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Composite partile, nickel-hydrogen secondary cell negative-pole and cell and method for making same

A composite particle, negative electrode conductive technology, applied in battery electrodes, alkaline storage battery electrodes, alkaline storage batteries, etc., can solve problems such as poor internal pressure performance of nickel-metal hydride secondary batteries, and achieve the effect of improving internal pressure performance

Inactive Publication Date: 2007-06-13
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the poor internal pressure performance of the nickel-hydrogen secondary battery made in the prior art, provide a composite particle and a preparation method thereof, and add the composite particle to the negative electrode material of the nickel-hydrogen secondary battery Can improve the internal pressure performance of nickel metal hydride secondary batteries

Method used

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  • Composite partile, nickel-hydrogen secondary cell negative-pole and cell and method for making same
  • Composite partile, nickel-hydrogen secondary cell negative-pole and cell and method for making same

Examples

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preparation example Construction

[0021] The preparation method of the composite particle provided by the invention comprises oxidizing the surface of the cobalt monoxide particle into tricobalt tetroxide in an oxidative atmosphere of 80°C-150°C.

[0022] Wherein, the oxidizing atmosphere can be various conditions that can oxidize cobalt monoxide into tricobalt tetroxide. For example, preferably, the cobalt monoxide particles are heated to 80°C-150°C in the presence of oxygen, and the surface of the particles Cobalt monoxide is oxidized to tricobalt tetroxide to obtain composite particles having tricobalt tetroxide formed on the surface. By controlling the reaction time, the amount of tricobalt tetroxide on the surface of the composite particles can be controlled. For example, the reaction time is 0.2-6 hours, preferably 0.5-5 hours. Therefore, in the obtained composite particles, based on the total weight of the composite particles, the content of tricobalt tetroxide is 2-60% by weight, preferably 5-50% by we...

Embodiment 1

[0040] This example is used to illustrate the composite particle provided by the present invention and its preparation method.

[0041] Cobalt monoxide particles with an average particle size of 3 microns were placed in an oven at 120°C and heated for 2 hours, and the oven was connected to the atmosphere. According to X-ray diffraction analysis, the surface of composite particles has formed Co 3 o 4 .

[0042] Measure the weight m of cobalt monoxide particles respectively 1 and the weight of the composite particle m 2 , calculate Co according to 3 o 4 The content in the composite particles is 10% by weight.

[0043]

Embodiment 2

[0045] This example is used to illustrate the composite particle provided by the present invention and its preparation method.

[0046] Cobalt monoxide particles with an average particle size of 0.2 microns were placed in an oven at 90° C. for 4 hours and heated for 4 hours, and the oven was connected to the atmosphere. According to X-ray diffraction analysis, the surface of composite particles has formed Co 3 o 4 . Determination of Co according to the same method as in Example 1 3 o 4 The content in the composite particles is 45% by weight.

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Abstract

The disclosed compound particle contains cobalt monoxide, and cobaltosic oxide, which is distributed on surface of particle. The invention also discloses cathode and nickel-hydrogen secondary battery containing the disclosed compound particles. Performance of internal voltage of the nickel-hydrogen secondary battery is improved remarkably since the compound particles are added to material of cathode.

Description

technical field [0001] The invention relates to a composite particle, a negative electrode of a nickel-hydrogen secondary battery and a battery containing the composite particle, and a preparation method thereof. Background technique [0002] Alkaline secondary batteries mainly include nickel-hydrogen secondary batteries, nickel-cadmium secondary batteries and nickel-zinc secondary batteries. Compared with nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries have the advantages of high energy and no cadmium pollution. [0003] A nickel-metal hydride secondary battery generally includes an electrode group and an alkaline electrolyte sealed in a battery case. The electrode group includes a positive electrode, a negative electrode and a separator. The positive pole comprises a positive electrode conductive substrate and a positive electrode material coated and / or filled on the positive electrode conductive substrate, and the positive electrode material cont...

Claims

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Application Information

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IPC IPC(8): H01M4/52B22F1/02H01M4/24H01M4/26H01M10/24
CPCY02E60/124Y02E60/10
Inventor 耿伟贤
Owner BYD CO LTD
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