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High-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material, and preparation methods therefor

A positive electrode material and co-doping technology, applied in the direction of electrical components, battery electrodes, circuits, etc., to achieve the effects of maintaining stability, reducing mixing, and high tap density

Inactive Publication Date: 2017-07-04
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is currently no information about Li(Ni x co y Mg z )O 2 Especially the patent document report of high nickel (x≥85%) material, therefore develop a kind of simple preparation technology suitable for large-scale production, and prepare the high nickel Li(Ni x co y Mg z )O 2 It has important significance and application prospects

Method used

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  • High-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material, and preparation methods therefor
  • High-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material, and preparation methods therefor
  • High-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material, and preparation methods therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step (1): Prepare transition metal ion solution with a concentration of 0.5mol L -1 , wherein the nickel-cobalt-magnesium salt is a mixture of nickel sulfate, cobalt sulfate, and magnesium sulfate, and the molar ratio of nickel ions, cobalt ions, and magnesium ions is 0.89:0.05:0.06. The concentration of ammonia water is 2mol L -1 , the concentration of sodium hydroxide is 2mol L -1 The concentration of the mixed solution and sodium hydroxide is 1mol L -1 The solution. Place the above three solutions on a stirrer and stir fully to dissolve the solute completely.

[0034] Step (2): Add 300ml of deionized water to the sealed reaction kettle, and set the stirring speed of the stirring paddle to 650rpm·min -1 , control the temperature of the system at 40°C, drop an appropriate amount of concentrated ammonia water to initially adjust the pH, and then adjust the pH to 10.5 with sodium hydroxide solution. After the system was stabilized, the transition metal ion solution,...

Embodiment 2

[0038] Step (1): Prepare transition metal ion solution with a concentration of 3mol L -1 , wherein the nickel-cobalt-magnesium salt is a mixture of nickel chloride, cobalt chloride, and magnesium chloride, and the molar ratio of nickel ions, cobalt ions, and magnesium ions is 0.9:0.05:0.05. The concentration of ammonia water is 0.5mol L -1 , the concentration of sodium hydroxide is 0.5mol L -1 The concentration of the mixed solution and sodium hydroxide is 4mol L -1 The solution. Place the above three solutions on a stirrer and stir fully to dissolve the solute completely.

[0039] Step (2): Add 300ml of deionized water to the sealed reaction kettle, and set the stirring speed of the stirring paddle to 800rpm·min -1 , control the temperature of the system at 50°C, drop an appropriate amount of concentrated ammonia water to initially adjust the pH, and then adjust the pH to 10.8 with sodium hydroxide solution. After the system was stabilized, the transition metal ion solut...

Embodiment 3

[0043] Step (1): Prepare transition metal ion solution with a concentration of 1mol L -1 , wherein the nickel-cobalt-magnesium salt is a mixture of nickel sulfate, cobalt sulfate, and magnesium sulfate, and the molar ratio of nickel ions, cobalt ions, and magnesium ions is 0.85:0.1:0.05. The concentration of ammonia water is 3mol L -1 , the concentration of sodium hydroxide is 3mol L -1 The concentration of the mixed solution and sodium hydroxide is 2mol L -1 The solution. Place the above three solutions on a stirrer and stir fully to dissolve the solute completely.

[0044] Step (2): Add 300ml of deionized water to the sealed reaction kettle, and set the stirring speed of the stirring paddle to 750rpm·min -1 , control the temperature of the system at 50°C, drop an appropriate amount of concentrated ammonia water to initially adjust the pH, and then adjust the pH to 10.6 with sodium hydroxide solution. After the system was stabilized, the transition metal ion solution, am...

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Abstract

The invention relates to a high-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material, and preparation methods therefor. The chemical formula of the high-nickel-material-based cobalt-magnesium co-doped modified positive electrode material is Li(Ni<x>Co<y>Mg<z>)O<2>, wherein x+y+z is equal to 1; x is greater than or equal to 0.85; y is greater than or equal to 0.05 and less than or equal to 0.14; z is greater than or equal to 0.01 and less than or equal to 0.1; and the positive electrode material belongs to the field of an electrode material of a lithium ion battery. A nickel-cobalt-magnesium mixed solution, a mixed solution of ammonium hydroxide and sodium hydroxide, and a sodium hydroxide solution are in parallel flow and are added to a reaction kettle to be subjected to a coprecipitation reaction to obtain precursor powder; then the nickel-cobalt-magnesium ternary positive electrode material is obtained; the non-electrochemical active Mg<2+> has a ''supporting column stabilizing effect'', and can stabilize a layered structure, reduce mixed arrangement of Ni<2+> and Li<+> and effectively improve the structural stability and electrochemical performance of the material; and the high-nickel-material-based cobalt-magnesium co-doped modified ternary precursor and positive electrode material have the advantages of simple operation, continuous batch production, high discharging capacity, high cycling performance and the like, as well as high economic value and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a method for preparing a co-doped and modified ternary precursor based on high-nickel materials and a positive electrode material Background technique [0002] As a new generation of environmentally friendly and high-energy batteries, lithium-ion batteries have the advantages of high voltage, large capacity, no memory effect, and long life. They are widely used in electronic products such as mobile phones, digital cameras, and notebooks, and have become one of the key points in the development of the battery industry. . With the development of hybrid electric vehicles, pure electric vehicles and large energy storage devices, higher requirements are put forward for the next generation of lithium-ion batteries in terms of energy density, rate performance and cycle life. In lithium-ion batteries, the cathode material is an important component that de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 程方益周朋飞李航李海霞陈军
Owner NANKAI UNIV
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