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Preparation method of cobalt-based material

A cobalt-based, nickel-cobalt-manganese technology, used in electrical components, battery electrodes, circuits, etc., to achieve good charge-discharge cycle performance and low cost of use

Active Publication Date: 2011-01-12
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are not many industrial applications of lithium nickel cobalt manganese oxide in China, especially in the field of power supply applications for portable electronic devices. The industrial application defects of lithium nickel cobalt manganese oxide still need to be overcome

Method used

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  • Preparation method of cobalt-based material
  • Preparation method of cobalt-based material
  • Preparation method of cobalt-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the 50L spherical cobalt tetroxide reactor (for the structure of the spherical cobalt tetroxide reactor, please refer to the Chinese utility model patent ZL 200920113581.4, the date of authorization announcement was December 9, 2009; the spherical cobalt trioxide reactor, including the driving device, stirring shaft, and exhaust pipe , kettle cover, feed pipe, discharge pipe, discharge port, submerged coil heat exchanger, temperature sensor, pressure sensor, stirring blade, kettle body, and the end of the stirring shaft extending into the kettle body is connected to the stirring blade. The characteristics are The mixture in the reaction kettle is heated evenly, the quality is relatively stable, the temperature is easy to control, and the production efficiency and product quality are greatly improved), add 25L of deionized water, turn on the stirring paddle, and heat to 85-95 ℃, weigh 5kg of spherical cobalt trioxide matrix with a cobalt content of 73% and slowly add i...

Embodiment 2

[0027] Add 25L of deionized water into the 50L spherical cobalt tetroxide reaction kettle, turn on the stirring paddle, and heat to 85-95°C, weigh 5kg of spherical cobalt trioxide tetroxide with a cobalt content of 73%, slowly add it into the reaction kettle, and stir for 1 hour. Add ammonia water to adjust the ammonia concentration in the reactor to 1±0.1mol / L.

[0028] The total concentration of nickel-manganese-cobalt prepared is 2.5mol / L, and the feed solution 22.02L of nickel-manganese-cobalt ratio is 4.25:4.25:1.5; The preparation concentration is 1L of ammonium sulfate solution of 1mol / L, joins in the prepared feed solution to obtain Mixed solution; pass the mixed solution and 8mol / L sodium hydroxide solution into the reactor for reaction at the same time, control the pH value in the reactor to 11-12, and the reaction temperature to 85-95°C.

[0029] When the feed liquid is finished, continue to raise the pH to 13 by sodium hydroxide solution, continue to keep warm at 8...

Embodiment 3

[0034]Add 25L of deionized water into the 50L spherical cobalt tetroxide reaction kettle, turn on the stirring paddle, and heat to 85-95°C, weigh 2.5kg of spherical cobalt tetraoxide matrix with a cobalt content of 73%, slowly add it into the reaction kettle, and stir for 1 hour , feed ammonia water to adjust the ammonia concentration in the reactor to 1±0.1mol / L.

[0035] Prepare 9.01 L of a feed solution with a total concentration of nickel, manganese and cobalt of 2.5 mol / L and a ratio of nickel, manganese and cobalt of 4.75:4.75:0.5, prepare 1 L of ammonium sulfate solution with a concentration of 1 mol / L, and add it to the prepared feed solution to obtain a mixed solution , feed the mixed solution and 8mol / L sodium hydroxide solution into the reaction kettle at the same time, control the pH value in the reaction kettle to be 11-12, and the reaction temperature is 85-95°C.

[0036] After the feeding of the feed liquid, continue to raise the pH to 12.5 by sodium hydroxide s...

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Abstract

The invention discloses a preparation method of a cobalt-based material for the positive poles of lithium batteries, which comprises the following steps of: coating a nickel-cobalt-manganese hydroxide on the outer surface of spherical cobaltosic oxide and sintering to form the cobalt-based material of LiCo0.6Mn0.2Ni0.2O2. The cobalt-based material prepared by using the preparation method only not maintains the characteristics of lithium cobaltate materials of high volumetric specific energy and high discharge platform, but also has higher heat stability compared with lithium cobaltate, also reduces the cost of the lithium cobaltate materials and is the substitute of the next generation lithium cobaltate positive pole materials.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, in particular to a preparation method of a cobalt-based material for a positive electrode of a lithium battery. Background technique [0002] The power supply of portable electronic equipment, with the rapid development and progress of modern science and technology and people's requirements for the use of portable electronic equipment, is developing towards the trend of high efficiency, small size, light weight, thin shape and flexible diversification. This leads to new requirements for power supply materials for portable electronic equipment, and also brings huge market prospects for new portable electronic equipment power supplies and portable electronic equipment that meet the new requirements. [0003] Since lithium-ion batteries were put into large-scale industrial applications, lithium cobalt oxide cathode materials have been occupying the power supply of portable elec...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 袁巧平沈恒冠陈明峰陆益展
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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