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A kind of nickel-cobalt-manganese ternary precursor and preparation method thereof

A nickel-cobalt-manganese ternary, nickel-cobalt-manganese technology, applied in electrical components, structural parts, battery electrodes, etc., can solve the problems of reduced material volume energy density, low secondary ball tap density, cracking, etc., and achieve particle crushing. Small proportion, avoid product cracking, enhance the effect of mechanical properties

Active Publication Date: 2021-08-03
兰州金通储能动力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the subsequent process of mixing lithium to prepare positive electrode materials, ball mills, high-mixers and tablet presses will also cause secondary ball cracking risks, so that the ternary precursor loses the advantage of inheriting the performance of spheres, and further negatively affects the electrochemical performance of positive electrode materials. influences
The primary particles of the α-type ternary precursor are mostly sheet-like structures, and the secondary spheres formed by accumulating from this have a low tap density and a large specific surface area, resulting in a decrease in the volume energy density of the material

Method used

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  • A kind of nickel-cobalt-manganese ternary precursor and preparation method thereof
  • A kind of nickel-cobalt-manganese ternary precursor and preparation method thereof
  • A kind of nickel-cobalt-manganese ternary precursor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The 2mol / L nickel-cobalt-manganese mixed nitrate solution and the 4mol / L ammonium nitrate solution are started to add liquid through the metering pump at a constant speed and parallel flow, and the molar coefficient ratio of the metal nickel-cobalt-manganese in the raw material is 70:15 : 15; add 8mol / L sodium hydroxide solution at the same time to control the pH value of the process to be 12±0.1; feed nitrogen protection during the feeding process, and control the ammonia concentration in the reaction solution at about 1.5mol / L, the stirring speed at 400 rpm and the reaction device The temperature is around 50°C. The material process D(50) is monitored in real time during the reaction, and the reaction is suspended when it reaches about 7 μm.

[0028] (2) Adjust the temperature of the reaction device to 90°C, and after stirring for 2 hours, add an appropriate amount of dilute nitric acid to adjust the pH value to 10.

[0029] (3) A mixture of carbon dioxide and ox...

Embodiment 2

[0033](1) The 2mol / L nickel-cobalt-manganese mixed nitrate solution and the 4mol / L ammonium nitrate solution are started to add liquid through the metering pump at a constant speed and parallel flow, and the molar coefficient ratio of the metal nickel-cobalt-manganese in the raw material is 70:15 : 15; add 8mol / L sodium hydroxide solution at the same time to control the pH value of the process to be 12±0.1; feed nitrogen protection during the feeding process, and control the ammonia concentration in the reaction solution at about 1.5mol / L, the stirring speed at 400 rpm and the reaction device The temperature is around 50°C. During the reaction process, the material process D(50) is monitored in real time, and the reaction is suspended when it reaches about 6 μm.

[0034] (2) Adjust the temperature of the reaction device to 90°C, and after stirring for 2 hours, add an appropriate amount of dilute nitric acid to adjust the pH value to 10.

[0035] (3) A mixture of carbon dioxid...

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Abstract

A nickel-cobalt-manganese ternary precursor and a preparation method thereof, characterized in that: the particles of the nickel-cobalt-manganese ternary precursor have a core-shell structure, the core is a β-type nickel-cobalt-manganese hydroxide, and the shell is an α-type nickel-cobalt-manganese hydroxide. The nickel-cobalt-manganese mixed solution and the complexing agent solution are added to the reaction device, the pH of the reaction solution is controlled to be 11.5-12.5, the reaction temperature is 45-65°C, and the nucleus of the nickel-cobalt-manganese ternary precursor is prepared in a nitrogen atmosphere; the reaction temperature is adjusted to 85~95°C, adjust the pH of the reaction solution to 9.5~10.5; pass in the mixed gas of carbon dioxide and oxygen, add the mixed solution of nickel, cobalt and manganese, control the pH of the reaction solution to 9.5~10.5, and prepare nickel, cobalt, manganese The shell of the element precursor; post-processing to obtain the nickel-cobalt-manganese ternary precursor. The nickel-cobalt-manganese ternary precursor with a core-shell structure prepared by the invention can greatly improve the physical properties of the secondary ball while ensuring a high tap density of the product.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nickel-cobalt-manganese ternary precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries have rapidly developed into a research hotspot since the end of the last century, and have been widely recognized in the fields of electronic communications and vehicle batteries. The positive electrode material of the battery accounts for more than 25% of the total cost of the battery, which directly affects the performance of the battery capacity, cycle and safety, and is the key core of all battery components. The cathode materials currently occupying the lithium battery market mainly include lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate. Lithium cobalt oxide materials are mostly used in small high-end electronic equipment, which has high cost and has certain hidden dangers of overchar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 朱用王梁梁王树亮许翔袁超群褚风辉李佰康朱涛
Owner 兰州金通储能动力新材料有限公司