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Layered lithium-rich manganese-nickel-cobalt oxide positive electrode material preparation method

A lithium-rich, manganese-nickel-cobalt, positive electrode material technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of uneven chemical composition and morphology of products, unstable electrochemical performance, and many processing procedures, and achieve The effect of easy control of preparation parameters, good cycle performance, and simple process engineering

Inactive Publication Date: 2013-04-03
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the commonly used cathode materials for lithium-ion batteries, such as LiFePO 4 、LiCoO 2 , LiMn 2 o 4 The theoretical capacity of such as low (<200mAh / g), can not meet the needs of the development of power battery capacity, therefore, in recent years, the layered lithium-rich manganese nickel cobalt oxide cathode material with a capacity of up to 250mAh / g has attracted people's attention, and has been It is considered to be one of the hot candidate cathode materials for new high-capacity, high-energy-density lithium-ion batteries
At present, the most commonly used method for preparing such oxide materials is the combination of co-precipitation and solid-phase sintering. Inhomogeneity, more agglomeration, resulting in unstable electrochemical performance and poor reproducibility

Method used

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  • Layered lithium-rich manganese-nickel-cobalt oxide positive electrode material preparation method
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  • Layered lithium-rich manganese-nickel-cobalt oxide positive electrode material preparation method

Examples

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Embodiment 1

[0035] Example 1: 0.3Li 2 MnO 3 0.7LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 Preparation of cathode materials

[0036] Using lithium acetate, manganese acetate, nickel acetate, cobalt acetate and sodium hydroxide as starting materials, weigh 5.331 mmol of manganese acetate, 2.331 mmol of nickel acetate, 2.331 mmol of cobalt acetate, 13.650 mmol of lithium acetate and 70.930 mmol of sodium hydroxide. Ball mill the mixture at room temperature for 2 hours, dry the ball-milled mixture at 180°C for 4 hours to obtain off-white lumps; after grinding the off-white lumps fully, first heat treatment at 350°C for 10 hours, and then heat up to 900°C Heat treatment for 16 hours, and cool down to room temperature with the furnace to obtain a gray-black blocky substance; wash the substance with deionized water several times to obtain a residue; dry the obtained residue at 180°C for 6 hours to obtain a primary product; After the product was pressed into tablets, it was heat-treated at 500°C for 3 hour...

Embodiment 2

[0037] Example 2: 0.1Li 2 MnO 3 0.9LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 Preparation of cathode materials

[0038] Using lithium acetate, manganese acetate, nickel acetate, cobalt acetate and sodium hydroxide as starting materials, weigh 3.997mmol of manganese acetate, 2.977mmol of nickel acetate, 2.977mmol of cobalt acetate, 11.550mmol of lithium acetate and 64.620mmol of sodium hydroxide. Ball-mill the mixture at room temperature for 2 hours, dry the ball-milled mixture at 180°C for 4 hours to obtain off-white lumps; after grinding the off-white lumps fully, first heat treatment at 350°C for 10 hours, and then heat up to 900°C ℃ heat treatment for 16 hours, and cooled to room temperature with the furnace to obtain a gray-black blocky substance; the substance was washed with deionized water several times to obtain a residue; the obtained residue was dried at 180°C for 6 hours to obtain a primary product; The primary product was heat-treated at 500°C for 3 hours after tableting, th...

Embodiment 3

[0039] Example 3: 0.20Li 2 MnO 3 0.80 Li Mn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 Preparation of cathode material

[0040] Using lithium acetate, manganese acetate, nickel acetate, cobalt acetate and sodium hydroxide as starting materials, weigh 4.664mmol of manganese acetate, 2.664mmol of nickel acetate, 2.664mmol of cobalt acetate, 12.660mmol of lithium acetate and 67.776mmol of sodium hydroxide. Ball-mill the mixture at room temperature for 2 hours, dry the ball-milled mixture at 180°C for 4 hours to obtain off-white lumps; after grinding the off-white lumps fully, first heat treatment at 350°C for 10 hours, and then heat up to 900°C ℃ heat treatment for 16 hours, and cooled to room temperature with the furnace to obtain a gray-black blocky substance; the substance was washed with deionized water several times to obtain a residue; the obtained residue was dried at 180°C for 6 hours to obtain a primary product; The primary product was heat-treated at 500°C for 3 hours after tableting,...

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Abstract

The present invention relates to a layered lithium-rich manganese-nickel-cobalt oxide positive electrode material preparation method, which comprises: uniformly mixing a certain molar ratio of metal salts of lithium, manganese, nickel and cobalt, and a hydroxide, carrying out a solid phase reaction at a room temperature to obtain a nano-scale lithium-manganese-nickel hydroxide and a metal salt mixing precursor, adopting the metal salt in the precursor as a flux, heating at a high temperature, melting, and adopting the melting material as a reaction medium, such that the precursor is subjected to complete contact mixing and diffusion in the flux so as to achieve a rapid reaction purpose, and the layered lithium-rich manganese-nickel-cobalt oxide positive electrode material xLi2MnO3.(1-x)LiMO2 is prepared, wherein M is Mn1-(y+z)NiyCoz, x is 0.1-1.0, y is 0.1-0.5, and z is 0.1-0.5. Compared to the gas protection coprecipitation method, the sol-gel method and other methods commonly used for preparing the layered lithium-rich manganese-nickel-cobalt oxide positive electrode material, the method of the present invention has advantages of easy operation, practical process, good safety, low cost, high material purity, excellent electrochemistry performance, and the like.

Description

technical field [0001] The invention relates to a method for preparing a layered lithium-rich manganese-nickel-cobalt oxide cathode material in the field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high capacity, long cycle life, good safety performance, and environmental protection, and have been widely used in portable electronic equipment, power devices, aerospace, space technology and other fields. In recent years, the application in the fields of electric hardware tools, other consumer electronics products, light electric vehicles and electric vehicles has injected new high-speed growth momentum into the lithium battery industry, especially for large lithium-ion batteries for energy storage and vehicles. The battery market provides a broad space for the future development of lithium-ion batteries. For power batteries, the development of lithium-ion batteries with high energy density and high power d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 李莉萍余创关翔锋李广社
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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