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Nickel cobalt manganese hydroxide precursor and preparation method thereof

A nickel-cobalt-manganese-hydroxide, hydroxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as unfavorable lithium ion diffusion, achieve good spherical shape, good particle fluidity, and the effect of utilizing diffusion

Active Publication Date: 2014-12-24
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned published patents can produce spherical nickel-cobalt-manganese hydroxide precursors, they do not control the surface morphology of the spherical precursor, which is not conducive to the diffusion of lithium ions during the sintering process.

Method used

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  • Nickel cobalt manganese hydroxide precursor and preparation method thereof
  • Nickel cobalt manganese hydroxide precursor and preparation method thereof
  • Nickel cobalt manganese hydroxide precursor and preparation method thereof

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preparation example Construction

[0032] In order to obtain the nickel-cobalt-manganese hydroxide precursor with the above-mentioned morphology, the present invention also discloses a preparation method of the above-mentioned nickel-cobalt-manganese hydroxide precursor, comprising the following steps:

[0033] Mix nickel salt, manganese salt and cobalt salt to obtain a mixed solution, the total concentration of nickel salt, manganese salt and cobalt salt in the mixed solution is 1 ~ 2mol / L, nickel ion in the nickel salt, cobalt in the cobalt salt The molar ratio of ions to manganese ions in the manganese salt is x:y:1-x-y, where 0<x<1, 0<y<1, x+y<1;

[0034] Mixing the additive with the mixed solution to obtain a first mixed solution, the ratio of the moles of the additive to the total moles of the nickel ions, cobalt ions and manganese ions is 0.005 to 0.1:1;

[0035] The first mixed solution, the sodium hydroxide solution with a concentration of 2 to 10 mol / L and the ammonia solution with a concentration of ...

Embodiment 1

[0052] (1) Prepare a mixed solution of nickel sulfate, cobalt sulfate and manganese sulfate, the molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate is 1 / 3:1 / 3:1 / 3, nickel sulfate, cobalt sulfate in the mixed solution The total concentration with manganese sulfate is 2mol / L;

[0053] (2) In the mixed solution, add 2% triethanolamine of the total moles of nickel sulfate, cobalt sulfate and manganese sulfate;

[0054] (3) Prepare a sodium hydroxide precipitant solution with a concentration of 5mol / L;

[0055] (4) Prepare an ammonia solution with a concentration of 5mol / L;

[0056] (5) Add the above three solutions continuously into the reactor with stirring, and control the amount of ammonia added to be NH 3 h 2 O: (Ni+Co+Mn)=1:1; adjust the flow rate of the sodium hydroxide precipitant solution to control the pH value of 11, pass argon protection during the reaction process, and age for 36 hours after the reaction for 20 hours. The reaction process is consis...

Embodiment 2

[0059] (1) Prepare a mixed solution of nickel chloride, cobalt chloride and manganese chloride, the molar ratio of nickel chloride, cobalt chloride and manganese chloride is 1 / 3:1 / 3:1 / 3, the mixed solution The total concentration of nickel chloride, cobalt chloride and manganese chloride in the medium is 2mol / L;

[0060] (2) In the mixed solution, add nickel chloride, cobalt chloride and polymaleic anhydride of 5% of the total moles of manganese chloride;

[0061] (3) Prepare a sodium hydroxide precipitant solution with a concentration of 10mol / L;

[0062] (4) Prepare an ammonia solution with a concentration of 8mol / L;

[0063] (5) Add the above three solutions continuously into the reactor with stirring, and control the amount of ammonia added to be NH 3 h 2 O: (Ni+Co+Mn)=8:1; adjust the flow rate of the sodium hydroxide precipitant solution to control the pH value to 10, pass nitrogen protection during the reaction process, and age for 48 hours after 20 hours of reaction ...

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Abstract

The invention provides a nickel cobalt manganese hydroxide precursor represented by a general formula (I). The hydroxide precursor is an orderly accumulated sphere with a page-like structure composed of a plurality of layers of sheets. The invention further provides a preparation method of the nickel cobalt manganese hydroxide precursor. In the process of preparing the nickel cobalt manganese hydroxide precursor, a sodium hydroxide solution, an ammonia water solution and a mixed solution of nickel salt, cobalt salt and manganese salt are reacted; and the nickel cobalt manganese hydroxide precursor which is the orderly accumulated sphere with the page-like structure is obtained by controlling pH and the amount of the ammonia water solution in the reaction process and adding an additive for adjusting particle morphology in the reaction process at the same time. The experimental results show that the nickel cobalt manganese hydroxide precursor prepared by the invention has better spherical morphology, uniform particle and good particle mobility; therefore, the nickel cobalt manganese hydroxide precursor is beneficial to diffusing lithium ion in the subsequent sintering process.

Description

technical field [0001] The invention relates to the technical field of preparation of energy materials, in particular to a nickel-cobalt-manganese hydroxide precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, no memory effect and low pollution, and are widely used in mobile phones, computers, digital products, instruments, power tools, electric bicycles, electric vehicles, national defense and other fields. At present, the positive electrode materials used in lithium-ion batteries mainly include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide and lithium nickel cobalt manganese oxide, etc. Among them, the positive electrode material with the largest market share is lithium cobalt oxide, but cobalt is a strategic resource. The small reserves, high price and poor safety performance of lithium cobaltate limit the further development of this material. Lithium nickel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 夏永高刘兆平袁国霞
Owner 宁波富理电池材料科技有限公司
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