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Nickel cobalt lithium aluminate positive material and preparation method thereof

A technology of lithium nickel cobalt aluminate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc. Performance deterioration and other problems, to avoid uneven distribution of components, high production efficiency, high product quality effect

Inactive Publication Date: 2014-08-13
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, coprecipitation requires a long preparation cycle, numerous procedures, and poor uniformity of electrical properties of the product; although the traditional solid-phase method is simple in process operation, the contact area between solid reactants is much smaller than its specific surface area, and it is difficult to control the uniform distribution of elements. Uniformity of appearance and shape, the electrical performance of the product deteriorates

Method used

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  • Nickel cobalt lithium aluminate positive material and preparation method thereof
  • Nickel cobalt lithium aluminate positive material and preparation method thereof
  • Nickel cobalt lithium aluminate positive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The molar ratio of Ni:Co:Al is 0.8:0.15:0.05 and nickel hydroxide, cobalt tetraoxide and aluminum oxide are mixed, and then according to the mass ratio of material:ball:water=1:1:5, after ball milling for 5h and mixing evenly, The ball-milled slurry is spray-dried; the dried powder is calcined in oxygen at 500° C. for 4 hours, and the precursor is obtained after cooling.

[0027] Mix the above-mentioned roasted nickel-cobalt lithium aluminate positive electrode material precursor and lithium carbonate according to the ratio of Li:(Ni+Co+Al) of 1.05:1, ball mill for 2 hours and mix evenly, then spray-dry the slurry, and after drying The powder was calcined at 900° C. for 8 hours, the sintering atmosphere was an oxygen atmosphere, cooled, pulverized, and sieved to obtain a nickel-cobalt-lithium-aluminate cathode material.

[0028] The electrochemical performance test of the material is tested at 25°C with the blue battery test system, and the test voltage range is 2.7V to...

Embodiment 2

[0030] The molar ratio of Ni:Co:Al is 0.75:0.2:0.05 and nickel hydroxide, cobalt tetraoxide and aluminum oxide are mixed, and then according to the mass ratio of material:ball:water=1:1:5, ball milling is carried out for 6h after mixing evenly, The ball-milled slurry was spray-dried; the dried powder was calcined in oxygen at 600° C. for 4 hours, and the precursor was obtained after cooling.

[0031] Mix the above-mentioned roasted nickel-cobalt lithium aluminate positive electrode material precursor and lithium carbonate according to the ratio of Li:(Ni+Co+Al) of 1.05:1, ball mill for 3 hours and mix evenly, then spray-dry the slurry, and after drying The powder was calcined at a high temperature of 950°C for 6 hours, the sintering atmosphere was an oxygen atmosphere, cooled, pulverized, and sieved to obtain a nickel-cobalt-lithium-aluminate positive electrode material.

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Abstract

The invention relates to a nickel cobalt lithium aluminate positive material and a preparation method thereof. The material has a chemical general formula of LiNi(1-a-b)CoaAlbO2, wherein a is more than 0.1 and less than 0.3, b is more than 0.01 and less than 0.2, and 1-a-b is more than 0 and less than 1. The preparation method comprises the following steps: mixing an insoluble nickel compound, cobalt compound and aluminum compound, performing ball-milling for 4-8 hours, uniformly mixing, performing spray drying, roasting in an oxygen atmosphere at low temperature of 400-600 DEG C for 1-10 hours, mixing with a lithium salt, uniformly ball-milling, performing spray drying, calcining in an oxygen atmosphere at high temperature of 800-1000 DEG C for 6-16 hours, cooling, grinding and screening to prepare the product. Moisture is rapidly evaporated by spray drying, powder with consistent particle size is formed, the evaporation process of an evaporation drying method and a subsequent crushing process are omitted, the process flow is simple, and industrial production is easily realized. Moreover, the material is excellent in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a nickel-cobalt lithium aluminate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in mobile digital products such as mobile phones, cameras, and notebook computers. With the advancement of science and technology, the application fields of lithium-ion batteries will become wider and wider, and the requirements for their size, weight, and service life will become higher and higher. However, the cathode materials such as lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide currently used in the market have been difficult to meet the needs of the market. [0003] Nickel cobalt lithium aluminate cathode material has the advantage of higher capacity, and its cycle performance and safety performance can be improved by improving its preparation method and powder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485
CPCY02E60/122H01M4/485H01M4/525H01M10/0525H01M2220/30Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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