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Electrode and secondary battery comprising same

An electrode and electrode active material technology, applied in secondary batteries, non-aqueous electrolyte batteries, positive electrodes, etc., can solve the problems of electrolyte mobility limitation, battery efficiency reduction, incompatibility, etc., to achieve excellent electrical conductivity, improve lifespan characteristics, the effect of suppressing the decrease in conductivity

Pending Publication Date: 2022-01-07
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, for multi-walled carbon nanotubes, because they are cut into too short lengths during the preparation of the dispersion due to the structure formed by the growth of nodes as units, there is a limit to the improvement of the conductivity of the electrode.
[0009] For planar conductive agents such as graphene, even though the conductivity is excellent, it is difficult to prepare thin single layer graphene, and in the case of using thick graphene, cell efficiency decreases
Furthermore, for planar conductive agents, the mobility of the electrolyte in the battery would be limited due to the broad planar contacts
In addition, since graphene mainly exists in the form of covering the surface of electrode active materials, it is not suitable for forming long conductive networks between electrode active materials.

Method used

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preparation example Construction

[0072] The preparation method of the electrode of the present invention may comprise the steps of: preparing a graphene dispersion and a carbon nanotube structure dispersion (S1); and forming an electrode slurry comprising a graphene dispersion, a carbon nanotube structure dispersion and an electrode active material (S2).

[0073] (1) Preparation of graphene dispersion and carbon nanotube structure dispersion (S1)

[0074] 1) Preparation of graphene dispersion

[0075] After preparing the mixed solution comprising the graphene of the above-mentioned embodiment, dispersion medium and dispersant, it can be obtained by using homogenizer, bead mill, ball mill, basket mill, attritor, universal mixer, transparent mixer, Nail mill, TK mixer or ultrasonic treatment method to prepare graphene dispersion. Since the dispersion medium and the dispersant may be the same as those used in the preparation of the carbon nanotube structure dispersion described later, the dispersion medium and...

preparation example 1

[0108] Preparation Example 1: Preparation of Graphene Dispersion

[0109] 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

[0110] Preparation Example 2: Preparation of Carbon Nanotube Structure Dispersion

[0111] 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.

[0112] By stirring the mixture by a bead-mill method, bundle-type single-walled carbon nanotubes were dispersed in a solvent, and thus a carbon nanotube structure dispersion was prepared. 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 connected side by side (see figure 2 A).

[0113] In the carbon nanotube structure dispersi...

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Abstract

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

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0122965 filed on October 4, 2019, the disclosure of which is incorporated herein by reference. [0003] The present invention relates to an electrode comprising an electrode active material layer comprising an electrode active material and a conductive agent, wherein the conductive agent comprises graphene and 2 to 5,000 of them, and a secondary battery comprising the electrode. A carbon nanotube structure in which single-walled carbon nanotube units are combined with each other, and 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 development of technology and the recent increase in demand for mobile devices, demands for batteries as energy sources have remarkably increased, and various studies on batteries capable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M10/0525
CPCH01M4/625H01M4/131H01M10/0525H01M2004/028Y02E60/10H01M4/13H01M10/052H01M2004/021
Inventor 金泰坤朴信英李宝蓝曺炯万柳泰求郭玟
Owner LG ENERGY SOLUTION LTD
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