Method for preparing high-compaction high-voltage lithium cobaltite cathode material

A positive electrode material, high-voltage technology, applied in battery electrodes, circuits, electrical components, etc.

Inactive Publication Date: 2011-07-13
NINGBO JINHE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But high compaction, high voltage gradient material, lithium nickel manganese oxide c

Method used

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  • Method for preparing high-compaction high-voltage lithium cobaltite cathode material
  • Method for preparing high-compaction high-voltage lithium cobaltite cathode material
  • Method for preparing high-compaction high-voltage lithium cobaltite cathode material

Examples

Experimental program
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Embodiment 1

[0023] Mix 10L of the configured 5mol / L nickel sulfate solution and 30L of the configured 5mol / L manganese sulfate solution in a 500L reactor, and slowly add the 5mol / L complex with a peristaltic pump under vigorous stirring. Mixture of ammonia solution 10L. Stir for 1 hour to mix well and form a complex nickel-manganese solution. Slowly add 192.64Kg of tricobalt tetroxide and stir for 1 hour. After the tricobalt tetroxide is completely infiltrated, use a peristaltic pump to add 5mol / L sodium hydroxide solution at a uniform speed until the pH of the solution is 11 and stop adding. Continue stirring and aging for 24 hours, control the reaction temperature at 50°C, and the stirring speed at 500r / min to obtain [Ni 0.5 mn 1.5 (OH) 4 ] 0.2 (Co 3 o 4 ) 0.8 The precursor was washed with deionized water until the pH value was 8, dried in a drying oven at 100°C, and sintered at 500°C to obtain the oxide of the precursor. Lithium carbonate is added according to the ratio of lith...

Embodiment 2

[0027]Mix 50L of the configured 5mol / L nickel sulfate solution and 50L of the configured 5mol / L manganese sulfate solution in a 500L reactor, and slowly add the 5mol / L complex with a peristaltic pump under vigorous stirring. Mixture ammonia solution 15L. Stir for 1 hour to mix well and form a complex nickel-manganese solution. Slowly add 280.77Kg of tricobalt tetroxide and stir for 1 hour. After the tricobalt tetroxide is completely infiltrated, use a peristaltic pump to add 5mol / L sodium hydroxide solution at a uniform speed until the pH of the solution is 11 and stop adding. Continue stirring and aging for 24 hours, control the reaction temperature at 50°C, and the stirring speed at 500r / min to obtain [Ni 0.5 mn 0.5 (OH) 2 ] 0.3 (Co 3 o 4 ) 0.7 The precursor was washed with deionized water until the pH value was 8, dried in a drying oven at 120°C, and sintered at 500°C to obtain the oxide of the precursor. Lithium carbonate is added according to the ratio of lithium ...

Embodiment 3

[0029] Mix 50L of the configured 3mol / L nickel sulfate solution and 50L of the configured 2mol / L manganese sulfate solution in a 500L reaction kettle, and slowly add 1mol / L of the complex with a peristaltic pump under vigorous stirring. Mixture ammonia solution 20L. Stir for 1 hour to mix well and form a complex nickel-manganese solution. Slowly add 240.80Kg of tricobalt tetroxide and stir for 1 hour. After the tricobalt tetroxide is completely infiltrated, use a peristaltic pump to add 5mol / L sodium hydroxide solution at a uniform speed until the pH of the solution is 12 and stop adding. Continue stirring and aging for 24 hours, control the reaction temperature at 50°C, and the stirring speed at 600r / min to obtain [Ni 0.6 mn 0.4 (OH) 2 ] 0.2 (Co 3 o 4 ) 0.8 The precursor was washed with deionized water until the pH value was 8, dried in a drying oven at 120°C, and sintered at 450°C to obtain the oxide of the precursor. Lithium carbonate is added according to the ratio...

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Abstract

The invention relates to a method for preparing a high-compaction high-voltage lithium cobaltite cathode material. The method comprises the following concrete steps and implementation manners: by using a coprecipitation method, coating an NixMny(OH)z layer on the surface of a cobaltosic oxide in the preparation method to obtain a precursor of a gradient material [NixMny(OH)z]n.(Co3O4)1-n, wherein x is more than or equal to 0.1 and less than or equal to 0.75, y is more than or equal to 0.3 and less than or equal to 1.5, n is more than or equal to 0 and less than or equal to 0.35, and z is 2 or 4; tempering and sintering at a certain temperature to form an oxide in a gradient structure of [NixMnyOz]n.(Co3O4)1-n; and adding lithium and carrying out secondary sintering, thus obtaining the high-compaction high-voltage gradient cathode material. The lithium cobaltite cathode material has good cycle performance at high voltage, the product process is simple and is easy to control, and the cathode material is applicable to batch production.

Description

technical field [0001] The invention relates to a method for preparing a novel gradient high-voltage lithium ion positive electrode material, in particular to a method for preparing a high-pressure, high-voltage lithium cobaltate positive electrode material, or a method for preparing a double high-voltage lithium cobaltate positive electrode material. technical background [0002] Since Sony put lithium-ion secondary batteries on the market in 1991, lithium-ion secondary batteries have played an increasingly important role in people's daily lives, and they are widely used in portable electronic products and mobile tools. At present, the positive electrode materials studied have a layered structure mainly LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn with spinel structure 2 o 4 , LiFePO with olivine structure 4 wait. Among them, lithium cobalt oxide cathode material is easy to synthesize, excellent in cycle, safe and stable, and is one of the earliest cathode materials used in com...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张家昌陈珍华何金华郑雪琴
Owner NINGBO JINHE NEW MATERIALS
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