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Ternary cathode material precursor adopting core-shell structure

A cathode material and core-shell structure technology, applied in the field of ternary cathode material precursors, can solve the problems of large pH value difference, low tap density and low sphericity of the precursor, and achieve high tap density and sphericity High, predictable results

Pending Publication Date: 2018-05-29
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low tap density and low sphericity of the nickel-cobalt-aluminum ternary material precursor caused by the large difference in precipitation pH value of nickel, cobalt and aluminum and the excessive precipitation of aluminum, the purpose of the present invention is to provide a shell core Structured nickel-cobalt-aluminum hydroxide precursor, which can effectively improve the tap density of the precursor and the sphericity of the particles

Method used

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  • Ternary cathode material precursor adopting core-shell structure

Examples

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Embodiment 1

[0020] Configure an aqueous solution of nickel-cobalt salt, the molar ratio of nickel-cobalt is 85:13, put it into a 100L reaction kettle in parallel with ammonia solution and sodium hydroxide solution, and react at 60°C for 30h; then add the prepared solution to the reaction kettle The sodium metaaluminate solution, continue to react for 50h, make the precipitates of nickel, cobalt and aluminum continue to grow on the nuclear structure formed by nickel-cobalt hydroxide; the nuclear structure forming the precursor is nickel-cobalt hydroxide, The shell structure is nickel-cobalt-aluminum hydroxide, the nickel in the core structure is 50% of the total nickel mass, the cobalt in the core structure is 50% of the total cobalt mass, and the molar ratio of nickel, cobalt, and aluminum in the precursor is 85 :13:2, the tap density of the precursor is 2.3g / cm 3 , particle size D 50 The particle size of the nickel cobalt hydroxide core is 12 μm, and the particle size is 7 μm.

[0021]...

Embodiment 2

[0023] Configure an aqueous solution of nickel-cobalt salt, the molar ratio of nickel-cobalt is 82:15, put it into a 100L reaction kettle in parallel with ammonia solution and sodium hydroxide solution, and react at 60°C for 60h; then add the prepared solution to the reaction kettle The sodium metaaluminate solution, continue to react for 20h, make the precipitates of nickel, cobalt, aluminum continue to grow on the nuclear structure formed by nickel-cobalt hydroxide; the nuclear structure of the precursor is nickel-cobalt hydroxide, The shell structure is nickel-cobalt-manganese hydroxide, the core structure contains 80% of the total nickel mass, and the core structure contains 80% of the total cobalt mass. The molar ratio of nickel, cobalt, and manganese in the precursor is 82 :15:3, the tap density of the precursor is 2.1g / cm 3 , particle size D 50 is 20 μm.

[0024] The scanning electron microscope picture of described nickel-cobalt-manganese precursor is as figure 2 s...

Embodiment 3

[0026] Configure an aqueous solution of nickel-cobalt salt, the molar ratio of nickel-cobalt is 80:10, put it into a 100L reaction kettle in parallel with ammonia solution and sodium hydroxide solution, and react at 60°C for 3 hours; then add the prepared solution to the reaction kettle The sodium metaaluminate solution, continue to react for 77h, make the precipitates of nickel, cobalt and aluminum continue to grow on the nucleus structure formed by nickel-cobalt hydroxide; the nucleus structure forming the precursor is nickel-cobalt hydroxide, The shell structure is nickel-cobalt-aluminum hydroxide, the nickel in the core is 5% of the total nickel mass, the cobalt in the core is 5% of the total cobalt mass, and the molar ratio of nickel, cobalt, and aluminum in the precursor is 80:10 :10, the precursor tap density is 1.8g / cm 3 , particle size D 50 The particle size of the nickel-cobalt hydroxide core is 6 μm.

[0027] The nickel-cobalt-aluminum ternary material precursor i...

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Abstract

The invention discloses a ternary cathode material precursor adopting a core-shell structure. A core structure of the ternary cathode material precursor is a nickel-cobalt hydroxide, a shell structureis nickel-cobalt-aluminum hydroxide or nickel-cobalt-manganese hydroxide, wherein the mass of nickel in the core structure is 5%-80% of the total mass of nickel in the ternary cathode material precursor, and the mass of cobalt in the core structure is 5%-80% of the total mass of cobalt in the ternary cathode material precursor. The tap density of the precursor and the degree of sphericity of particles can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a precursor of a ternary cathode material with a core-shell structure. Background technique [0002] The structure of a lithium-ion battery includes a positive electrode, a negative electrode, a diaphragm, and an electrolyte. The positive and negative electrodes are soaked in the electrolyte, and lithium ions move between the positive and negative electrodes using the electrolyte as a medium to realize the charge and discharge of the battery. Due to its high working voltage, large specific energy, light weight, small size, long cycle life, no memory effect, fast charge and discharge, and no environmental pollution, as a new generation of green high-energy batteries, it is widely used in various 3C products and new products. Energy-powered vehicles are widely used and have broad market prospects. The current research hotspots mainly...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525C01G53/006C01P2004/03C01P2004/61C01P2004/84C01P2006/11Y02E60/10
Inventor 张诚寇亮王夏阳张超田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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