Process for preparing lithium cobalt oxide of lithium-ion secondary battery cathode materials

A technology for secondary batteries and positive electrode materials, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of reduced thermal stability, reduced battery capacity, reduced load performance, etc., and achieves improved high temperature characteristics and high discharge capacity. Effect

Active Publication Date: 2010-04-14
NANTONG RESHINE NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in lithium cobalt oxide to which foreign elements are added, since the foreign elements do not contribute to the battery reaction (charge-discharge reaction), there arises a problem that the capacity of the battery decreases and the charge-discharge efficiency also decreases as the amount of these foreign elements added increases.
In addition, since the crystallinity is lowered due to the addition of different elements, there are also problems that the thermal stability is lowered an

Method used

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  • Process for preparing lithium cobalt oxide of lithium-ion secondary battery cathode materials
  • Process for preparing lithium cobalt oxide of lithium-ion secondary battery cathode materials

Examples

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Embodiment 1

[0055] A preparation method of lithium cobaltate lithium ion secondary battery cathode material, comprising the following steps:

[0056] a. be 1.0~1.1 to mix cobalt hydroxide or cobalt oxyhydroxide powder and lithium carbonate powder by the mol ratio of Li / Co;

[0057] b. Calcining the obtained mixture in an oxygen-containing atmosphere at 850-1100° C. for 5-55 hours;

[0058] c. naturally cooling the calcined calcined product to room temperature, and then pulverizing;

[0059] d. Use a laser bulk particle size distribution measuring device to classify, and select an average particle size D50 of 8 to 20 μm to obtain a semi-finished product of lithium cobaltate;

[0060] e. On the surface of the lithium cobalt oxide semi-finished product, the coating component treatment process is carried out through a device with high-speed shear force.

[0061] Continuously mix cobalt sulfate aqueous solution and ammonia water mixed solution with sodium hydroxide aqueous solution, continuo...

Embodiment 2

[0067] Same as Example 1, except that there is no coating treatment, the DSC decomposition temperature of this material is 180°C.

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Abstract

The invention provides a process for preparing lithium cobalt oxide of lithium-ion secondary battery cathode materials. The process includes that cobalt oxide or hydroxyl cobalt oxide powders and lithium carbonate powders are mixed according to a lithium/cobalt molar ratio of 1.0-1.1 and calcined in an atmosphere containing oxygen at the temperature of 850-1100 DEG C; obtained mixture is calcined for 5-55 hours in the atmosphere containing oxygen at the temperature of 850-1100 DEG C; calcined products are naturally cooled to reach room temperature and then grinded; laser scattered grain size distribution measuring device is used for classifying; lithium cobalt oxide semi-finished products are obtained by selecting an average grain diameter D50 of 8-20 micrometers; and a device with high-speed shear strength function is used for conducting coating composition treatment process on the surfaces of the lithium cobalt oxide semi-finished products. The process has the advantages of low raw material cost, high volume energy density, good safety, fine charge-discharge cycle performance, high pressurizing density and superior productivity.

Description

technical field [0001] The present invention relates to a lithium cobaltate material with excellent characteristics in many aspects such as high volume energy density, safety, charge-discharge cycle, pressurized density and productivity, etc., by using cheap cobalt hydroxide or cobalt oxyhydroxide and lithium carbonate The method, especially a kind of preparation method of lithium cobaltate lithium ion secondary battery anode material. Background technique [0002] In recent years, with the development of portable and wireless equipment, the demand for non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries with small size, light weight and high energy density has been increasing. As we all know, the positive electrode active material for this non-aqueous electrolyte secondary battery has LiCoO 2 , LiNiO 2 、LiNi 0.8 co 0.2 o 2 、LiNi 0.33 co 0.33 mn 0.33 o 2 , LiMn 2 o 4 、LiFePO 4 Composite oxides or phosphates of lithium and transition...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/525H01M4/62H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张新龙池田一崇
Owner NANTONG RESHINE NEW MATERIAL
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