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Cerium-cobalt-coated nickel hydroxide composite material and preparation method and application thereof

A technology of nickel hydroxide and composite materials, which is applied in the direction of nickel storage batteries, electrical components, battery electrodes, etc., can solve the problems of conductivity, stability and high temperature resistance, immature preparation technology, etc., to improve conductivity and Reduction resistance, less raw material consumption, and the effect of improving high temperature resistance

Active Publication Date: 2014-11-12
CHANGSHA RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process in this document is mainly to directly add and blend cobalt-cerium compounds into the positive electrode active material of the alkaline storage battery, and it mainly emphasizes the improvement and optimization of the atomic percentage of cerium ions and cobalt ions, and its preparation process does not Immature, and the conductivity, stability and high temperature resistance of the product need to be improved

Method used

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  • Cerium-cobalt-coated nickel hydroxide composite material and preparation method and application thereof
  • Cerium-cobalt-coated nickel hydroxide composite material and preparation method and application thereof
  • Cerium-cobalt-coated nickel hydroxide composite material and preparation method and application thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned cerium-cobalt-coated nickel hydroxide composite material comprises the following steps:

[0026] First select the trivalent cerium salt with a relatively high pH value for precipitation to dissolve, then dissolve the cobalt salt to obtain a mixed salt solution containing trivalent cerium salt and cobalt salt, and the mol ratio of trivalent cerium salt and cobalt salt in the mixed solution is controlled as 0.2~0.6:1;

[0027] Then select the complexing agent equivalent to trivalent cerium salt and cobalt salt complexation stability constant, complexing agent is ethylenediaminetetraacetic acid (EDTA), and the ratio of the total moles of cerium and cobalt in complexing agent and mixed solution is 0.04~0.30:1;

[0028] Mix the mixed salt solution and complexing agent first to obtain a mixed solution, then add the mixed solution and precipitant to the solution containing spherical nickel hydroxide to carry out uniform co-precipi...

Embodiment 1

[0033] a kind of like figure 1 The cerium-cobalt-coated nickel hydroxide composite material of the present invention is shown, the composite material is a core-shell structure comprising an inner core and an outer cladding, the inner core is spherical nickel hydroxide, the outer cladding is mainly an oxide containing cerium and cobalt, and the hydroxide The molar ratio of nickel to cerium is 1:0.024, and the molar ratio of nickel hydroxide to cobalt is 1:0.096; the average particle size distribution is 10-13 microns, and the powder impedance is 2.3Ω.

[0034] The preparation method of the above-mentioned cerium-cobalt-coated nickel hydroxide composite material in this embodiment comprises the following steps:

[0035] First select cerium nitrate with a relatively high pH value for precipitation to dissolve, then dissolve cobalt sulfate to obtain a mixed salt solution containing cerium nitrate and cobalt sulfate, and control the molar ratio of cerium nitrate and cobalt sulfate ...

Embodiment 2

[0041] a kind of like figure 2 The cerium-cobalt-coated nickel hydroxide composite material of the present invention is shown, the composite material is a core-shell structure comprising an inner core and an outer cladding, the inner core is spherical nickel hydroxide, the outer cladding is mainly an oxide containing cerium and cobalt, and the hydroxide The molar ratio of nickel to cerium is 1:0.04, the molar ratio of nickel hydroxide to cobalt is 1:0.08, the average particle size distribution is 10-13 microns, and the powder impedance is 2.5Ω.

[0042] The preparation method of the above-mentioned cerium-cobalt-coated nickel hydroxide composite material in this embodiment comprises the following steps:

[0043] First select cerium nitrate with a relatively high pH value for precipitation to dissolve, then dissolve cobalt sulfate to obtain a mixed salt solution containing cerium nitrate and cobalt sulfate, and control the molar ratio of cerium nitrate and cobalt sulfate in th...

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Abstract

The invention discloses a cerium-cobalt-coated nickel hydroxide composite material which is of a core shell type structure. A core is spherical nickel hydroxide, an outer coating layer is mainly hydroxide containing cerium and cobalt, the molar ratio of nickel hydroxide to cerium is 1:0.007 to 0.056, and the molar ratio of nickel hydroxide to cobalt is 1:0.025 to 0.125. A preparation method of the cerium-cobalt-coated nickel hydroxide composite material includes the steps that cerous salt and cobalt salt are dissolved, a complexing agent and a salt mixture solution are mixed and then complexed, the obtained mixed solution and precipitant are added to a solution containing spherical nickel hydroxide, cerium-cobalt even co-precipitation reaction is conducted, the coating layer is formed on the surface, washing, drying and oxidizing are conducted, and then the cerium-cobalt-coated nickel hydroxide composite material is obtained. The cerium-cobalt-coated nickel hydroxide composite material can serve and be used as a positive electrode energy storage material for improving the high-temperature performance of a nickel-metal hydride battery, and conductivity, reducibility resistance and high-temperature resistance of spherical nickel hydroxide can be remarkably improved.

Description

technical field [0001] The invention relates to a positive electrode material containing nickel hydroxide and its preparation method and application, in particular to an application of a coated nickel hydroxide composite material and its preparation method in secondary batteries. Background technique [0002] With the development of science and technology and the promotion and popularization of mobile technology equipment, mobile equipment has been widely used in various fields such as life research. Existing mobile devices are generally equipped with secondary batteries to power the mobile devices, and ordinary secondary batteries are suitable for use at room temperature, but in high temperature environments, their charge and discharge performance is poor, and it is difficult to meet the requirements of mobile devices. In a high temperature environment, the batteries that power mobile devices need to have special performance, that is, the high temperature resistance of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/36
CPCH01M4/366H01M4/38H01M4/523H01M10/30Y02E60/10
Inventor 张海艳周勤俭甘胜徐浩胡志兵孙卓覃事彪张臻彭红丰
Owner CHANGSHA RES INST OF MINING & METALLURGY
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