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Preparation method of cubic ternary positive electrode material precursor

A cathode material and precursor technology, which is applied in the field of new energy material preparation, can solve the problems of intensified dissolution of metal ions, fragile secondary particles, and decreased electrochemical performance, and achieves excellent stability, high compaction density, and improved pressure. The effect of solid density

Pending Publication Date: 2020-01-10
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The general morphology of conventional ternary cathode materials is generally spherical secondary particles composed of nanoparticles, which has poor structural firmness. Under high compaction, the secondary particles are easily broken, resulting in the exposure of internal particles of the material, increased side reactions, and intensified dissolution of metal ions. , the electrochemical performance decreases

Method used

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  • Preparation method of cubic ternary positive electrode material precursor
  • Preparation method of cubic ternary positive electrode material precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] NiSO 4 , CoSO 4 , MnSO 4 Prepare a nickel-cobalt-manganese mixed aqueous solution according to the molar ratio Ni:Co:Mn=5:3:2, the total concentration is 0.2 mol / L, add 0.2g CTAB (cetyltrimethylammonium bromide), and add 1.2 g urea , stirring and dissolving to obtain a translucent solution. Stand still for 24 hours, aged at 90°C for 24 hours to obtain a khaki precipitate, evaporate and crystallize at 90°C, wash and dry to obtain a cubic ternary cathode material precursor. The shape is cubic, the particle size distribution is narrow, and the compacted density is 3.71 g / cm 3 , with a specific surface area of ​​0.31 m 2 / g, such as figure 2 shown.

Embodiment 2

[0024] NiSO 4 , CoSO 4 , MnSO 4 Prepare nickel-cobalt-manganese mixed aqueous solution according to molar ratio Ni:Co:Mn=6:2:2, the total concentration is 0.15 mol / L, add 0.1g PVP (polyvinylpyrrolidone), add 0.5 g hexamethylenetetramine, Add 1g of ammonium bicarbonate, stir and dissolve to obtain a translucent solution. Stand still for 48 hours, aged at 80°C for 18 hours to obtain a khaki precipitate, evaporate and crystallize at 80°C, wash and dry to obtain a cubic ternary cathode material precursor. The shape is cubic, the particle size distribution is narrow, and the compacted density is 3.65 g / cm 3 , the specific surface area is 0.28m 2 / g.

Embodiment 3

[0026] NiSO 4 , CoSO 4 , MnSO 4 Prepare nickel-cobalt-manganese mixed aqueous solution according to the molar ratio Ni:Co:Mn=8:1:1, the total concentration is 0.5 mol / L, add 1 g SDS (sodium dodecylsulfosulfate), add 1 g hexamethylene Tetramine, add 2g of ammonium carbonate, stir and dissolve to obtain a translucent solution. Stand still for 12 hours, aged at 100°C for 12 hours to obtain a khaki precipitate, evaporate and crystallize at 100°C, wash and dry to obtain a cubic ternary cathode material precursor. The shape is cubic, the particle size distribution is narrow, and the compacted density is 3.75 g / cm 3 , with a specific surface area of ​​0.26 m 2 / g.

[0027] The tap densities and specific surface areas of the ternary cathode material precursors prepared in Examples 1 to 3 were measured respectively, and are listed in Table 1.

[0028] Table 1 is the physical and chemical performance data table of the embodiment of the present invention

[0029] Example...

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Abstract

The invention discloses a preparation method of a cubic ternary positive electrode material precursor. The ternary positive electrode material precursor with high cubic morphology compaction density and small specific surface area is synthesized by adopting static precipitation aging method, the morphology and compaction density of the precursor can be controlled by the process, the proportion ofthree metal element ions can be controlled, and complete mixed precipitation of the three metal element ions is ensured. It is ensured a ternary positive electrode material prepared from the precursorhas excellent physical and electrochemical properties, the compaction density of the ternary positive electrode material can be improved, and the industrialization process of power battery is facilitated. The material morphology and particle size can be controlled, and the method is simple, controllable and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a preparation method of a cube-shaped ternary cathode material precursor. Background technique [0002] As we all know, new energy technology bears the brunt of the emerging high-tech in the 21st century, and the battery industry, as an important part of the new energy technology field, occupies a pivotal position in global technology and economic development. Lithium-ion batteries have the advantages of high specific capacity, high energy density, high charge and discharge efficiency, good safety performance and long cycle life. The range of applications ranges from watches, mobile phones, notebook computers, and cameras to electric bicycles and electric vehicles, so it has excellent market advantages and application prospects. [0003] Cathode material is an important part of lithium-ion batteries and a key factor restricting the energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G53/06H01M4/485H01M4/505H01M4/525
CPCC01G53/006C01G53/06H01M4/505H01M4/525H01M4/485C01P2006/10C01P2006/12Y02E60/10
Inventor 胡培徐杉史德友刘世琦
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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