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Preparation method of aluminum oxide-coated positive electrode material for lithium-ion battery

A lithium-ion battery and cathode material technology, which is applied in the field of preparation of alumina-coated lithium-ion battery cathode materials, can solve problems such as flammability, influence of material structure and electrochemical performance, and volatile organic solvents, so as to avoid potential safety hazards , Improve cycle performance, simple and controllable process

Inactive Publication Date: 2017-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the modification of ternary materials is mainly surface coating. The existing coating methods are usually carried out directly on the material, mainly in organic solvents such as ethanol and propanol, but organic solvents are volatile and flammable. On the other hand, because the high-nickel layered oxide cathode material is very sensitive to water in the environment, soaking in water will have an impact on the structure and electrochemical properties of the material, while the precursor material is produced in aqueous solution. Therefore, if the coating in aqueous solution can be achieved, the electrochemical performance of the material can be further improved

Method used

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  • Preparation method of aluminum oxide-coated positive electrode material for lithium-ion battery
  • Preparation method of aluminum oxide-coated positive electrode material for lithium-ion battery
  • Preparation method of aluminum oxide-coated positive electrode material for lithium-ion battery

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Embodiment 1

[0035] A kind of preparation method of aluminum oxide coating lithium ion battery cathode material of the present invention, its specific preparation process is as follows:

[0036] 10g Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor was dispersed with 80ml of deionized water, and the process was supplemented by stirring, and the stirring was stopped after 30 minutes. Dissolve 0.5184g of sodium metaaluminate in 20ml of deionized water according to the coating amount of alumina and 3wt% of the mass coating amount, and mix it with the previously dispersed precursor slurry, and at the same time, introduce CO into the system 2 , stirred at 70±5°C for 120min, washed and filtered, and dried in an 80°C blast drying oven for 12-15h to obtain Al(OH) 3 Coated lithium ion battery cathode material precursor. By performing SEM detection on the coated precursor material, the SEM spectra of the hydroxide precursor before and after coating are as follows image 3 shown. Depend on image 3 I...

Embodiment 2

[0038] A kind of preparation method of aluminum oxide coating lithium ion battery cathode material of the present invention, its specific preparation process is as follows:

[0039] The commercial layered high-nickel material Ni0.75 co 0.1 mn 0.15 (OH) 2 For coating object, coat with reference to the method for embodiment 1: with 10gNi 0.75 co 0.1 mn 0.15 (OH) 2 The material was placed in 80ml of deionized water and stirred to disperse, and after 30min, press Al 2 o 3 The mass coating amount is 3wt% to calculate and prepare sodium metaaluminate solution, mix the two, place in a water bath at 70±5°C and pass CO 2 gas, after stirring for 120min to obtain Al(OH) 3 The coated precursor material is washed and filtered, dried in an oven at 80°C and then mixed with lithium for sintering. The temperature system of the sintering process is two-stage heating in an oxygen atmosphere, pre-sintering at 480°C for 300 minutes, and then heating to 780°C for sintering for 900 minutes ...

Embodiment 3

[0041] A kind of preparation method of aluminum oxide coating lithium ion battery cathode material of the present invention, its specific preparation process is as follows:

[0042] The commercial layered high-nickel material Ni 0.6 co 0.2 mn 0.2 (OH) 2 For coating object, coat with reference to the method for embodiment 1: with 10g Ni 0.6 co 0.2 mn 0.2 (OH) 2 The material was placed in 80ml of deionized water and stirred to disperse, and after 30min, press Al 2 o 3 The mass coating amount is 3wt% to calculate and prepare sodium metaaluminate solution, mix the two, place in a water bath at 70±5°C and pass CO 2 gas, after stirring for 120min to obtain Al(OH) 3 The coated precursor material is washed and filtered, dried in an oven at 80°C and then mixed with lithium for sintering. The temperature system of the sintering process is two-stage heating in an oxygen atmosphere, pre-sintering at 480°C for 300 minutes, and then heating to 780°C for sintering for 900 minutes ,...

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Abstract

The invention discloses a preparation method of an aluminum oxide-coated positive electrode material for a lithium-ion battery. The method comprises the following steps of (1) adding water to a hydroxide precursor of a positive electrode material for stirring to obtain positive electrode material precursor slurry; (2) dissolving sodium metaaluminate into water to obtain an aluminum salt solution; (3) adding the aluminum salt solution to the positive electrode material precursor slurry, stirring and introducing CO2 to obtain an aluminum hydroxide-coated positive electrode material precursor; (4) filtering, washing and drying slurry of the aluminum hydroxide-coated positive electrode material precursor to obtain aluminum hydroxide-coated positive electrode material precursor powder; (5) mixing the aluminum hydroxide-coated positive electrode material precursor powder with a lithium salt to obtain mixed powder; and (6) carrying out thermal treatment on the mixed powder to obtain the aluminum oxide-coated positive electrode material for the lithium-ion battery. The method is carried out in a water solution, an organic solvent is not used, and the discharge capacity and the cycle efficiency of the lithium-ion battery are improved through the method.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a preparation method of aluminum oxide-coated lithium-ion battery cathode materials. Background technique [0002] Due to the advantages of high energy density and long cycle life, lithium-ion batteries are not only used in portable electronic devices, but also in large-scale energy storage devices such as electric vehicles and hybrid vehicles. The demand for lithium-ion batteries is also increasing. widely. Layered transition metal oxide is currently the most widely used anode material for lithium-ion batteries. It combines the advantages of lithium nickelate, lithium cobaltate and lithium manganate, and overcomes the high price of lithium cobaltate. , toxicity and other disadvantages, it has greater advantages in terms of cost and safety performance. In particular, high-nickel materials have large reversible capacity and high energy density. [0...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/628H01M2220/20Y02E60/10
Inventor 王志兴董明霞李新海郭华军赵俊楷
Owner CENT SOUTH UNIV
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