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Paper current collector, method for manufacturing same, and electrochemical device comprising paper current collector

A current collector and paper-based technology, applied in electrochemical generators, final product manufacturing, electrode carriers/collectors, etc., can solve difficult problems and achieve excellent mechanical flexibility, high energy density, and light weight

Inactive Publication Date: 2019-07-23
大韩民国(山林厅国立山林科学院长)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is very difficult to develop a material that satisfies all requirements for electrical properties and transparency due to the contradictory nature of the material's transparency and electrical properties such as conductivity.

Method used

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  • Paper current collector, method for manufacturing same, and electrochemical device comprising paper current collector
  • Paper current collector, method for manufacturing same, and electrochemical device comprising paper current collector
  • Paper current collector, method for manufacturing same, and electrochemical device comprising paper current collector

Examples

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Effect test

preparation example 1

[0063] A suspension having a cellulose concentration of 0.5% obtained by adding cellulose fibers to water was stirred by using a stirrer for 20 minutes, and the suspension was passed through a nozzle 20 having a diameter of 50-200 μm under a pressure of 20000 psi using a homogenizer times to prepare a dispersion in which nanocellulose fibers with a diameter of 10-100 nm are dispersed.

Embodiment 1

[0065] Nanocellulose paper was produced by placing the dispersion prepared in Preparation Example 1 at a continuous electrospinning nozzle of an electrospinning device for electrospinning. Here, the input voltage is controlled at 20±1kV, and the spinning speed is 20ml / hr per unit area (1cm 2 ) spinning 1 ml of spinning solution. Then, the isopropanol solution in which 1 wt% Ag nanowires were dispersed was placed at the continuous electrospinning nozzle, and electrospinning was performed on the fabricated nanocellulose paper to fabricate a paper current collector. Here, the input voltage is controlled at 15±1kV, and the spinning speed per unit area (1cm 2 ) spinning 0.5ml of spinning solution, and based on 100 parts by weight of nanocellulose paper, the content of the Ag nanowire layer included in the paper current collector is 10±5 parts by weight.

Embodiment 2

[0067] Using the dispersion liquid prepared in Preparation Example 1, nanocellulose paper was produced by the same method as in Example 1. Then, the isopropanol solution dispersed with 1 wt% Ag nanowires was injected into the first nozzle of the dual electrospinning device, and the aqueous solution dispersed with 0.01 wt% carbon nanotubes was injected into the second nozzle, and the Double electrospinning was performed on prefabricated nanocellulose paper to manufacture a paper current collector in which a first conductive layer including a first conductive material and a second conductive layer including a second conductive material were sequentially stacked. Here, the input voltages of the first nozzle and the second nozzle are controlled at 15±1kV and 18±1kV respectively, and the spinning speeds are 20±1ml / hr and 10±1ml / hr, and each unit area (1cm 2) The spinning amount is controlled at 0.5ml. In addition, based on 100 parts by weight of nanocellulose paper, the respective...

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Abstract

The present invention relates to a paper current collector, a method for manufacturing same, and an electrochemical device comprising a paper current collector. The paper current collector, accordingto the present invention, is provided with, on top of a fiber layer containing the nanocellulose fiber, conductive layers comprising a conductive material forming a conductive network with the nanocellulose fiber, and thereby provides the advantages of being lightweight, allowing high energy density for an electrode when manufacturing the electrode, having excellent mechanical flexibility, and ofsecuring electrical physical properties and transparency of the material.

Description

technical field [0001] The present invention relates to a paper current collector, its manufacturing method and an electrochemical device comprising it. Background technique [0002] In recent years, with the increasing importance of flexible electrochemical devices (such as flexible lithium-ion batteries) for various designs such as roll-up displays and wearable electronic devices, and the increasing requirements for design diversity, the formation of flexible electrochemical devices Flexible materials have received increasing attention. [0003] For example, Korean Laid-Open Patent Publication No. 2015-0131505 discloses a lithium ion secondary battery manufactured by sequentially stacking a positive electrode, a separator, and a negative electrode in a case and injecting an electrolyte thereinto. However, due to the lack of physical flexibility of batteries with such structures, there are many limitations in satisfying the design versatility required for flexible electroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/74H01M4/13H01M10/0525
CPCH01M4/667H01M10/0525Y02E60/10H01M4/663H01M4/661H01M4/13H01M4/74Y02P70/50D01D5/003H01M4/72
Inventor 李宣永李相英金正焕全祥镇朴相范崔惇厦
Owner 大韩民国(山林厅国立山林科学院长)
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