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Cathode slurry composition, secondary battery cathode comprising same, and lithium secondary battery

A lithium secondary battery and positive electrode slurry technology, which is applied in secondary batteries, secondary battery manufacturing, secondary battery repair/maintenance, etc., can solve problems such as thermal, mechanical shock and electrical shock instability, explosion, etc., to achieve Effect of Suppressing Interface Resistance

Active Publication Date: 2019-09-10
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Lithium-ion batteries have the advantage of high capacity, however, since lithium-ion batteries are unstable to heat, mechanical shocks, and electrical shocks, there is a concern that they may explode due to ignition or heat release depending on the environment in which they are used

Method used

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  • Cathode slurry composition, secondary battery cathode comprising same, and lithium secondary battery
  • Cathode slurry composition, secondary battery cathode comprising same, and lithium secondary battery
  • Cathode slurry composition, secondary battery cathode comprising same, and lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0199] (cathode preparation)

[0200] 1.2 g of polyvinylidene fluoride (PVDF) as a fluoropolymer was added to 30 g of N-methyl-2-pyrrolidone (NMP) to prepare a fluoropolymer solution.

[0201] Subsequently, 0.5 g of an oligomer (weight average molecular weight: 230,000, m1:n1=5:2) containing a unit represented by Formula 1a was added to the fluoropolymer solution to prepare a mixed solution.

[0202] 97.3g positive electrode active material (LiCoO 2 ) and 1.0 g of carbon black as a conductive agent were added to the mixed solution to prepare a positive electrode slurry composition (solid content of 65% by weight).

[0203] Subsequently, a positive electrode current collector (Al foil, Al foil) with a thickness of 10 μm was coated with the positive electrode active slurry composition, dried and rolled to prepare a positive electrode.

[0204] (Negative Electrode Preparation)

[0205] Artificial graphite as negative electrode active material, carbon black (carbon black) as co...

Embodiment 2

[0213] A positive electrode and a lithium secondary battery comprising the positive electrode were prepared in the same manner as in Example 1, except that 0.3 g of an oligomer (weight-average molecular weight: 230,000, m1:n1= 5:2), and 97.5g of positive electrode active material was added.

Embodiment 3

[0215] A positive electrode and a lithium secondary battery comprising the positive electrode were prepared in the same manner as in Example 1, except that an oligomer containing a unit represented by formula 1b (weight average molecular weight: 260,000, m2:n2=5: 2) Instead of oligomers containing units represented by formula 1a.

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Abstract

The present invention relates to a cathode slurry composition, a secondary battery cathode comprising the same, and a lithium secondary battery and, specifically, to: a cathode slurry composition comprising a cathode active material, a fluorine-containing polymer, a conductive material, a solvent, and a polymer or oligomer comprising a unit represented by chemical formula 1; a lithium secondary battery cathode comprising the same; and a lithium secondary battery.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2017-0151249 filed with the Korean Intellectual Property Office on November 14, 2017 and Korean Patent Application No. 2018-0136835 filed with the Korean Intellectual Property Office on November 8, 2018 rights and interests, the disclosure of the above patent application is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to a positive electrode slurry composition, and a positive electrode for a lithium secondary battery and a lithium secondary battery comprising the positive electrode slurry composition. Background technique [0004] Recently, with the rapid development of electrical, electronic, communication, and computer industries, the demand for high-performance and high-stability batteries, which are key components in these industries, has gradually increased. [0005] As batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/42H01M4/139H01M4/04H01M10/04
CPCH01M4/13H01M4/139H01M4/622H01M4/623H01M10/0525Y02E60/10Y02P70/50H01M4/366H01M50/461H01M4/0404H01M4/0435H01M4/0471H01M4/62H01M4/625H01M10/049H01M10/052H01M10/4235C08K3/013C08K3/04C08K2201/001C08L27/16C08L29/10C08L2201/56H01M4/1391H01M2004/028
Inventor 李柱成薛云峰高明秀昌仁聲
Owner LG ENERGY SOLUTION LTD
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