Nickel-cobalt-aluminum ternary cathode material with high tap-density and preparation method of nickel-cobalt-aluminum ternary cathode material

A technology of positive electrode material and tap density, which is applied in the field of nickel-cobalt-aluminum ternary positive electrode material with high tap density and its preparation, can solve problems such as unfavorable industrial production, non-continuous operation, cumbersome steps, etc., and achieve product consistency Good, reduce ion mixing, simple process effect

Inactive Publication Date: 2016-04-13
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has cumbersome steps, increases the cost, and can only be produced in a single kettle, and cannot be operated continuously, which is not conducive to industrial production

Method used

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  • Nickel-cobalt-aluminum ternary cathode material with high tap-density and preparation method of nickel-cobalt-aluminum ternary cathode material
  • Nickel-cobalt-aluminum ternary cathode material with high tap-density and preparation method of nickel-cobalt-aluminum ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, prepare a 1.5mol / L nickel-cobalt mixed solution with nickel nitrate and cobalt nitrate, wherein the molar ratio of nickel and cobalt is 0.86:0.14, prepare 3.0mol / L sodium hydroxide solution and 2.0mol / L ammonia solution, Add the above three solutions into the reaction kettle concurrently, adjust by the online pH automatic control system, control the pH value in the reaction kettle to 11.2, temperature 50°C, ammonia concentration 5g / L, stirring speed 700rpm, co-precipitation reaction, overflow discharge. The slurry is washed until the pH is less than 8.0, dried at 150° C., and sieved to obtain spherical nickel-cobalt precursor powder.

[0027] Secondly, the above-mentioned nickel-cobalt precursor, aluminum oxide, magnesium hydroxide, and lithium hydroxide are mixed uniformly according to the molar ratio of metal ions of 0.93:0.07:0.003:1.03, and placed in an oxygen-enriched atmosphere (oxygen mass fraction greater than 95%) at 450°C Pre-fired for 6 hours, then dir...

Embodiment 2

[0030] First, prepare a 1.0mol / L nickel-cobalt mixed solution with nickel chloride and cobalt sulfate, in which the molar ratio of nickel and cobalt is 0.867:0.133, prepare 1.0mol / L sodium carbonate solution, 0.5mol / L EDTA and ammonia water Mix the solution (where EDTA is 0.3mol / L, and ammonia water is 0.2mol / L), add the above three solutions into the reactor in parallel, and adjust it by the online pH automatic control system to control the pH value in the reactor to 8.1 and the temperature to 25°C , complexing agent concentration 2g / L, stirring speed 500rpm, co-precipitation reaction, overflow discharge. The slurry is washed until the pH is less than 8.0, dried at 150° C., and sieved to obtain spherical nickel-cobalt precursor powder.

[0031] Secondly, the above-mentioned nickel-cobalt precursor, aluminum nitrate, and lithium carbonate were mixed uniformly according to the metal ion molar ratio of 0.98:0.02:1.06, and pre-fired in an oxygen-enriched atmosphere (oxygen mass f...

Embodiment 3

[0033] First, prepare a 2.0mol / L nickel-cobalt mixed solution with nickel acetate and cobalt acetate, wherein the molar ratio of nickel and cobalt is 0.778:0.222, prepare 8.0mol / L sodium hydroxide solution and 10.0mol / L ammonia solution, The above three solutions were added into the reaction kettle in parallel, and adjusted by the online pH automatic control system to control the pH value in the reaction kettle to 12.0, the temperature to 60°C, the concentration of ammonia water to 13g / L, and the stirring speed to 800rpm. Co-precipitation reaction, overflow discharge. The slurry is washed until the pH is less than 8.0, dried at 120° C., and sieved to obtain spherical nickel-cobalt precursor powder.

[0034]Secondly, the above-mentioned nickel-cobalt precursor, aluminum hydroxide, copper nitrate, and lithium acetate were mixed uniformly according to the metal ion molar ratio of 0.90:0.10:0.005:1.09, and preheated in an oxygen-enriched atmosphere (oxygen mass fraction greater tha...

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Abstract

The invention relates to a nickel-cobalt-aluminum ternary cathode material with high tap-density and a preparation method of the nickel-cobalt-aluminum ternary cathode material. The method comprises the following steps: adding a nickel-cobalt mixed solution, a precipitant solution and a complexing agent solution to a reaction kettle in parallel flow; controlling the pH value, the temperature, the complexing agent concentration and the stirring speed in the reaction kettle, carrying out co-precipitation reaction and overflow discharge, washing slurry until the pH is smaller than 8.0, and carrying out drying and sieving to obtain spherical nickel-cobalt precursor powder; and mixing the nickel-cobalt precursor powder, an aluminum-containing compound, a doped compound and a lithium salt evenly, presintering the mixture at a low temperature, directly increasing the temperature for heat preservation, naturally cooling the mixture, and crushing an sieving the mixture to obtain the nickel-cobalt-aluminum ternary cathode material with high tap-density. Divalent metal ions are doped, so that a layered crystal structure of the material is stabilized; the content of Ni<3+> is improved; and shuffling of Li<+> and Ni<2+> ions is reduced. According to the method, continuous mass production can be achieved. The nickel-cobalt-aluminum ternary cathode material has the advantages of good rate capability, high discharge capacity, long cycle lifetime and the like.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a nickel-cobalt-aluminum ternary cathode material with high tap density and a preparation method thereof. (2) Background technology [0002] Cathode material is a key component of lithium-ion batteries, which restricts its performance. The nickel-cobalt-aluminum ternary material with nickel content as the main content has the advantages of high discharge capacity, low temperature and rate performance, and long cycle life. The lithium-ion battery produced by Tesla and used in the Model S electric car that is popular all over the world has nickel as its positive electrode. Cobalt aluminum ternary material. In addition, world-renowned power battery manufacturers such as LG, AESC, and Panasonic are mass-producing lithium-ion batteries with nickel-cobalt-aluminum ternary materials as positive electrodes. [0003] Although nickel-cobalt-aluminum tern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485H01M10/0525
CPCH01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 宋春华王瑛乔文灿王文阁赵成龙冯涛段振山赵艳丽黄振法赵秀萍
Owner SHANDONG YUHUANG NEW ENERGY TECH
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