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A kind of method for preparing nickel cobalt lithium manganese oxide

A technology of nickel-cobalt lithium manganate and lithium cobalt manganate is applied to the preparation of positive electrode materials for lithium ion batteries and the field of preparation of nickel-cobalt lithium manganate, which can solve the problems of irregular crystal morphology, low cost and uneven particle distribution. , to achieve the effect of high morphology and structure consistency, consistent morphology and structure, and uniform particle size.

Active Publication Date: 2015-12-02
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method has a simple process and low cost, but the particle distribution is uneven and the crystal morphology is irregular; the co-precipitation method is relatively simple, but the uniformity of the phase is not easy to control; During the process, a lot of gas and organic matter will escape, and shrinkage will occur, making the shape and size inconsistent

Method used

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  • A kind of method for preparing nickel cobalt lithium manganese oxide
  • A kind of method for preparing nickel cobalt lithium manganese oxide
  • A kind of method for preparing nickel cobalt lithium manganese oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Polish the aluminum foil with a thickness of 0.5mm with 50-mesh sandpaper to make the surface of the aluminum foil smooth, which is conducive to the formation of an orderly porous template, soak it in acetone for 30min, wash it with deionized water, and heat it to 100°C under nitrogen , keep 1h.

[0040] (2) Use aluminum foil as anode, graphite rod as cathode, calomel electrode as reference electrode, and 0.1mol / L acetic acid solution as electrolyte. Electrochemically polish for 3 minutes at room temperature and 4V voltage. After taking it out, use deionized water Wash and dry for later use.

[0041] (3) Using polished aluminum foil as anode, graphite rod as cathode, calomel electrode as reference electrode, 0.1mol / L sulfuric acid as electrolyte, ice-water bath (about 0°C), 20V voltage, electrochemical oxidation for 1h.

[0042] (4) After taking out, cleaning and drying the primary oxidized aluminum foil, soak it in the mixed solution of acetic acid and phosphoric ...

Embodiment 2

[0051] (1) Polish the aluminum foil with a thickness of 0.5mm with 50-mesh sandpaper, soak it in alcohol for 30min, wash it with deionized water, heat it to 150°C under nitrogen, and keep it for 1.5h.

[0052] (2) Aluminum foil is used as anode, graphite rod is used as cathode, calomel electrode is used as reference electrode, 0.15mol / L acetic acid is used as electrolyte, at room temperature, 5V voltage, electrochemical polishing for 4min, after taking it out, wash it with deionized water Dry and set aside.

[0053] (3) Using polished aluminum foil as anode, graphite rod as cathode, calomel electrode as reference electrode, 0.2mol / L tartaric acid as electrolyte, ice water bath, 25V voltage, electrochemical oxidation for 1.5h.

[0054] (4) Take out the primary oxidized aluminum foil, wash it, and dry it, then soak it in a solution of 0.75mol / L acetic acid and 0.15mol / L phosphoric acid, the volume of the solution is 5.5mL, and soak at 45°C for 45min.

[0055] (5) Using the prim...

Embodiment 3

[0062] (1) Polish the aluminum foil with a thickness of 0.5mm with 50-mesh sandpaper, soak it in acetone for 30min, wash it with deionized water, heat it to 200°C under nitrogen, and keep it for 2h.

[0063] (2) Use aluminum foil as anode, graphite rod as cathode, calomel electrode as reference electrode, and 0.2mol / L acetic acid as electrolyte. Electrochemically polish for 5 minutes at room temperature and voltage of 6V. After taking it out, wash it with deionized water Dry and set aside.

[0064] (3) Using polished aluminum foil as anode, graphite rod as cathode, calomel electrode as reference electrode, 0.3mol / L phosphoric acid as electrolyte, ice-water bath (about 0°C), 30V voltage, electrochemical oxidation for 2h.

[0065] (4) Take out, wash and dry the primary oxidized aluminum foil, soak it in a solution consisting of 1 mol / L acetic acid and 0.2 mol / L phosphoric acid, the volume of the solution is 6 mL, and soak at 50°C for 1 hour.

[0066] (5) Use the primary oxidize...

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Abstract

The invention relates to a preparation method of nickel cobalt lithium manganate. A sol-gel method and a porous alumina template method are combined to prepare a nickel cobalt lithium manganate material characterized by uniform particle size, consistent appearance and structure, and stable and excellent performance. The method includes the steps of: subjecting an aluminum foil to frosting, soaking, washing and heat treatment in a nitrogen atmosphere, then conducting electrochemical polishing treatment; taking the polished aluminum foil as an anode, and adopting a twice anode oxidation method to prepare a porous alumina template; preparing a sol containing a nickel source, a cobalt source, a manganese source and a lithium source in certain proportion, and soaking the porous alumina template in the sol, then taking it out, and sintering it repeatedly under certain conditions; and finally, soaking the nickel cobalt lithium manganate loaded porous alumina into an alkaline solution, carrying out filtering, washing, evaporative crystallization, and ball-milling screening, thus obtaining the nickel cobalt lithium manganate product. The method is simple and feasible to operate, and can effectively control the appearance, structure and size of crystals, thus providing a new approach for preparation of the high-performance nickel cobalt lithium manganate material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a preparation method of a lithium ion battery cathode material, in particular to a method for preparing nickel-cobalt lithium manganese oxide. Background technique [0002] Lithium-ion battery is a new type of green and environment-friendly power supply, which has the advantages of high energy density and high discharge platform, and is widely used in electronic products such as mobile phones, cameras, and notebook computers. With the continuous development of the digital product industry, people's demand for batteries is increasing. Lithium nickel cobalt manganese oxide is an important cathode material for lithium batteries, which is increasingly widely produced and used, and has a large market demand. [0003] The positive electrode material of lithium battery is an important part of lithium battery and the main factor affecting the performance of lithium battery. The curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48
CPCH01M4/505H01M4/525Y02E60/10
Inventor 欧彦楠李长东余海军
Owner GUANGDONG BRUNP RECYCLING TECH
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