Two-dimensional nanocrystalline metal oxide composite coating lithium manganate positive electrode material and preparation method thereof

A coating lithium manganate, two-dimensional nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of not being able to meet high ionic conductivity and electronic conductivity at the same time, Achieve uniform thickness, obvious effect and uniform dispersion effect

Active Publication Date: 2014-05-21
安徽益佳通电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the spinel-type lithium manganese oxide coating materials that have been studied mainly include single oxides, metals, polymers, etc., such as ZnO, SiO 2 、TiO 2 , MgO, La 2 o 3 、

Method used

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  • Two-dimensional nanocrystalline metal oxide composite coating lithium manganate positive electrode material and preparation method thereof
  • Two-dimensional nanocrystalline metal oxide composite coating lithium manganate positive electrode material and preparation method thereof
  • Two-dimensional nanocrystalline metal oxide composite coating lithium manganate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Weigh 0.3g of lanthanum nitrate hexahydrate and place it in a 250mL three-necked flask, add an appropriate amount of deionized water to dissolve, and obtain a lanthanum salt solution;

[0038] 2) Weighing 30g of spinel-type lithium manganate positive electrode material, adding it to the lanthanum salt solution, and performing ultrasonic treatment for 3 hours under the condition of 100W / 40KHz to obtain mixed solution A;

[0039] 3) Under ultrasonic conditions of 100W / 40KHz, add ammonia water to the mixed solution A until the pH of the mixed solution A is 9;

[0040] 4) Put the solution obtained in step 3) in a 500mL reaction kettle, and react at 180°C for 12h; take it out, cool at room temperature, filter, wash with deionized water, and dry to obtain a spinel-type lithium manganate material coated with lanthanum salt Precursor;

[0041] 5) placing the precursor of the lanthanum salt-coated spinel-type lithium manganate material at 500° C., and heat-treating it for 5 ...

Embodiment 2

[0052] 1) Weigh 1.5g of lanthanum nitrate hexahydrate and place it in a 250mL three-necked flask, add an appropriate amount of deionized water to dissolve, and obtain a lanthanum salt solution;

[0053] 2) Weigh 30g of spinel-type lithium manganate cathode material, add it into a three-necked flask, and perform ultrasonic treatment at 75°C, 500W / 60KHz for 1 hour to obtain a mixed solution A;

[0054] 3) Under ultrasonic conditions of 500W / 60KHz, add urea aqueous solution to the mixed solution A until the pH of the mixed solution A is 8;

[0055] 4) Put the solution obtained in step 3) in a 500mL reaction kettle, and react at 180°C for 6h; take it out, cool at room temperature, filter, wash with deionized water, and dry to obtain a spinel-type lithium manganate material coated with lanthanum salt the precursor of

[0056] 5) placing the obtained precursor of the lanthanum salt-coated spinel-type lithium manganate material at 400° C., and heat-treating it for 6 hours to obtain ...

Embodiment 3

[0064] 1) Weigh 0.60g of lanthanum chloride and place it in a 250mL three-necked flask, add an appropriate amount of deionized water to dissolve, and obtain a lanthanum salt solution;

[0065] 2) Weigh 30g of spinel-type lithium manganate cathode material, add it into a three-necked flask, and perform ultrasonic treatment at 75°C and 300W / 50KHz for 2 hours to obtain a mixed solution A;

[0066] 3) Under the ultrasonic condition of 300W / 50KHz, add the mixed solution A of ammonia water and urea to the mixed solution until the pH of the mixed solution A is 9;

[0067] 4) Put the solution obtained in 3) in a 500mL reaction kettle, and react at 180°C for 12h; take it out, cool at room temperature, filter, wash with deionized water, and dry to obtain the lanthanum salt-coated spinel lithium manganate material. Precursor;

[0068]5) placing the obtained precursor of the lanthanum salt-coated spinel-type lithium manganate material at 600° C., and heat-treating it for 4 hours to obtai...

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Abstract

The invention discloses a preparation method for a lithium manganate positive electrode material of a two-dimensional nanocrystalline metal oxide composite coating. The preparation method comprises the specific steps: weighing lanthanum salt and spinel lithium manganate according to ratios; dissolving the lanthanum salt into water and adding the lithium manganate; adding a precipitant and reacting at 150-180 DEG C for 6-24 hours; filtering and drying; sintering a obtained precursor to obtain a lanthanum salt coating lithium manganate material; weighing aluminum salt and adding water to dissolve; then adding the lanthanum salt coating lithium manganate material; adding the precipitant; and filtering, drying and sintering to obtain the lithium manganate positive electrode material. According to the preparation method, a hydrothermal-precipitation method is used for covering the lithium salt and the aluminum salt on the surfaces of lithium manganate grains; after the lithium manganate grains are sintered, the lithium manganate positive electrode material with the lithium manganate grains coated with one layer of a La2O3-Al2O3, Al2O3-LLTO, LLTO-La2O3 or La2O3-Al2O3-LLTO two-dimensional coating material is obtained; the obtained positive electrode material has good first-time discharging efficiency and circulating performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a two-dimensional nanometer metal oxide composite coating lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries play an increasingly important role in various fields such as energy, environment, and information technology. As a rechargeable battery, lithium-ion batteries have the advantages of high voltage, high specific energy, good cycle performance, and wide operating temperature range, which meet people's needs for light, less pollution, and long-life energy. At present, the commercial lithium-ion battery cathode materials mainly include: lithium cobaltate, lithium iron phosphate, nickel-cobalt-manganese ternary materials and lithium manganese oxide. The layered lithium cobaltate material has high theoretical specific capacity and stable electrochemical performanc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/483H01M4/505H01M10/0525Y02E60/10
Inventor 李庆余赖飞燕张晓辉王红强黄有国李玉崔李三吴永生
Owner 安徽益佳通电池有限公司
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