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Lithium ion battery cathode material and preparation method and application thereof

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in achieving ideal results, uneven doping elements, and high free lithium content, achieving wide applicability and improving safety. Performance, the effect of good application prospects

Active Publication Date: 2017-11-24
湖南金富力新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem solved by the present invention is: the existing positive electrode materials for high-nickel lithium-ion batteries need to improve their structural stability during use, because the uneven diffusion of lithium causes high free lithium content, and the conventional simple doping method leads to doping The heterogeneous elements are not uniform and it is difficult to achieve the desired effect; and the conventional sintering process in the production process requires high energy consumption, so it is urgent to develop a new simple and feasible process method

Method used

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  • Lithium ion battery cathode material and preparation method and application thereof
  • Lithium ion battery cathode material and preparation method and application thereof
  • Lithium ion battery cathode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Select a 1000L fusion machine, start stirring (500rpm), and add 381.3kg of nickel-cobalt-manganese precursor (Ni 0.81 co 0.10 mn 0.11 (OH) 2 , then weigh 156.6kg of lithium carbonate powder and add it to the fusion machine, add 222.3kg of deionized water and 1.1kg of polystyrene-glucose-based acrylic acid polymer at a solid content of 80wt% under stirring, and further reduce the speed after stirring for 2 hours (50rpm) Stir for 20min and discharge to form a paste material with a certain degree of molding for later use.

[0084] Adopt ventilated 24m roller kiln. Set the temperature in the heating zone to 200°C, and introduce oxygen-enriched air (the volume ratio of oxygen content is 45%, and the gas input volume is 400m 3 Under the condition of / h), put the above-mentioned pasty material into the ceramic bowl and carry out the first sintering. The sintering time is 15h, and the material is isolated from the air and cooled to normal temperature. The ratio of the poor...

Embodiment 2

[0090] Select 1000L plow mixer for use, start stirring (20rpm), and add 380.5kg of nickel-cobalt-aluminum precursor (Ni 0.82 co 0.17 Al 0.01 (OH) 2 , then weigh 285.6kg lithium acetate powder and join in the plow mixer, add 66.62kg C934 resin, 226.1kg deionized water, 1.26kg lanthanum nitrate hexahydrate (industrial grade, purity 98.5% content less than The lanthanum content of the finished product is about 1000ppm), 0.27kg of tungsten ethanol (industrial grade, 97.5% purity, the tungsten content of the finished product is about 300ppm), after stirring for 2 hours, further reduce the speed (3-5rpm) and stir for 6 hours to form a certain shape. The high-strength paste material is ready for use.

[0091] Adopt ventilated 24m roller kiln. Set the temperature in the heating zone to 500°C, and introduce oxygen-enriched air (the volume ratio of oxygen content is 65%, and the gas input volume is 400m 3 Under the condition of / h), the above-mentioned pasty material is put into a ...

Embodiment 3

[0094] Select 1000L kneader for use, start stirring (30rpm), add the nickel-cobalt-manganese precursor (Ni 0.90 co 0.03 mn 0.07 (OH) 2 , then weigh 114.4kg of lithium fluoride powder and add it to the kneader, add 2.48kg of C940 resin under stirring, further reduce the speed (10rpm) after stirring for 1h, and stir for 30min to form a paste material with a certain degree of molding for later use .

[0095] Adopt ventilated 24m roller kiln. Set the temperature in the heating zone to 750°C, under the condition of introducing oxygen-enriched air (the volume ratio of oxygen content is 70%, and the gas input volume is 600m 3 / h) Put the above-mentioned pasty material into a ceramic bowl for sintering. The sintering time is 8 hours. The material is isolated from the air and cooled to normal temperature. Then pulverize with a cyclone vortex pulverizer to obtain the nickel cobalt lithium manganese oxide positive electrode material, the particle size of the material (D v50 ) is 16...

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Abstract

The invention relates to the field of a lithium ion battery and specifically relates to a lithium ion battery cathode material and a preparation method and application thereof. The chemical formula of the cathode material is Li <x>NiCoMn<c>R<d>O<2>, wherein the R is a doping element, the x is greater than 0.95 and is smaller than 1.15, the a is greater than 0.5 and is smaller than 1,0, the b is greater than 0 and is smaller than 0.2, the c is greater than or equal to 0.0 and is smaller than or equal to 0.3, the sum of a, b and c is equal to 1, the d is greater than or equal to 0 and is smaller than 0.1, the mass fraction of a nickel element in the cathode material is greater than 30%. The preparation method comprises the following steps of mixing nickel cobalt manganese precursors, lithium source compound and macromolecule acid polymers according to a stoichiometric ratio and then carrying out sintering to obtain the lithium ion battery cathode material. According to the lithium ion battery cathode material, the preparation method and the application, a stable and uniform body phase doped layer is formed on the surface of high-nickel lithium ion battery cathode material and the security performance of the lithium ion battery is improved. The preparation method is economic and feasible, is wide in applicability and remarkable in effect and has relatively good application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, mainly to the field of lithium ion battery positive electrode materials, and in particular to the lithium ion battery positive electrode material and its preparation method and application. Background technique [0002] In recent years, with the rise of smart phones, smart cars, and new energy vehicles, the requirements for the power energy density and safety of mobile devices are getting higher and higher. At present, the common cathode materials for lithium-ion batteries mainly include lithium cobalt oxide and lithium manganese oxide. , lithium nickel cobalt manganese oxide and lithium iron phosphate. Among them, although lithium cobalt oxide has a high energy density, it is mainly used in lithium-ion batteries in the 3C field due to limited cobalt storage. Lithium manganese oxide and lithium iron phosphate materials have low energy densities, and are gradually being used by nicke...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨亿华钟毅张可昕
Owner 湖南金富力新能源股份有限公司