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Cathode slurry composition for secondary battery, cathode for secondary battery produced by using same and secondary battery

A positive electrode slurry and secondary battery technology, which is applied in the direction of secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of insufficient electrochemical properties, deterioration of high temperature characteristics, and decreased battery adhesion, and achieve the best electrochemical properties Effects of minimized deterioration, sufficient dispersibility, and excellent high-temperature storage properties

Active Publication Date: 2020-05-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the case of using the nitrile-based copolymer described in Patent Document 1, the affinity with the electrolyte solution is increased due to the presence of the hydrophilic functional group, and as a result, since the nitrile-based copolymer is exposed to high-temperature conditions during battery operation Battery adhesion decreases while being swollen by the electrolyte solution, so high-temperature characteristics may deteriorate
In addition, in Patent Document 1, a nitrile-based copolymer has been used as an adhesive, but, for the nitrile-based copolymer, since its adhesiveness is lower than that of polyvinylidene fluoride even if a functional group is used, since polyvinylidene fluoride The amount of vinyl fluoride binder is reduced, resulting in a decrease in electrode adhesion, and as a result, the high temperature characteristics are further deteriorated
To solve this limitation, it is necessary to increase the amount of binder, however, in the case of increasing the amount of binder, the amount of positive electrode active material decreases, so the electrochemical properties become insufficient

Method used

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  • Cathode slurry composition for secondary battery, cathode for secondary battery produced by using same and secondary battery
  • Cathode slurry composition for secondary battery, cathode for secondary battery produced by using same and secondary battery
  • Cathode slurry composition for secondary battery, cathode for secondary battery produced by using same and secondary battery

Examples

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preparation example 1

[0121] Acrylonitrile and hydrogenated butadiene are polymerized with a weight ratio of 34:66 of 0.2 parts by weight of nitrile-based copolymer (weight average molecular weight: 220,000g / mol), 2 parts by weight of carbon black (specific surface area: 135m 2 / g), 2 parts by weight of PVdF and 95.8 parts by weight of Li[Ni 0.6 co 0.2 mn 0.2 ]O 2 The positive electrode active materials were mixed, and using N-methylpyrrolidone (NMP) solvent, a positive electrode slurry composition A having a solid content of 72% by weight was prepared.

preparation example 2

[0123] Acrylonitrile and hydrogenated butadiene are polymerized with a weight ratio of 34:66 of 0.08 parts by weight of nitrile-based copolymer (weight average molecular weight: 220,000g / mol), 0.4 parts by weight of carbon nanotubes (specific surface area: 185m 2 / g), 1.5 parts by weight of PVdF and 98.02 parts by weight of Li[Ni 0.6 co 0.2 mn 0.2 ]O 2 The positive electrode active materials were mixed, and using N-methylpyrrolidone (NMP) solvent, a positive electrode slurry composition B having a solid content of 72% by weight was prepared.

preparation example 3

[0125] Acrylonitrile and hydrogenated butadiene are polymerized with 0.08 parts by weight of nitrile copolymer (weight average molecular weight: 310,000g / mol), 0.4 parts by weight of carbon nanotubes (specific surface area: 185m 2 / g), 1.5 parts by weight of PVdF and 98.02 parts by weight of Li[Ni 0.6 co 0.2 mn 0.2 ]O 2 The positive electrode active materials were mixed, and using N-methylpyrrolidone (NMP) solvent, a positive electrode slurry composition C having a solid content of 72% by weight was prepared.

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Abstract

The present invention relates to a cathode slurry composition for a secondary battery. The cathode slurry composition for the secondary battery comprises a cathode active material; a carbon-based conductive material having a specific surface area (BET) of 100 to 200 m2 / g; a binder; and a nitrile-based copolymer which has an electrolyte swelling degree defined by formula (1) below of 200% or lower,and which does not contain a functional group other than a cyano group. The present invention also provides a cathode for the secondary battery produced by using the cathode slurry composition and the secondary battery. In a Formula (1): electrolyte swelling degree (%) = {(W1-W0) / W0}*100, W0 is the initial weight of a polymer film produced from the nitrile-based copolymer, and W1 is the weight ofthe polymer film measured after storing the polymer film in an electrolyte at 60 DEG C for 48 hours.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0158629 and No. 10-2017-0158628 filed with the Korean Intellectual Property Office on November 24, 2017, the disclosures of which are incorporated by reference in their entirety here. [0003] technical field [0004] The present invention relates to a positive electrode slurry composition for a secondary battery, a positive electrode, and a secondary battery, and more particularly, to a positive electrode slurry composition for a secondary battery having excellent high-temperature characteristics and a preparation using the composition positive electrode and lithium secondary battery. Background technique [0005] A positive electrode for a secondary battery is generally prepared by coating a positive electrode current collector with a positive electrode slurry composition including a positive electrode active material, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052
CPCH01M4/13H01M4/62H01M10/052Y02E60/10H01M4/622H01M4/625H01M4/0404H01M4/139H01M2004/028H01M10/4235
Inventor 柳正宇沈慧琳林俊默
Owner LG ENERGY SOLUTION LTD
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