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A kind of gradient rubidium-doped nickel-cobalt-manganese cathode material and preparation method thereof

A positive electrode material, nickel-cobalt-manganese technology, applied in the field of new energy materials, can solve the problems of low ionic conductivity and unstable cycle performance, achieve performance improvement such as ionic conductivity and cycle stability, and solve the problems of low ionic conductivity Effect

Active Publication Date: 2020-07-31
光鼎铷业(广州)集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of low ionic conductivity and unstable cycle performance in the above-mentioned prior art, and provides a gradient rubidium-doped nickel-cobalt-manganese cathode material with high stability and high ionic conductivity and a preparation method thereof

Method used

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  • A kind of gradient rubidium-doped nickel-cobalt-manganese cathode material and preparation method thereof
  • A kind of gradient rubidium-doped nickel-cobalt-manganese cathode material and preparation method thereof
  • A kind of gradient rubidium-doped nickel-cobalt-manganese cathode material and preparation method thereof

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Embodiment 1

[0029] A graded rubidium-doped nickel-cobalt-manganese cathode material whose theoretical chemical expression is Li 1-a Rb a Ni 1-X-Y co X mn Y o 2 , where a=0.007, X=0.2, Y=0.3; the rubidium content gradually decreases from the center to the surface of the rubidium-doped nickel-cobalt-manganese positive electrode material particles, and the content of nickel, cobalt and manganese in the rubidium-doped nickel-cobalt-manganese Evenly distributed in the positive electrode material particles.

[0030] The preparation method of the above-mentioned gradient rubidium-doped nickel-cobalt-manganese positive electrode material comprises the following steps:

[0031] (1) Weigh 11.8795g of nickel chloride hexahydrate, 2.5966g of cobalt chloride, 3.7752g of manganese chloride, 0.08464g of rubidium chloride, and 2.4g of urea for mixing, and then use a peristaltic pump to pump in 20ml of volume concentration to be 100% After fully reacting for 1 hour, re-pump 20ml of ethanol solution ...

Embodiment 2

[0042] A graded rubidium-doped nickel-cobalt-manganese cathode material whose theoretical chemical expression is Li 1-a Rb a Ni 1-X-Y co X mn Y o 2 , wherein a=0.01, X=0.1, Y=0.1; the rubidium content gradually decreases from the center to the surface of the rubidium-doped nickel-cobalt-manganese positive electrode material particle, and the content of nickel, cobalt and manganese described in the rubidium-doped nickel-cobalt-manganese Evenly distributed in the positive electrode material particles.

[0043] The preparation method of the above-mentioned gradient rubidium-doped nickel-cobalt-manganese positive electrode material comprises the following steps:

[0044] (1) Weigh 21g of nickel sulfate hexahydrate, 2.81g of cobalt sulfate heptahydrate, 1.51g of manganese sulfate, 0.231g of rubidium carbonate, and 1.2g of urea to mix; then use a peristaltic pump to pump 40ml of ethanol solution with a volume concentration of 100% , after fully reacting for 1 hour, re-pump 40m...

Embodiment 3

[0052] A graded rubidium-doped nickel-cobalt-manganese cathode material whose theoretical chemical expression is Li 1-a Rb a Ni 1-X-Y co X mn Y o 2 , where a=0.02, X=1 / 3, Y=1 / 3; the rubidium content gradually decreases from the center to the surface of the rubidium-doped nickel-cobalt-manganese positive electrode material particle, and the content of nickel, cobalt and manganese described in the rubidium-doped The mixed nickel-cobalt-manganese cathode material particles are evenly distributed.

[0053] The preparation method of the above-mentioned gradient rubidium-doped nickel-cobalt-manganese positive electrode material comprises the following steps:

[0054] (1) Weigh 6.0901g of nickel nitrate, 9.7016g of cobalt nitrate hexahydrate, 5.965g of manganese nitrate, 0.24g of rubidium chloride, and 4.0536g of formamide to mix, and then use a peristaltic pump to pump 80ml of ethylene dinitrate with a volume concentration of 100%. Alcohol solution, after fully reacting for 1 ...

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Abstract

The invention relates to a gradient rubidium-doped nickel-cobalt-manganese positive electrode material and a preparation method thereof. The theoretical chemical expression of the gradient rubidium-doped nickel-cobalt-manganese positive electrode material is Li<1-a>RbNi<1-X-Y>Co<X>Mn<Y>O<2>, wherein 0.001<=a<=0.02, 0.1<=X<=1 / 3, and 0.1<=Y<=1 / 3. The content of rubidium is gradually reduced frominside to outside in the rubidium-doped nickel-cobalt-manganese positive electrode material. Nickel, cobalt and manganese are uniformly distributed in the rubidium-doped nickel-cobalt-manganese positive electrode material. The preparation method is characterized by comprising the following steps: a nickel source, a cobalt source, a manganese source, rubidium salt and a precipitant are mixed according to a certain ratio by utilizing the characteristic that the radiuses of lithium ions and rubidium ions are close; then solutions of alcohols with different volume concentrations are pumped by using a peristaltic pump, wherein the volume concentrations of the alcohols are 100%-20% in sequence; the deposition amount of the rubidium salt is changed in a gradient manner, so that a gradient rubidium-doped material is obtained. Lithium ions in the ternary material are replaced in a rubidium ion gradient doping manner, and a more stable layered structure is formed. The rubidium-doped nickel-cobalt-manganese positive electrode material prepared by the preparation method disclosed by the invention has relatively good cycling stability and relatively high ionic conductivity.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a gradient rubidium-doped nickel-cobalt-manganese cathode material and a preparation method thereof. Background technique [0002] Nickel-rich ternary materials, as lithium-ion battery cathode materials, have high reversible capacity and become one of the most promising lithium-ion battery cathode materials in the field of new energy vehicles. However, when the nickel content is too high, it is easy to interleave with lithium, which is not conducive to the electrochemical performance of the material. With the increase of nickel content in ternary materials, the capacity will also increase. However, at the same time, the safety problems caused by structural instability have also become the main problems that limit the market application of high-nickel ternary materials. [0003] At present, the main methods to improve the stability and ionic conductivity of high-ni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王仲明唐浩林陈智伟陈志华詹心泉
Owner 光鼎铷业(广州)集团有限公司