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Ni-Co composite oxide and preparation method thereof

A composite oxide, nickel-cobalt technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of metal ion waste, increase production cost, and reduce product recovery rate, and achieve improved recovery rate, good sphericity, and vibration. High solid density effect

Active Publication Date: 2016-07-06
格林爱科(荆门)新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct discharge of mother liquor will cause waste of metal ions in raw materials, lower product recovery rate, and increase production cost. At present, there are very few reports on mother liquor recovery, treatment and reuse.

Method used

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  • Ni-Co composite oxide and preparation method thereof
  • Ni-Co composite oxide and preparation method thereof
  • Ni-Co composite oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A preparation method of nickel-cobalt composite oxide, comprising the following steps:

[0054] (1) get the mother liquor 50L after nickel-cobalt-aluminum carbonate centrifugation, wherein, nickel ion concentration is 4.21g / L, cobalt ion concentration is 61.5mg / L, aluminum ion concentration is 0.1mg / L, filters mother liquor with ultrafiltration machine The solid particles in the nickel-cobalt-aluminum mixed solution are obtained, and the content of nickel and cobalt ions in the nickel-cobalt-aluminum mixed solution is detected;

[0055] (2) adding a certain amount of CoCl to the nickel-cobalt-aluminum mixed solution 2 crystals, and mix them uniformly, adjust the molar ratio of nickel and cobalt in the mixed batch to be 75:25, to obtain a mixed batch, and the total concentration of nickel-cobalt metal ions in the mixed batch is 80g / L;

[0056] (3) adding 3L of pure water to the reactor with a volume of 50L, adding the ammonium oxalate solution of 80g / L, adjusting the pH...

Embodiment 2

[0061] A preparation method of nickel-cobalt composite oxide, comprising the following steps:

[0062] (1) get the mother liquor 100L after the nickel-cobalt-aluminum carbonate centrifugation, wherein, the nickel ion concentration is 4.96g / L, the cobalt ion concentration is 67.5mg / L, and the aluminum ion concentration is 0.2mg / L, and the mother liquor is filtered with an ultrafiltration machine The solid particles in the nickel-cobalt-aluminum mixed solution are obtained, and the content of nickel and cobalt ions in the nickel-cobalt-aluminum mixed solution is detected;

[0063] (2) adding a certain amount of CoCl to the nickel-cobalt-aluminum mixed solution 2 crystals, and mix them evenly, adjust the molar ratio of nickel and cobalt in the mixed batch to be 80:20 to obtain a mixed batch, and the total concentration of nickel-cobalt metal ions in the mixed batch is 80g / L;

[0064] (3) adding 3L of pure water to the reactor with a volume of 50L, adding the ammonium oxalate sol...

Embodiment 3

[0069] A preparation method of nickel-cobalt composite oxide, comprising the following steps:

[0070] (1) get the mother liquor 100L after the nickel-cobalt-aluminum carbonate centrifugation, wherein, the nickel ion concentration is 5.03g / L, the cobalt ion concentration is 63.4mg / L, and the aluminum ion concentration is 0.4mg / L, and the mother liquor is filtered with an ultrafiltration machine The solid particles in the nickel-cobalt-aluminum mixed solution are obtained, and the content of nickel and cobalt ions in the nickel-cobalt-aluminum mixed solution is detected;

[0071] (2) adding a certain amount of CoCl to the nickel-cobalt-aluminum mixed solution 2 crystals, and mix them evenly, adjust the molar ratio of nickel and cobalt in the mixed batch to be 85:15 to obtain a mixed batch, and the total concentration of nickel-cobalt metal ions in the mixed batch is 100 g / L;

[0072] (3) adding 3L pure water to the reaction kettle with a volume of 50L, adding the ammonium oxal...

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Abstract

The invention provides a preparation method of a Ni-Co composite oxide. The preparation method comprises the following steps of taking a mother liquid obtained through separation as a raw material after an Ni-Co-Al carbonate precursor is synthesized; adding an appropriate amount of cobalt salt according to a certain proportion; taking ammonium oxalate as a precipitant; controlling conditions such as a certain temperature and a pH value to prepare spherical Ni-Co oxalate precipitate; and carrying out calcination on the Ni-Co oxalate in a high-temperature condition to obtain the Ni-Co composite oxide with uniform granularity and high sphericity. The preparation process is simple and controllable and is low in cost, raw material waste caused by direct discharge of the mother liquid is prevented, and meanwhile, the mother liquid after solid-liquid separation of the Ni-Co oxalate precipitate still can be recycled. The invention also provides the Ni-Co composite oxide prepared according to the above preparation method. The Ni-Co composite oxide is relatively high in purity, is of a regular spherical shape, and is relatively high in sphericity and uniform in granularity, the average grain is 15-20 micrometers, the bulk density is greater than 1.5g / cm<3>, the tap density is greater than 1.8g / cm<3>, and the Ni-Co composite oxide is suitably used as a precursor of a battery material in industrial production.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, in particular to a nickel-cobalt composite oxide and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries that are increasingly playing an important role in various fields. The performance of the cathode material affects the performance of the lithium battery to a large extent, and directly determines the cost of the battery. [0003] The cathode material LiNi 1-x Co x O 2 At the same time, it has the advantages of Co-based and Ni-based cathode materials, with good electrochemical performance and thermal stability, and low material cost. It is LiCoO 2 , LiNiO 2 ideal substitute. At present, the nickel-cobalt binary precursors are mainly hydroxide systems and carbonate systems, both of which are prepared by liquid-phase co-precipitation. However, other metal ion impurities are mixed in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCY02E60/10
Inventor 张云河郭苗苗马琳乐绪清刘文泽
Owner 格林爱科(荆门)新能源材料有限公司
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