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Positive electrode slurry comprising oxalic acid, method for manufacturing same, positive electrode for secondary battery, and secondary battery

A technology for positive electrode slurry and lithium secondary batteries, which can be used in secondary batteries, secondary battery repair/maintenance, battery electrodes, etc., and can solve problems such as phase stability reduction

Active Publication Date: 2020-09-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, with the Co-based cathode material LiCoO 2 Compared with nickel-rich lithium transition metal oxides, there is a problem that the phase stability of the slurry is reduced
Therefore, there are many difficulties in slurry mixing conditions or slurry management

Method used

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  • Positive electrode slurry comprising oxalic acid, method for manufacturing same, positive electrode for secondary battery, and secondary battery
  • Positive electrode slurry comprising oxalic acid, method for manufacturing same, positive electrode for secondary battery, and secondary battery
  • Positive electrode slurry comprising oxalic acid, method for manufacturing same, positive electrode for secondary battery, and secondary battery

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Experimental program
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preparation example Construction

[0078] Another embodiment of the present invention provides a method for preparing positive electrode slurry, the method comprising:

[0079] (a) a process of adding a positive electrode active material, a conductive material, and a binder to a solvent, and then mixing them with each other to prepare a mixture; and

[0080] (b) adding oxalic acid and an overcharge inhibitor to the mixture, and then mixing them with each other to prepare a positive electrode slurry; wherein, the positive electrode active material, conductive material and binder based on 100 parts by weight of the positive electrode slurry The total solid content of the overcharge inhibitor is 1 to 2 parts by weight, and the total solid content of the positive electrode active material, conductive material and binder based on 100 parts by weight of the positive electrode slurry, the addition amount of oxalic acid 0.1 to 0.7 parts by weight.

[0081] Here, descriptions of the positive electrode active material, ...

experiment example 1

[0114] Dissolution tests were performed by changing the concentration of oxalic acid (weight of oxalic acid / weight of solution x 100) to 20% and 25% while dissolving oxalic acid in NMP (N-methylpyrrolidone), as figure 1 shown.

[0115] refer to figure 1 , complete dissolution was observed at a concentration of 20%, while at a concentration of 25% oxalic acid reached saturation and did not dissolve further, resulting in precipitation.

[0116] Therefore, in the present invention, an oxalic acid solution with a concentration of 20% is used.

experiment example 2

[0118] Add 96.865% by weight of active material LiNi in a weight ratio of 80:20 0.8 mn 0.1 co 0.1 o 2 and the active material LiNiO 2 active material, 1.9% by weight of carbon black as a conductive material (predispersed solution (16% solution of carbon black in NMP)), 1.235% by weight of PVDF as a binder (PVDF solution (PVDF in NMP 6% solution)) and mixed using a BTM mixer (INOUE Inc., 5 L volume, three-shaft mixer with a total of three blades including one low speed blade and two high speed blades)).

[0119] Mixtures were prepared as samples at 25°C and 60°C, respectively.

[0120] The oxalic acid solution (20% concentration) of Experimental Example 1 was mixed with each of the two mixtures using a homogenizing dispersing mixer (PRIMIX Corp., 500 ml volume, a high-speed dispersing machine), so that based on the active material, conductive material and The total weight of the binder, the amount of oxalic acid is 0.5 parts by weight, after that, 3 parts by weight (excess...

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Abstract

The present invention provides a positive electrode slurry for manufacturing a positive electrode for a lithium secondary battery, a method for manufacturing the positive electrode slurry, a positiveelectrode for a secondary battery, and a secondary battery, the positive electrode slurry comprising a positive electrode active material, a conductive material, a binder, an overcharge prevention agent, oxalic acid, and a solvent, wherein 1 to 2 parts by weight of the overcharge prevention agent is included when the total solids weight of the positive electrode active material, conductive material, and binder of the positive electrode slurry is 100, 0.1 to 0.7 parts by weight of oxalic acid is included when the total solids weight of the positive electrode active material, conductive material, and binder of the positive electrode slurry is 100, and the positive electrode slurry has a viscosity of 4000 to 15000 cp at room temperature.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Applications No. 10-2018-0169827 and No. 10-2019-0159241 filed on December 26, 2018 and December 3, 2019, respectively, the disclosure of which is hereby incorporated by reference Incorporated herein in its entirety. [0003] The present invention relates to a positive electrode slurry containing oxalic acid, a preparation method thereof, a positive electrode for a secondary battery, and a secondary battery. Background technique [0004] The rapid increase in the use of fossil fuels has led to an increase in the need to use alternative or clean energy sources. As part of this need, the most actively researched area is electrochemistry-based power generation / storage applications. [0005] Currently, a representative example of an electrochemical device using the above electrochemical energy may be a secondary battery, and its applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/62H01M10/42H01M4/525H01M4/1391H01M10/052
CPCY02E60/10H01M4/131H01M4/1391H01M4/525H01M10/052H01M2004/028H01M4/628H01M10/4235H01M4/505H01M4/362H01M4/62H01M4/04H01M10/0525
Inventor 朴尚浩沈慧琳金佑河崔相勋
Owner LG ENERGY SOLUTION LTD
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