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NCM ternary cathode material doped with Mo element in surface layer and bulk phase, and preparation method thereof

A cathode material and surface layer technology, applied in the field of NCM ternary cathode material and its preparation, can solve the problems of unfavorable doping content, high content, large energy consumption, etc., and achieve the effects of easy process and technology, and simple operation.

Inactive Publication Date: 2018-11-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing Mo modification of the positive electrode material of lithium-ion batteries is mostly carried out by the sol-gel method or directly adding Mo salt in the co-precipitation process. This method is not conducive to the control of doping content and requires a large content of Mo; Or by wet chemical method, that is, by mixing the positive electrode material with alcohol, heating and stirring until it is evaporated to dryness, and then calcining to complete the Mo modification. This method is more complicated and requires secondary calcination, which consumes a lot of energy.

Method used

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  • NCM ternary cathode material doped with Mo element in surface layer and bulk phase, and preparation method thereof
  • NCM ternary cathode material doped with Mo element in surface layer and bulk phase, and preparation method thereof
  • NCM ternary cathode material doped with Mo element in surface layer and bulk phase, and preparation method thereof

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Effect test

Embodiment 1

[0057] A kind of Mo doping amount is the preparation method of 0.5wt% NCM ternary cathode material, and described method step is as follows:

[0058] Step (1) Weigh NiSO according to the molar ratio of Ni:Co:Mn=8:1:1 4 ·6H 2 O solid 42.056g, CoSO 4 ·7H 2 O solid 5.62 g, MnSO 4 ·H 2 O solid 3.3804 g. Add the weighed sulfate into 100mL deionized water, stir evenly and configure the metal salt concentration to be 2mol L -1 mixed salt solution. Weigh 14.4g of sodium hydroxide, 24.5mL of ammonia solution with a mass fraction of 25%, add deionized water to prepare 1.8mol L -1 mixed alkaline solution.

[0059] Step (2) Fix the reaction kettle, and add 50 mL of deionized water as the coprecipitation reaction bottom liquid. The water bath is filled with water, the temperature of the water bath is controlled at about 55°C, the stirring speed is controlled at 600r / min, and the stirring and heating in the water bath run through the entire reaction process. Nitrogen was passed th...

Embodiment 2

[0071] A kind of Mo doping amount is the preparation method of the NCM ternary cathode material of 1wt%, described method step is as follows:

[0072] Step (1) Weigh NiSO according to the molar ratio of Ni:Co:Mn=8:1:1 4 ·6H 2 O solid 42.056g, CoSO 4 ·7H 2 O solid 5.62 g, MnSO 4 ·H 2 O solid 3.3804 g. Add the weighed sulfate into 100mL deionized water, stir evenly and configure the metal salt concentration to be 2mol L -1 mixed salt solution. Weigh 14.4g of sodium hydroxide, 24.5mL of ammonia solution with a mass fraction of 25%, add deionized water to prepare 1.8mol L -1 mixed alkaline solution.

[0073]Step (2) Fix the reaction kettle, and add 50 mL of deionized water as the coprecipitation reaction bottom liquid. The water bath is filled with water, the temperature of the water bath is controlled at about 55°C, the stirring speed is controlled at 600r / min, and the stirring and heating in the water bath run through the entire reaction process. Nitrogen was passed th...

Embodiment 3

[0085] A kind of Mo doping amount is the preparation method of the NCM ternary cathode material of 2wt%, described method step is as follows:

[0086] Step (1) Weigh NiSO according to the molar ratio of Ni:Co:Mn=8:1:1 4 ·6H 2 O solid 42.056g, CoSO 4 ·7H 2 O solid 5.62 g, MnSO 4 ·H 2 O solid 3.3804 g. Add the weighed sulfate into 100mL deionized water, stir evenly and configure the metal salt concentration to be 2mol L -1 mixed salt solution. Weigh 14.4g of sodium hydroxide, 24.5mL of ammonia solution with a mass fraction of 25%, add deionized water to prepare 1.8mol L -1 mixed alkaline solution.

[0087] Step (2) Fix the reaction kettle, and add 50 mL of deionized water as the coprecipitation reaction bottom liquid. The water bath is filled with water, the temperature of the water bath is controlled at about 55°C, the stirring speed is controlled at 600r / min, and the stirring and heating in the water bath run through the entire reaction process. Nitrogen was passed t...

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Abstract

The invention relates to an NCM ternary cathode material doped with a Mo element in a surface layer and a bulk phase, and a preparation method thereof, belonging to the field of chemical energy storage batteries. In total mass of 100% material, Mo element doped in the surface layer and the bulk phase accounts for 0.5-2%, and the other is NCM ternary cathode material. The method comprises the stepsof adding alcohol to a mixture of nickel-cobalt-manganese hydroxide precursor, ammonium molybdate and LiOH.H2O and grinding and mixing uniformly, so as to obtain dry grinded material; calcining the dry grinded material, precalcining the material for 300-400 minutes at 500-550DEG C, then calcining for 800-900 minutes at 700-750DEG C so as to obtain the material. The doped Mo element can stabilizethe material structure, lower charge transfer impedance, and improve electrochemical performance of the material. The method is easy to perform and the process technology are easy to realize.

Description

technical field [0001] The invention relates to an NCM ternary positive electrode material whose surface layer and bulk phase are doped with Mo elements and a preparation method thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] With the gradual reduction of fossil energy reserves and a series of environmental pollution problems caused by traditional fuel vehicles are becoming more and more serious, people's demand for building a low-carbon and environmentally friendly society is becoming stronger and stronger. The development of new energy vehicles has become very important. In recent years, my country's new energy vehicle industry dominated by electric vehicles has developed vigorously. The development of electric vehicles will inevitably lead to progress in the field of power batteries. Lithium-ion batteries have attracted widespread attention due to their good cycle performance, high energy density and environmental friend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 苏岳锋杨永清陈来陈刚李聪卢赟包丽颖陈实王敬吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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