Electrode and secondary battery including the same

A technology of electrodes and electrode active materials, applied in the field of secondary batteries, can solve problems such as easy damage of electrode active materials, reduced battery efficiency, difficulty in producing graphene, etc.

Pending Publication Date: 2022-03-01
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the structure formed by growing with nodes, the multi-walled carbon nanotubes are cut into too short lengths during the preparation of the dispersion, thus there is a limitation in improving the conductivity of the electrode.
[0009] Meanwhile, planar conductive agents such as graphene also have excellent conductivity, but there is a limitation that it is difficult to produce graphene with a thinner thickness of a single layer, and if graphite with a thicker thickness is used ene, the battery efficiency decreases
Furthermore, in the case of planar conductive agents, there is a limitation that the mobility of the electrolyte in the battery is limited due to the broad planar contacts
In addition, graphene mainly exists in the form of covering the surface of electrode active materials, so it is not suitable for forming long conductive networks between electrode active materials.
[0010] In addition, when using a linear conductive agent or a planar conductive agent, there is a limitation that the electrode active material is easily damaged during the process of winding the electrode

Method used

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  • Electrode and secondary battery including the same
  • Electrode and secondary battery including the same
  • Electrode and secondary battery including the same

Examples

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preparation example Construction

[0075] 1) Preparation of graphene dispersion

[0076] After preparing the mixed solution comprising the graphene of the above-mentioned embodiment, dispersion medium and dispersant, it can be passed through such as homogenizer, bead mill, ball mill, basket mill, attritor, general mixer, transparent mixer, Nail mill, TK mixer and ultrasonic dispersion method to prepare graphene dispersion. The dispersion medium and dispersant may be the same as those used in the preparation of the carbon nanotube structure dispersion to be described below, and thus will be described below.

[0077] 2) Preparation of carbon black dispersion

[0078] After preparing the mixed solution comprising the carbon black of the above-mentioned embodiment, the dispersion medium and the dispersant, it can be passed through such as homogenizer, bead mill, ball mill, basket mill, attritor, universal mixer, transparent mixer, Nail mill, TK mixer and ultrasonic dispersion method to prepare carbon black disper...

preparation example 1

[0111] Preparation Example 1: Preparation of Graphene Dispersion

[0112] Chemically expanded graphene (powder form), hydrogenated nitrile rubber (H-NBR) as a dispersant, and N-methylpyrrolidone (NMP, N-methylpyrrolidone) as a dispersion medium in a weight ratio of 3.6:1.2:95.2 Mix to form a mixture. This mixture was fed into a pin mill in which 80% was filled with beads having a diameter of 0.65 mm, dispersed and discharged at a discharge rate of 2 kg / min. By performing this procedure twice, the chemically expanded graphene is completely dispersed to prepare a graphene dispersion (see image 3 ).

preparation example 2

[0113] Preparation Example 2: Preparation of Carbon Nanotube Structure Dispersion

[0114] Bundle-type single-walled carbon nanotubes (specific surface area 650m 2 / g) and polyvinylidene fluoride (PVdF, KF9700, weight average molecular weight: 880,000 g / mol) were mixed in N-methylpyrrolidone (N-Methylpyrrolidone: NMP) as a solvent to prepare a solid content of 2.4% by weight mixture.

[0115] The mixture was stirred by a bead-mill method, thereby dispersing bundle-type single-walled carbon nanotubes in a solvent, thereby preparing a carbon nanotube structure dispersion. In this case, the diameter of the beads was 1 mm, the rotation speed of the stirring vessel containing the beads was 3,000 RPM, and stirring was performed for 60 minutes. Dispersions of carbon nanotube structures include carbon nanotube structures in a form in which 2 to 5,000 single-walled carbon nanotube units are bonded side by side (see figure 2 (A)).

[0116] In the carbon nanotube structure dispersio...

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Abstract

The present invention relates to an electrode and a secondary battery comprising the same, the electrode comprising an electrode active material layer, the electrode active material layer comprising an electrode active material and a conductive agent, the conductive agent comprising: graphene; a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other; and carbon black, wherein the carbon nanotube structure is included in the electrode active material layer in an amount of 0.01 wt% to 0.5 wt%.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of priority of Korean Patent Application No. 10-2019-0123261 filed on October 4, 2019, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to an electrode and a secondary battery including the electrode, the electrode includes an electrode active material layer, the electrode active material layer includes an electrode active material and a conductive agent, and the conductive agent includes: graphene; wherein 2 A carbon nanotube structure in which to 5,000 single-walled carbon nanotube units are bonded to each other; and carbon black, wherein the carbon nanotube structure is included in the electrode active material layer in an amount of 0.01 wt % to 0.5 wt %. Background technique [0004] With the recent technological development and increase in demand for mobile devices, demand for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62
CPCH01M4/625H01M4/13H01M10/052C01B32/158H01M2004/021H01M2004/028
Inventor 崔舜炯金容俊金泰坤
Owner LG ENERGY SOLUTION LTD
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