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Mesoporous nano tungsten oxide coated nca positive electrode material and its preparation method and lithium ion battery

A technology of nano-tungsten oxide and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor material performance, high nickel content, and increased costs, and achieve improved cycle performance, stable structure, and long life. Effect

Active Publication Date: 2021-09-17
湖南桑瑞新材料有限公司
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  • Claims
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Problems solved by technology

The most difficult problem to overcome in the synthesis of high-nickel materials is mainly sintering and material processing performance. Because the nickel content is high, the requirements for the atmosphere of the sintering furnace are very high. The ordinary sintering method cannot meet this requirement, and the blind The use of oxygen atmosphere will increase the cost, and secondly, the performance of the material itself is not good; in addition, because of the high nickel content, the pH of the material and the high residual lithium content on the material surface, the material is very easy to absorb water during processing, so the environmental humidity needs to be strictly controlled

Method used

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  • Mesoporous nano tungsten oxide coated nca positive electrode material and its preparation method and lithium ion battery

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Effect test

Embodiment 1

[0033] A method for preparing an NCA cathode material coated with nanometer mesoporous tungsten oxide is provided, comprising the steps of:

[0034] (1) Mix the nickel chloride solution, cobalt chloride solution and aluminum chloride solution according to the Ni:Co:Al molar ratio of 82:15:3, then add NaOH solution to the mixed solution for neutralization, and pass the coprecipitation method Produce ternary system hydroxide precursors to precipitate Ni 0.82 co 0.15 Al 0.03 (OH) 2 , and then filter the obtained precipitate, wash it, and dry it at 100° C. for 5 hours to obtain a dry product 1;

[0035] (2) In the atmosphere furnace, air is introduced, and the dried product obtained in step 1) is heat-treated at 350 ° C for 9 hours and then cooled naturally to obtain the oxide precursor Ni 0.82 co 0.15 Al 0.03 o 2 ;

[0036] (3) The oxide precursor Ni obtained in step 2) 0.82 co 0.15 Al 0.03 o 2 Mix with lithium hydroxide according to the molar ratio of metal cations a...

Embodiment 2

[0040] A method for preparing an NCA cathode material coated with nanometer mesoporous tungsten oxide is provided, comprising the steps of:

[0041] (1) Mix the nickel nitrate solution, cobalt nitrate solution and aluminum nitrate solution according to the Ni:Co:Al molar ratio of 85:10:5, then add NaOH solution to the solution to neutralize, and produce ternary by co-precipitation method Precipitated Ni from hydroxide precursors 0.85 co 0.1 Al 0.05 (OH) 2 . Then the obtained precipitate was filtered, washed, and dried at 120° C. for 6 hours to obtain dried product 1;

[0042] (2) In the atmosphere furnace, feed oxygen or air, heat-treat the dried product obtained in step 1) at 450°C for 10 hours, and then cool it naturally to obtain the oxide precursor Ni 0.85 co 0.1 Al 0.05 o 2 ;

[0043] (3) The oxide precursor Ni obtained in step 2) 0.85 co 0.1 Al 0.05 o 2 Mix with lithium carbonate according to the molar ratio of metal cations and Li ions in the oxide precurso...

Embodiment 3

[0047] A method for preparing an NCA cathode material coated with nanometer mesoporous tungsten oxide is provided, comprising the steps of:

[0048] (1) Mix the nickel sulfate solution, cobalt sulfate solution and aluminum sulfate solution according to the Ni:Co:Al molar ratio of 87:10:3, then add NaOH solution to the solution to neutralize, and produce ternary by coprecipitation method Precipitated Ni from hydroxide precursors 0.87 co 0.1 Al 0.03 (OH) 2 . Then the obtained precipitate was filtered, washed, and dried at 150° C. for 7 hours to obtain dried product 1;

[0049] (2) In the atmosphere furnace, air is introduced, and the dried product obtained in step 1) is heat-treated at 900°C for 8 hours and then cooled naturally to obtain the oxide precursor Ni 0.87 co 0.1 Al 0.03 o 2 ;

[0050] (3) The oxide precursor Ni obtained in step 2) 0.87 co 0.1 Al 0.03 o 2 Mix with lithium acetate according to the molar ratio of metal cations and Li ions in the oxide precur...

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Abstract

A mesoporous nanometer tungsten oxide-coated NCA cathode material, a preparation method thereof and a lithium ion battery. The preparation method includes: 1) preparation of hydroxide precursor by co-precipitation method; 2) heat treatment to obtain oxide precursor; 3) two-stage sintering of oxide precursor and lithium salt to obtain Li x Ni 1‑y‑z co y Al z o 2 Cathode material, wherein: 1≤x≤1.15, 0.05≤y≤0.15, 0≤z≤0.05; 4) cleaning and drying; 5) mixing the dried material with mesoporous silica template and tungsten oxide, and then high temperature Sintering crystallizes tungsten oxide in the pores and removes the template with HF acid to obtain a high-capacity NCA material coated with nano-mesoporous tungsten oxide with large surface energy and double pore diameter. The present invention also provides the NCA cathode material coated with mesoporous nano-tungsten oxide prepared by the above preparation method and a lithium ion battery using the cathode material. The preparation method of the invention has low requirements on synthesis equipment, simple operation, no special requirements on sintering process, and can prepare NCA positive electrode material suitable for industrial scale production, high capacity and long life.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a mesoporous nanometer tungsten oxide-coated NCA cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, stable working voltage, and small self-discharge, and are considered to be one of the batteries with development potential. In recent years, with the continuous strengthening of portable electronic products (such as notebook computers, mobile phones, camcorders, digital cameras, cordless power tools, etc.), the demand for lithium-ion battery market has maintained a very high growth rate; with the application of lithium-ion batteries With the continuous expansion of the field, the market demand for it is increasing, but its price is too high. Therefore, reducing production costs and improving battery capacity and other pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 常敬杭王浩商士波唐泽勋梅晶吴海燕叶超高圳
Owner 湖南桑瑞新材料有限公司
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