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Compound for positive electrode

A compound and positive electrode technology, applied in the field of positive electrode compounds, can solve problems such as hindering battery performance and hindering capacitance retention rate, and achieve the effect of improving average compressive strength and excellent capacitance retention rate

Pending Publication Date: 2020-10-30
TANAKA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phosphorus sometimes hinders the improvement of battery performance, especially the capacity retention rate. Therefore, in Patent Document 2, there is still room for improvement in the capacity retention rate after being placed at a high temperature.

Method used

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Examples

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Embodiment

[0069] Next, examples of the present invention will be described, but the present invention is not limited to the above examples unless the gist of the present invention is exceeded.

[0070] The manufacture method of the positive electrode compound of Examples 1-3

[0071] Preparation of Nickel Composite Hydroxide Particles

[0072] In a reaction tank equipped with a stirrer, ammonium sulfate aqueous solution and hydroxide Sodium aqueous solution, in a reaction tank with a reaction volume of 500 L, while maintaining the reaction temperature at 45.0° C. and maintaining the reaction pH at 12.1 on the basis of the liquid temperature of 40° C., using a propeller stirrer with a stirring blade of 250 mm at 520 rpm The stirring speed is continuously stirred. The generated hydroxide was taken out by overflowing the overflow pipe of the reaction tank. Each treatment of washing with water, dehydration, and drying was performed on the hydroxide taken out, thereby obtaining nickel com...

Embodiment 4

[0113] The manufacture method of the positive electrode compound of embodiment 4

[0114] The nickel composite hydroxide particle of comparative example 6 prepared in the above manner is further directly implemented electroless pure nickel plating treatment, thus manufactures embodiment 4, has the nickel composite hydroxide (with nickel plating film as cladding layer) Nickel-plated film as the coating layer of nickel-cobalt-manganese composite hydroxide), that is, nickel-coated nickel composite hydroxide. More specifically, nickel composite hydroxide having a nickel-plated film was produced as follows.

[0115] First, nickel composite hydroxide particles having a particle diameter of 10 μm were used as substrate particles, and the substrate particles were stirred for 10 minutes with a cationic surfactant in order to modify the surface of the substrate particles. Then, after filtering and washing with water, stirring treatment was carried out in the palladium ion catalyst solu...

Embodiment 5

[0116] The manufacture method of the positive electrode compound of embodiment 5

[0117] Weigh the dry powder and lithium carbonate powder of the nickel-coated nickel composite hydroxide of Example 4 obtained in the above manner, and they are mixed so that Li / (Ni+Co+Mn)=1.03, and then, The primary firing was carried out at a temperature of 740° C. for 8.4 hours in an air atmosphere to obtain a lithium-nickel-containing coated nickel composite oxide as a primary firing powder. Then, the primary fired powder was pulverized, and the secondary firing was performed at a temperature of 940° C. for 8.4 hours in an air atmosphere. As a secondary firing powder, the lithium-nickel-containing coated nickel composite oxide of Example 5 was obtained.

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Abstract

The purpose of the present invention is to provide a high-strength compound for a positive electrode, the compound exhibiting an excellent capacity maintenance rate after a high temperature standing.This compound for a positive electrode has: a core which is a secondary particles resulting from aggregation of primary particles and which contains a nickel composite hydroxide; and a coating layer disposed on the surface of the core, containing elemental nickel, 500 ppm or less of elemental cobalt, and 10 ppm or less of elemental phosphorus. The content of the elemental nickel in the coating layer is 5 -20 parts by mass with respect to 100 parts by mass of the core, and the average crushing strength of the secondary particles is 45.0 MPa or greater.

Description

technical field [0001] The present invention relates to a compound for a positive electrode of a storage battery, and particularly relates to a compound for a positive electrode having high strength and excellent capacity retention after being left at a high temperature. Background technique [0002] In order to improve the performance of the compound for the positive electrode of the storage battery, a coating layer containing a metal element may be formed on the surface of the metal hydroxide as a core. For example, a surface-modified nickel hydroxide obtained by coating the surface of nickel hydroxide as a core with cobalt oxide has been proposed as a positive electrode active material for alkaline storage batteries with a high positive electrode utilization rate and improved cycle characteristics (Patent Document 1) . [0003] However, in Patent Document 1, the positive electrode active material obtained by coating the surface of nickel hydroxide with cobalt oxide can o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52C01G53/00H01M4/50H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M4/50H01M4/52C01G53/00Y02E60/10H01M4/366C01G53/006C01G53/42H01M10/345H01M10/052H01M2300/0014H01M2300/0025
Inventor 田中聪花村直也畑未来夫
Owner TANAKA CHEM
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