Lithium ion positive electrode material cladded by nanometer alumina membrane and preparation method thereof

A nano-alumina, cathode material technology, applied in the field of materials, can solve the problems of reduced material charge and discharge efficiency, reduced material crystallization performance, and poor cathode material performance, and achieves stable diffusion rate, uniform coating, and improved cycle performance. Effect

Active Publication Date: 2014-01-15
HENAN KELONG NEW ENERGY CO LTD
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Problems solved by technology

[0003] The performance of the cathode material in lithium-ion batteries has an important impact on the performance of lithium-ion batteries. The currently used ternary material LiNi x co y mn 1-x-y o 2 , 0.4≤x≤0.9,0.1

Method used

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  • Lithium ion positive electrode material cladded by nanometer alumina membrane and preparation method thereof
  • Lithium ion positive electrode material cladded by nanometer alumina membrane and preparation method thereof
  • Lithium ion positive electrode material cladded by nanometer alumina membrane and preparation method thereof

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Effect test

Embodiment 1

[0023] 50g of LiNi with an average particle size of 10um 0.5 co 0.2 mn 0.3 o 2 Mix the positive electrode material with the deionized aqueous solution with a concentration of 0.3M sodium bicarbonate evenly, then slowly add the aluminum chloride solution with a concentration of 0.08M into the mixed solution of the positive electrode material, control the temperature at 50°C, and keep stirring, while adding Adjust the pH value of the solution to 8.5 with an appropriate amount of ammonia water, stir for 30 minutes, then stand still for 60 minutes, then filter, wash, and dry the solution at 80°C for 6 hours. After drying, it can be calcined at 400°C for 6 hours under oxygen atmosphere. A positive electrode material coated with a nano-alumina film is obtained, and the thickness of the nano-film is 10 nm. Use this material as the positive electrode material to make a button battery. The lithium sheet is the negative electrode. The charge and discharge cut-off voltage is 2.75v-4.2...

Embodiment 2

[0025] 50g of LiNi with an average particle size of 10um 0.5 co 0.2 mn 0.3 o 2 Mix the positive electrode material with a deionized aqueous solution with a concentration of 1M sodium bicarbonate evenly, then slowly add a 0.15M aluminum sulfate solution into the mixed solution of the positive electrode material, keep the temperature at 52°C, and keep stirring, while adding an appropriate amount of Adjust the pH value of the solution with ammonia water to 9, stir for 30 minutes, then stand still for 60 minutes, then filter, wash, and dry the solution at 80°C for 6 hours, and then calcinate at 400°C for 6 hours under an oxygen atmosphere to obtain nano A positive electrode material coated with aluminum oxide film, the thickness of the nano film is 14nm. Use this material as the positive electrode material to make a button battery. The lithium sheet is the negative electrode. The charge and discharge cut-off voltage is 2.75v-4.25v. Under the condition of 2c discharge current, t...

Embodiment 3

[0027] 50g of LiNi with an average particle size of 10um 0.5 co 0.2 mn 0.3 o 2 Mix the positive electrode material with the deionized aqueous solution with a concentration of 1.5M sodium bicarbonate evenly, then slowly add the aluminum chloride solution with a concentration of 0.2M into the mixed solution of the positive electrode material, keep the temperature at 50°C, and keep stirring while adding Adjust the pH of the solution to 9.5 with an appropriate amount of ammonia water, stir for 30 minutes, then stand still for 60 minutes, then filter, wash, and dry the solution at 80°C for 6 hours, and then calcine at 500°C for 6 hours under an oxygen atmosphere. A positive electrode material coated with a nano-alumina film is obtained, and the thickness of the nano-film is 20 nm. Use this material as the positive electrode material to make a button battery. Lithium sheet is the negative electrode. Under current conditions, the capacity of 500 cycles is maintained at 144.2mAh / g...

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Abstract

The invention provides a lithium ion positive electrode material cladded by a nanometer alumina membrane and a preparation method thereof. The preparation method comprises the following steps: evenly mixing a positive electrode material with a deionized water solution of sodium bicarbonate; slowly adding an aluminum salt solution with a certain concentration into a mixed solution of the positive electrode material; continuously stirring at the temperature within 50 DEG C to 55 DEG C and regulating the pH value of the solution to reach 8-12 by adding a proper amount of ammonium hydroxide at the same time; stirring for 20-120 minutes; then standing for 60-100 minutes; filtering, washing and drying the solution; calcining for 2-10 hours at the temperature within 100 DEG C to 700 DEG C under the oxygen atmosphere after the drying of the solution, thereby obtaining the positive electrode material cladded by the nanometer alumina membrane, wherein the nanometer alumina membrane is within 10nm to 40nm in thickness. The method is simple in synthetic process, uniform in membrane cladding and easy in industrial production, and is used for optimizing the high-rate performance and high-temperature cycling performance of the material. Thus, the requirement of the market on the positive electrode material is satisfied well.

Description

technical field [0001] The invention belongs to the preparation method of battery positive electrode materials in the field of materials, and in particular relates to a lithium ion positive electrode material coated with a nano-alumina film and a preparation method thereof. technical background [0002] In recent years, due to the rapid development of the IT industry, the requirements for power supplies are increasing day by day, and the power supplies are required to be compact, lightweight, high capacity, high cycle performance, good high temperature performance, high energy density, etc., and lithium-ion batteries are characterized by their superior comprehensive performance is widely used. [0003] The performance of the cathode material in lithium-ion batteries has an important impact on the performance of lithium-ion batteries. The currently used ternary material LiNi x co y mn 1-x-y o 2 , 0.4≤x≤0.9, 0.1<y≤0.5 is a transition oxide with a layered structure. Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCH01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 马明远王明强程迪徐云军尹正中
Owner HENAN KELONG NEW ENERGY CO LTD
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