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Prepn of nano lithium cobaltate particle

A technology of nano-lithium cobalt oxide and particles, which is applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of narrow particle size distribution, small particle size, and small non-stoichiometric shift, achieving low cost and easy solution The effect of agglomeration and uniform particle size

Inactive Publication Date: 2004-09-08
上海广力投资管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobalt oxide is generally synthesized by solid-state method, but due to the limitations of this traditional method, it is difficult to obtain ideal powders with high purity, small non-stoichiometric deviation, small particle size and narrow particle size distribution, especially nanoparticles
Moreover, too high synthesis temperature and synthesis time will also affect its electrochemical performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Dissolve lithium hydroxide monohydrate in deionized water to form a 0.3mol / L solution, then dissolve cobalt nitrate (Co(NO 3 ) 2 ), then add polyacrylic acid with a molecular weight of 3000 in the proportion of 5% by weight, then spray dry at 200°C to form dry rubber powder, heat treat the dry rubber powder at 700°C for 3 hours, and obtain a particle size of 30- 40nm lithium cobalt oxide particles.

Embodiment 2

[0015] Dissolve lithium hydroxide monohydrate in deionized water to form a 1mol / L solution, then dissolve cobalt nitrate (Co(NO 3 ) 2 ), then add polyethylene glycol with a molecular weight of 6000 in a proportion of 9% by weight, then spray dry at 200°C to form dry rubber powder, and heat treat the dry rubber powder at 800°C for 4 hours to obtain a particle size of 20-50nm lithium cobalt oxide particles.

Embodiment 3

[0017] Dissolve lithium hydroxide monohydrate in deionized water to form a 0.5mol / L solution, then dissolve cobalt nitrate (Co(NO 3 ) 2 ), then add polyacrylic acid with a molecular weight of 3000 in a ratio of 5% by weight, then quickly evaporate the solution to dryness in a stainless steel pan preheated to 150°C to form dry rubber powder, and heat treat the dry rubber powder at 700°C for 4 hours, to obtain lithium cobaltate particles with a particle size of 40-60nm.

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Abstract

The present invention discloses preparation process of nano lithium cobaltate particle. It is one wet chemical process including dissolving monohydrate of lithium hydroxide and soluble cobalt salt, introducing organic dispersant to prevent aggregate of the primary particles, spray drying or fast solution evaporating to obtain dry powder, and heat treatment at 500-1000 deg.c to obtain 10-100 nm lithium cobaltate particle. The nano lithium cobaltate product of the present invention may be used widely in the production of lithium cell, non-water electrolyte, etc.

Description

technical field [0001] The invention relates to a method for preparing nano lithium cobalt oxide particles. Background technique [0002] With the development of the information industry and the advancement of science and technology, mobile appliances, electric vehicle technology, energy storage batteries for large power plants, UPS power supplies, medical instrument power supplies, and space and other fields have put forward higher requirements for batteries. The secondary lithium-ion battery has the advantages of high working voltage, light weight, large specific energy, small self-discharge, long cycle life, no memory effect, and less environmental pollution. It is a very good choice. At present, the commonly used cathode materials for secondary lithium batteries are mainly LiCoO 2 , LiNiO 2 and LiMn 2 o 4 etc., where LiNiO 2 The synthesis process of is difficult to control, and it is easy to form non-stoichiometric compounds. while LiMn 2...

Claims

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Application Information

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IPC IPC(8): C01G51/00
Inventor 翁文剑黄德欢韩高荣
Owner 上海广力投资管理有限公司
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