Nickel-cobalt composite oxide, nickel-cobalt doped oxide and preparation method thereof

A composite oxide and oxide technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of reducing material capacity activity, difficult internal oxidation, and low degree of oxidation, and achieve complete crystallization, good sphericity, and good activity. Effect

Active Publication Date: 2011-06-22
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with the publication number CN1770511 discloses a method for preparing a nickel-cobalt-containing multi-element metal oxide and a method for surface coating modification thereof, in which nickel-cobalt and another transition metal composition are mixed into a solution, and the solution is mixed with hydroxide Sodium forms hydroxide in an inert atmosphere, then mixes lithium hydroxide with it, and finally calcines at high temperature to form lithium nickel cobalt oxide. The precursor of this method is prepared in an inert atmosphere; the patent publication number is CN200710054759.8 The literature discloses a spherical nickel-cobalt-manganese oxyhydroxide and its preparation method. The spherical nickel-cobalt-manganese hydroxide matrix is ​​first synthesized, and then chemically oxidized in an aqueous phase system. This method is easy to oxidize the spherical surface, but difficult to oxidize the interior. The degree of oxidation is not high; the patent with the publication number CN1765749 discloses mixed metal hydroxides and their preparation and use, which is to continuously react nickel cobalt hydroxide and sodium aluminate in the pipeline, so that aluminum is deposited on hydrogen as aluminum hydroxide Oxides nickel-cobalt surfaces, forming mixed metal hydroxides, but the coated aluminum in this method significantly reduces the capacitive activity of the material

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  • Nickel-cobalt composite oxide, nickel-cobalt doped oxide and preparation method thereof
  • Nickel-cobalt composite oxide, nickel-cobalt doped oxide and preparation method thereof

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Embodiment 1

[0033] A mixed solution of cobalt sulfate and nickel sulfate is used, wherein the total concentration of nickel and cobalt is 2.0mol / L, the molar ratio of nickel to cobalt is 2.55:0.45, the concentration of sodium hydroxide solution is 5mol / L, and the concentration of ammonia water is 1mol / L. It is a saturated sodium chlorate solution; nickel-cobalt metal solution, lye, and additives are added to the reaction device in parallel, and by adjusting the flow of lye and additives, the control potential reaction potential is 1200mV and the pH value is 11.5, and the nickel-cobalt precipitates simultaneously by Bivalent oxidation to trivalent; keep the potential and pH value after the reaction overflows, and age for 3 hours; after filtering, wash with hot water at 60-70 degrees until the pH of the effluent is 6-8, and the impurities in the washed precipitate The content meets the requirement that the mass content of manganese, calcium, magnesium, manganese, and sodium is less than 150p...

Embodiment 2

[0036]Use a mixed solution of cobalt chloride and nickel chloride, wherein the total concentration of nickel and cobalt is 1.5mol / L, the molar ratio of nickel to cobalt is 2.12:0.88, the concentration of sodium hydroxide solution is 8mol / L, and the additive is perchloric acid solution Add nickel-cobalt metal solution, lye, and additives into the reaction device in parallel, by adjusting the flow of lye and additives, the potential reaction potential is controlled to be 1500mV and the pH value is 10.8, and the nickel-cobalt is oxidized from divalent to trivalent while precipitation ; Keep the potential and pH value after the reaction overflows, and age for 3.5 hours; after filtering, wash with hot water at 60-70 degrees until the pH value of the effluent is 6-8, and the impurity content in the washed precipitate meets the requirements of manganese and calcium , magnesium, manganese, sodium mass content is less than 150ppm, zinc, copper, iron, lead, mercury, hexavalent chromium m...

Embodiment 3

[0039] Use cobalt chloride, nickel sulfate, aluminum sulfate to prepare mixed solution, wherein the total concentration of nickel, cobalt and aluminum is 1.5mol / L, the molar ratio of nickel, cobalt and aluminum is 2.40: 0.45: 0.15, and the concentration of sodium hydroxide solution is 6mol / L, the concentration of ammonia water is 1.5mol / L, and the additive is a mixed solution of potassium chlorate and hydrogen peroxide; the mixed solution of nickel-cobalt-aluminum metal, lye, and additives are added to the reaction device in parallel, and the potential is controlled by adjusting the flow of lye and additives. The reaction potential is 900mV and the pH value is 11.2; keep the potential and pH value after the reaction overflows, and age for 2 hours; after filtering, wash with hot water at 60-70 degrees until the pH value of the effluent is 6-8, and the impurity content in the precipitate Meet the requirements that the mass content of manganese, calcium, magnesium, manganese, and ...

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Abstract

The invention discloses a nickel-cobalt composite oxide and a nickel-cobalt doped oxide. The molecular formula of the nickel-cobalt composite oxide can be represented by a general formula NixCo(3-x)O4+/-z, wherein x is more than or equal to 1.8 and less than or equal to 2.7, and z is more than or equal to 0 and less than or equal to 0.5; and the molecular formula of the nickel-cobalt doped oxide can be represented by a general formula NixCo(3-x-y)MyO4+/-z, wherein the x is more than or equal to 1.8 and less than or equal to 2.7, y is more than or equal to 0.03 and less than 0.3, and z is morethan or equal to 0 and less than or equal to 0.5. The invention also discloses a method for preparing the nickel-cobalt composite oxide and the nickel-cobalt doped oxide. The nickel-cobalt composite oxide and the nickel-cobalt doped oxide have the advantages of excellent sphericility degree, high density, complete crystal and good activity.

Description

technical field [0001] The invention belongs to the field of preparation of functional powder materials, and more specifically relates to a preparation method of a matrix material of a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion battery lithium nickel cobalt oxide cathode material has a capacity 20% higher than that of lithium cobalt oxide and lithium nickel cobalt manganese oxide in addition to having a working voltage platform similar to lithium cobalt oxide and lithium nickel cobalt manganese oxide. It has become an important research and application direction for power batteries and high energy density battery materials. At present, the precursors used for lithium nickel cobaltate are spherical nickel-cobalt hydroxide or nickel-cobalt oxide. However, due to the disadvantages of high alkalinity, strong water absorption, high activity during charge and discharge, poor structural stability, and many side reactions with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 唐红辉李长东周汉章刘更好汤婕谭群英
Owner GUANGDONG BRUNP RECYCLING TECH
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