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Preparation method of lithium-nickel-cobalt-aluminum composite metal oxide

A composite metal, lithium nickel cobalt aluminum technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low material tap density, poor cycle performance, ammonia pollution, etc., to achieve high capacity and improve tap density. , the effect of reducing environmental pollution

Active Publication Date: 2012-09-26
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems such as the difficulty in industrial preparation of lithium-nickel-cobalt-aluminum composite metal oxide in the prior art lithium-ion positive electrode material, ammonia pollution in the preparation process, low tap density and poor cycle performance of the obtained material, the purpose of the present invention is to To provide a non-polluting secondary precipitation method that first precipitates nickel-cobalt salts to form spherical precursors, and then precipitates aluminum salts. By this method, the present invention can prepare lithium-nickel-cobalt with high capacity, high tap density and high cycle life. Aluminum Composite Metal Oxide

Method used

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  • Preparation method of lithium-nickel-cobalt-aluminum composite metal oxide

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Embodiment 1

[0033] First, nickel sulfate and cobalt sulfate are mixed in a molar ratio of 0.842:0.158 to prepare a 1.5mol / L aqueous solution, and sodium hydroxide and sodium carbonate are prepared to be mixed aqueous solutions with concentrations of 3mol / L and 4mol / L respectively. Then use a peristaltic pump to simultaneously add a nickel-cobalt mixed aqueous solution and a sodium hydroxide-sodium carbonate mixed alkaline solution to a 2L reactor containing 200mL of a 1mol / L sodium carbonate aqueous solution. Stir the reactor with a stirrer all the time, control the temperature of the reactor at 50°C, and make the pH of the reaction solution = 11.0-11.5. After 8 hours of reaction, the mixed liquid of the precursor of the spherical nickel-cobalt hydroxide is obtained, which is filtered and washed with pure water. , to obtain nickel-cobalt precursor precipitates.

[0034] Then add the washed nickel-cobalt precursor precipitate into the reaction kettle, add 800mL of pure water, stir with the...

Embodiment 2

[0040] Other operations are the same as in Example 1, except that: Ni:Co=0.889:0.111 is used for the first precipitation to prepare a mixed aqueous solution, and (Ni+Co):Al=90:10 is added for the second precipitation to add aluminum sulfate aqueous solution. Get the chemical composition as Li 1.04 Ni0 .8 co 0.1 Al 0.1 o 1.99 f 0.01 lithium nickel cobalt aluminum composite metal oxide material.

Embodiment 3

[0042] Other operations are the same as in Example 1, except that: the mixed aqueous solution is formulated according to Ni:Co=0.816:0.184 during the first precipitation, and the aluminum sulfate aqueous solution is added according to (Ni+Co):Al=98:2 during the second precipitation. Get the chemical composition as Li 1.04 Ni0 .8 co 0.18 Al 0.02 o 1.99 f 0.01 The lithium-nickel-cobalt-aluminum composite metal oxide material, its scanning electron microscope picture is as follows figure 2 shown, from figure 2 It can be seen that the secondary particles of the material are spherical, which ensures a high tap density, and the primary particles grow well and the reaction is complete.

[0043]

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Abstract

The invention belongs to the field of a secondary battery, and particularly relates to a preparation method of a lithium-nickel-cobalt-aluminum composite metal oxide, which comprises the following steps: using a pollution-free carbonate complexing agent to firstly precipitate nickel and cobalt salts to form a spherical precursor, then precipitating aluminum salts through a secondary precipitation method to obtain a nickel-cobalt-aluminum precipitate, cleaning, drying, mixing with lithium salts, and sintering to obtain the lithium-nickel-cobalt-aluminum composite metal oxide having mixed and doped metal ions and anions. The invention solves the problems that the industrial preparation of the lithium-nickel-cobalt-aluminum composite metal oxide (a lithium ion positive pole material) is difficult in the prior art, ammonia gas is polluted in the preparation process, the obtained material has low tap density and poor cycle performance and the like. Besides, the prepared product has the characteristics of high tap density and high cycle performance.

Description

Technical field [0001] The present invention involves the secondary battery field, which specifically involves a preparation method of positive electrode materials. More specifically, it provides a method of preparation of lithium nickel -cobalt aluminum composite metal oxide with high -volume high -capacity, high vibration density, and high -cycle life.Essence Background technique [0002] Lithium ion battery is a new green high -energy rechargeable battery that appeared in the early 1990s. It has good voltage platforms, excellent cycle stability and thermal stability, low price and other advantages.Tools, electronic meters, etc. are one of the positive electrode materials with great potential.The positive electrode material of the lithium ion battery is a bottleneck that restricts the development of lithium -ion batteries, which determines the performance, price and development of lithium ion batteries.Therefore, research and development of high -performance positive materials ...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCY02E60/122Y02E60/10
Inventor 俞晓峰王国光陈文洪
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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