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Preparation method of nickel-cobalt-aluminum ternary material precursor with core-shell structure

A ternary material, shell-core structure technology, applied in structural parts, electrical components, nickel oxide/nickel hydroxide and other directions, can solve the problems of low tap density, large difference in precipitation pH value, poor precipitation effect, etc. The effect of good stability and high crystallinity of the material

Pending Publication Date: 2018-06-01
SHAANXI COAL & CHEM TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of poor co-precipitation effect and low tap density of nickel, cobalt and aluminum due to 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 nickel-cobalt-aluminum shell-core structure The preparation method of the hydroxide precursor effectively improves the tap density of the precursor and the sphericity of the particles

Method used

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  • Preparation method of nickel-cobalt-aluminum ternary material precursor with core-shell structure
  • Preparation method of nickel-cobalt-aluminum ternary material precursor with core-shell structure

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preparation example Construction

[0027] A preparation method of a core-shell structure nickel-cobalt-aluminum ternary material precursor, comprising the following steps:

[0028] Step 1: Dissolve nickel and cobalt soluble salts in deionized water in proportion, and flow them together with complexing agent A solution and precipitating agent solution into the reaction kettle equipped with bottom liquid, and set the flow rate, reaction temperature and reaction pH of each solution value and reaction time, the set reaction temperature is 45-75°C, the reaction pH value is 10.5-12.8, and the reaction time is 0.5-40h; preferably, the reaction temperature is 55-65°C, the reaction pH value is 10.8-11.8, and the reaction The time is 1-20h, forming the core structure of the material;

[0029] Among them, nickel and cobalt soluble salts include one or more of sulfate, nitrate, acetate and chloride; complexing agent A is ammonia, triethanolamine, ammonium fluoride, citric acid, oxalic acid, ethylenediamine One or several ...

Embodiment 1

[0035] Step one: configuration total metal concentration is the aqueous sulfate solution of 2mol / L nickel-cobalt, the mol ratio of nickel-cobalt is 85:13, the complexing agent A ammoniacal solution of 5.7mol / L, the sodium hydroxide solution of 4mol / L, and Add the flow into a 100L reactor whose bottom liquid is 0.3mol / L ammonia water, set the reaction temperature at 60°C, the reaction pH value at 11.5, and the reaction time for 3 hours to form the nuclear structure of the material;

[0036] Step 2: Continue the reaction in step 1, configure 0.1mol / L sodium metaaluminate aqueous solution, add it into the reaction kettle at a rate of 25mL / min, set the reaction temperature to 60°C, the reaction pH value to 11.5, and the reaction time 45h, the precipitates of nickel, cobalt and aluminum continue to grow on the core structure formed by nickel-cobalt hydroxide to form the shell structure of the material;

[0037]Step 3: Aging the product obtained in step 2 for 48 hours, centrifuging ...

Embodiment 2

[0039] Step one: configuration total metal concentration is the nitric acid aqueous solution of 2mol / L nickel-cobalt, the mol ratio of nickel-cobalt is 82:15, the complexing agent A sodium edetate solution of 0.1mol / L, the hydroxide of 10mol / L Sodium solution, and flow into the reaction kettle whose bottom liquid is 0.2mol / L ammonia water, set the reaction temperature to 45°C, the reaction pH value to 10.5, and the reaction time to 20h to form the nuclear structure of the material;

[0040] Step 2: The reaction in step 1 is continued, and the sodium metaaluminate solution of 0.01mol / L is configured, wherein the sodium metaaluminate solution is a mixture of sodium metaaluminate and 1.8 times complexing agent B sodium citrate dissolved in deionized Formed in water, added to the reaction kettle, set the reaction temperature to 45°C, the reaction pH value to 10.5, and the reaction time to 10 hours, so that the precipitates of nickel, cobalt, and aluminum continue to grow on the cor...

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Abstract

The invention discloses a preparation method of a nickel-cobalt-aluminum ternary material precursor with a core-shell structure. The preparation method comprises the following steps: firstly, dissolving nickel soluble salt and cobalt soluble salt proportionally in deionized water to obtain a nickel-cobalt solution, and adding the nickel-cobalt solution, a complex agent A solution and a precipitantsolution together to a reactor filled with a base solution to perform reaction to form a core structure of the nickel-cobalt-aluminum ternary material precursor, wherein the core structure is nickel-cobalt hydroxide; secondly, adding a sodium metaaluminate solution, the nickel-cobalt solution, the complex agent A solution and the precipitant solution together to the reactor after the reaction isfinished to perform reaction to enable precipitates of nickel, cobalt and aluminum to form a shell structure of the nickel-cobalt-aluminum ternary material precursor on the core structure, wherein theshell structure is nickel-cobalt-aluminum hydroxide; and finally, performing aging, liquid-solid separation, washing and drying on the obtained product to obtain the nickel-cobalt-aluminum ternary material precursor with the core-shell structure.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of a precursor of a core-shell structure nickel-cobalt-aluminum ternary material. 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 prospe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/48H01M10/0525C01G53/04
CPCH01M4/366H01M4/48H01M4/525H01M10/0525C01G53/04C01P2002/85C01P2004/03C01P2004/82Y02E60/10
Inventor 寇亮张诚张超王夏阳田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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