Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cathode for secondary battery and secondary battery comprising same

A secondary battery and positive electrode technology, which is applied in the direction of secondary batteries, battery electrodes, electrode collector coatings, etc., can solve the problems of lower output characteristics, reduce the probability of conductive agent contact, etc., and achieve the effect of improving output characteristics

Active Publication Date: 2018-05-11
LG ENERGY SOLUTION LTD
View PDF4 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the method of simply reducing the amount of the conductive agent may significantly reduce the probability of contact between the conductive agent and the positive electrode active material present on the surface of the positive electrode, the output characteristics may instead decrease

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cathode for secondary battery and secondary battery comprising same
  • Cathode for secondary battery and secondary battery comprising same
  • Cathode for secondary battery and secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0113] image 3 is a flowchart schematically showing a method of producing a positive electrode for a secondary battery according to an embodiment of the present invention. image 3 It is just an example for illustrating the present invention, and the present invention is not limited thereto. In the following, reference will be made to image 3 Each step is explained.

[0114] First, step 1 for preparing a positive electrode for a secondary battery is a step ( S1 ) of preparing a composition for forming a conductive layer.

[0115] The composition for forming the conductive layer can be prepared by adding carbon nanotubes to the dispersion medium, wherein specifically, in order not to mix the carbon nanotubes in the dispersion medium, but to make the carbon nanotubes on the surface of the dispersion medium A three-dimensional porous network structure layer is formed on the conductive layer, the second carbon nanotubes are gradually dropped on the dispersion medium, and then th...

Embodiment 1

[0153] (Preparation of positive electrode active material)

[0154] Will Li(Ni 0.6 mn 0.2 co 0.2 )O 2 Cathode active material (D 50 =11 μm), the first carbon nanotube (bundled carbon nanotube with the following specifications: monomer length: 3 μm, diameter: 10 nm, specific surface area: 300 m 2 / g, and bulk density: 0.13kg / m 3 ) and PVdF binder are mixed in N-methylpyrrolidone solvent in a weight ratio of 98.02:0.4:1.58 to prepare a composition for forming a positive electrode (viscosity: 5000mPa·s), and use the composition to collect aluminum Electric Appliance Coating was performed and dried at 130° C. to prepare a positive electrode assembly (porosity of the positive electrode active material layer: 30% by volume).

[0155] (Preparation of composition for forming conductive layer)

[0156] With 0.05g of the second carbon nanotubes (bundled carbon nanotubes with the following specifications: monomer length: 5 μm, diameter: 10nm, specific surface area: 300m 2 / g, and b...

Embodiment 2

[0160] In addition to using Li(Ni 0.6 mn 0.2 co 0.2 )O 2 Cathode active material (D 50 =11 μm), the first carbon nanotube (bundled carbon nanotube with the following specifications: monomer length: 3 μm, diameter: 10 nm, specific surface area: 300 m 2 / g, and bulk density: 0.13kg / m 3 ) and PVdF binder mixed in N-methylpyrrolidone solvent in a weight ratio of 98.26:0.2:1.54 except for the composition (viscosity: 5000mPa·s) for forming the positive electrode, the same as in Example 1 Positive electrode was prepared in the same way (the thickness ratio=1:0.002 of the positive electrode active material layer to the conductive layer, the porosity=30 volume % in the active material layer, the porosity=56 volume % of the conductive layer, and the first carbon nanotube: The weight ratio of the second carbon nanotubes = 1:0.34) (see Table 1 below).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
porosityaaaaaaaaaa
porosityaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The present invention provides a cathode for a secondary battery and a secondary battery comprising the same, wherein the cathode for a secondary battery comprises: a cathode current collector; a porous cathode active material layer positioned on the surface of the cathode current collector and comprising a cathode active material and a first carbon nanotube; and a conductive layer on which the cathode active material layer is positioned on the surface thereof, wherein the conductive layer comprises a porous network structure formed by a plurality of second carbon nanotubes and the porosity ofthe cathode active material layer is a porosity of +10 volume% or more. The cathode for a secondary battery according to the present invention forms an electrical network inside and across the surface of the cathode active material layer by using carbon nanotubes having strength properties as well as excellent electrical conductivity, such that it is possible to keep material resistance in the active material layer low while greatly reducing charge transfer resistance whereby the output properties of the battery can be remarkably improved.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2015-0169150 filed on November 30, 2015 and Korean Patent Application No. 10-2016-0161525 filed on November 30, 2016 at the Korean Intellectual Property Office, and is adopted by The entire disclosure content thereof is incorporated herein by reference. technical field [0003] The present invention relates to a positive electrode for a secondary battery that can improve output characteristics of a battery by reducing charge transfer resistance by forming a conductive network throughout the positive electrode, and a secondary battery including the same. Background technique [0004] With the technological development of mobile devices and the increase in demand therefor, the demand for secondary batteries as energy sources has significantly increased. Among these secondary batteries, lithium secondary batteries having high ene...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M2/10H01M10/052
CPCH01M2004/021C01B32/158B82Y30/00H01M4/0404H01M4/0416H01M4/131H01M4/1391H01M4/366H01M4/625Y10S977/742Y10S977/842Y10S977/948Y02E60/10H01M4/13H01M10/052H01M2220/20H01M50/20H01M4/139H01M4/0402H01M2220/30Y02T10/70B82Y40/00H01M4/364H01M4/505H01M4/525H01M10/0525H01M2004/028
Inventor 崔宁根金孝植白株烈吴松泽
Owner LG ENERGY SOLUTION LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com