High capacity solid solution composite positive electrode material preparation method

A composite positive electrode material and composite material technology are applied in the field of preparation of high-capacity solid solution composite positive electrode materials, which can solve the problems of many processing procedures, cumbersome operations, low theoretical capacity, etc., and achieve simple process engineering, simple equipment, and accelerated ion diffusion. Effect

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

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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 is low (<200mAh / g), which cannot meet the needs of the development of power battery capacity. Therefore, in recent years, the solid solution composite cathode material with a capacity of 200-250mAh / g has attracted people's attention and is considered to be a new type of high-efficiency battery. One of the hot candidate cathode materials for lithium-ion batteries with high capacity and high energy density
At present, the most commonly used method for preparing such solid solution materials is the combination of co-precipitation and solid-phase sintering, which is cumbersome to operate and has many processing procedures.

Method used

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  • High capacity solid solution composite positive electrode material preparation method
  • High capacity solid solution composite positive electrode material preparation method
  • High capacity solid solution composite positive electrode material preparation method

Examples

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Effect test

Embodiment 1

[0033] Example 1: 0.3Li 2 MnO 3 0.7LiMn 0.5 Ni 0.5 o 2 Preparation of cathode material

[0034]Lithium acetate, manganese acetate, nickel acetate, and sodium hydroxide were used as starting materials, and 6.5 mmol of manganese acetate, 3.5 mmol of nickel acetate, 13.4 mmol of lithium acetate, and 70.2 mmol of sodium hydroxide were weighed. 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 hours, then heated to 900°C for 16 hours, and final...

Embodiment 2

[0035] Example 2: 0.1Li 2 MnO 3 0.9LiMn 0.5 Ni 0.5 o 2 Preparation of cathode material

[0036] Lithium acetate, manganese acetate, nickel acetate, and sodium hydroxide were used as starting materials, and 5.5 mmol of manganese acetate, 4.5 mmol of nickel acetate, 11.3 mmol of lithium acetate, and 64.0 mmol of sodium hydroxide were weighed. 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 is pressed into tablets, it is heat-treated at 500°C for 3 hours, then heated up to 900°C for 16 hours, and fin...

Embodiment 3

[0037] Example 3: 0.2Li 2 MnO 3 0.8LiMn 0.5 Ni 0.5 o 2 Preparation of cathode material

[0038] Lithium acetate, manganese acetate, nickel acetate, and sodium hydroxide were used as starting materials, and 6.0 mmol of manganese acetate, 4.0 mmol of nickel acetate, 12.3 mmol of lithium acetate, and 66.9 mmol of sodium hydroxide were weighed. 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 hours, then heated to 900°C for 16 hours, and fina...

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Abstract

The present invention relates to a high capacity solid solution composite positive electrode material preparation method, wherein a metal salt and a hydroxide are subjected to a solid phase reaction at a room temperature to obtain a nano-scale precursor, and then the metal salt in the precursor is adopted as a flux in the subsequent heat treatment process, 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 solid solution composite positive electrode material xLi2MnO3.(1-x)LiMn0.5Ni0.5O2 is finally prepared, wherein x is 0.1-1.0. According to the present invention, lithium ion battery production products produced by using the solid solution composite positive electrode materials have stable electrochemistry performance, stable cycle performance and good reproducibility; and the preparation method has advantages of easy operation, practical process, good safety, low cost, high product material purity, excellent electrochemical performance and the like.

Description

technical field [0001] The invention relates to a method for preparing a high-capacity solid solution composite positive electrode 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, and good safety performance, making them have broad application prospects in portable electronic devices, electric vehicles, space technology and other fields. The development of lithium-ion batteries with high energy density and high power density is a current research hotspot. 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 is low (<200mAh / g), which cannot meet the needs of the development of power battery capacity. Therefore, in recent years, the solid solution composite cathode material with a capacity of 200-250mAh / g has attracted people's attention and is considered to be a ...

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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