H01M4/36H01M4/139
CPCH01M4/0404H01M4/366H01M2004/021H01M4/36H01M4/622H01M4/139H01M4/13Y02E60/122H01M4/66H01M4/133Y02P70/50Y02E60/10H01M50/446H01M50/46
Inventor 李柱成金钟勋河廷玟陈善美柳宝炅金阵宇
Owner LG ENERGY SOLUTION LTD
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