Electrode for electrochemical device and method for manufacturing electrode
First Claim
1. An electrode for an electrochemical device, comprising:
- an electrode current collector and an electrode active material layer formed on at least one surface of the electrode current collector,wherein the electrode active material layer includes an electrode active material and has porosity of from 20% to 55%, andthe electrode active material layer has a layered structure in which a plurality of active material sublayers is stacked on one another, with a barrier layer including polymer resin between each active material sublayer,wherein the electrode active material layer increases in porosity at least one of stepwise or gradually from a surface of the electrode current collector along a thickness direction of the electrode active material layer.
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Abstract
The present invention relates to an electrode for an electrochemical device and a method for manufacturing the same. More specifically, the present invention relates to an electrode for an electrochemical device having excellent electrolyte impregnation and improved battery output and lifecycle properties, and a method for manufacturing the electrode. The electrode according to the present invention enables an electrolyte to easily permeate into the electrode, thereby remarkably improving a lifecycle property or an output property due to high electrolyte impregnation. In addition, the method for manufacturing an electrode, according to the present invention, does not cause the deterioration of porosity of a lower electrode active material monolayer, the deterioration being caused by a step performed during the formation of an upper electrode active material monolayer.
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Citations
16 Claims
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1. An electrode for an electrochemical device, comprising:
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an electrode current collector and an electrode active material layer formed on at least one surface of the electrode current collector, wherein the electrode active material layer includes an electrode active material and has porosity of from 20% to 55%, and the electrode active material layer has a layered structure in which a plurality of active material sublayers is stacked on one another, with a barrier layer including polymer resin between each active material sublayer, wherein the electrode active material layer increases in porosity at least one of stepwise or gradually from a surface of the electrode current collector along a thickness direction of the electrode active material layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification