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Cobalt hydroxide, method for producing same, cobalt oxide, and method for producing same

A technology of cobalt hydroxide and a manufacturing method, which is applied in the directions of cobalt oxide/cobalt hydroxide, electrical components, battery electrodes, etc., can solve problems such as affecting battery safety and increasing gas

Active Publication Date: 2013-07-10
NIPPON CHECMICAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above method (1) has the following problems: small particles will affect the safety of the battery, especially when the charge and discharge are repeated, the gas generated by the reaction with the non-aqueous electrolyte will increase
In addition, the above method (2) has the following problems: due to LiNi 0.85 co 0.15 o 2 The lithium compound used in the manufacture of the lithium compound will remain as a residual alkali and affect the safety of the battery, especially when the charge and discharge are repeated, the gas generated by the reaction with the non-aqueous electrolyte will increase

Method used

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  • Cobalt hydroxide, method for producing same, cobalt oxide, and method for producing same
  • Cobalt hydroxide, method for producing same, cobalt oxide, and method for producing same
  • Cobalt hydroxide, method for producing same, cobalt oxide, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5、 comparative example 1～4）

[0144]

[0145] Add 0.35L of initial sample liquid into a 2L reaction vessel, and heat to the reaction temperature shown in Table 1.

[0146] Next, while stirring the reaction solution (initial sample liquid) in the reaction vessel at the stirring speed described in Table 1, the pH of the reaction solution reached the pH described in Table 1. Add the cobalt aqueous solution and the alkaline aqueous solution dropwise at the indicated reaction temperature and dropping time to carry out the neutralization reaction.

[0147] After the neutralization reaction, the reaction liquid was cooled, and then, the product was filtered and washed with water, and then dried at 70° C. to obtain cobalt hydroxide.

[0148] Table 2 shows the average particle diameter, compressive strength, pulverization characteristics, and tap density of the obtained secondary particles of cobalt hydroxide.

Embodiment 6）

[0150]

[0151] The reaction was carried out under the same conditions as in Examples 1 to 5 except that the reaction conditions shown in Table 1 were used to obtain cobalt hydroxide.

[0152] Table 2 shows the average particle diameter, compressive strength, pulverization characteristics, and tap density of the obtained secondary particles of cobalt hydroxide.

Embodiment 7）

[0154]

[0155] The cobalt hydroxide obtained in embodiment 3 was roasted in the atmosphere at 500° C. for 5 hours to obtain cobalt oxide (Co 3 o 4 ).

[0156] Table 2 shows the average particle diameter, compressive strength, pulverization characteristics, and tap density of the obtained secondary particles of cobalt oxide.

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PUM

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Abstract

The purpose of the invention is to obtain cobalt hydroxide and cobalt oxide, each having high aggregability even if a secondary particle size is large. The invention is cobalt hydroxide characterized by being in the form of secondary particles obtained by aggregating primary particles, comprising, as the primary particles constituting the secondary particles, primary particles in the form of a plate, a pillar, or a needle having a major axis length determined by SEM image analysis of 1.5 [mu]m or more, and having a tap density of 0.80 g / mL or more.

Description

technical field [0001] The present invention relates to cobalt hydroxide or cobalt oxide, particularly cobalt hydroxide or cobalt oxide suitable for use as a raw material for producing lithium-cobalt composite oxides for lithium secondary batteries, and methods for producing them. Background technique [0002] In recent years, with the rapid advancement of portable and cordless home appliances, lithium-ion secondary batteries have been put into practical use as power sources for small electronic devices such as laptop personal computers, mobile phones, and video cameras. For this lithium-ion secondary battery, since lithium cobalt oxide (LiCoO 2 ) has been used as a positive electrode active material for lithium-ion secondary batteries, research and development on lithium-transition metal composite oxides has been actively carried out, and many proposals have been proposed so far. [0003] As the lithium transition metal composite oxide, lithium cobaltate (LiCoO 2 ), lithi...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/525
CPCC01G51/04C01P2004/03C01P2004/10C01P2004/20C01P2004/45C01P2004/52C01P2004/61C01P2006/11H01M4/525Y02E60/10
Inventor 大石义英
Owner NIPPON CHECMICAL IND CO LTD
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