Method for evenly cladding CoOOH on powdery nickel hydroxide electrode material surface

A technology of nickel hydroxide and electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of insufficient bonding between the coating layer and the product, the degradation of the electrochemical cycle performance of the material, and the coating layer is easy to fall off. Achieve the effects of good charge and discharge reversibility, improved conductivity, and environmentally friendly coating

Inactive Publication Date: 2010-09-29
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used electroless plating method is harsh on the conditions and is easy to cause pollution. Although the solution deposition method is relatively simple, the combination of the coating layer and the product is not tight enough, causing the coating layer to fall off easily and cause pollution. Further lead to premature degradation of the electrochemical cycle performance of the material

Method used

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  • Method for evenly cladding CoOOH on powdery nickel hydroxide electrode material surface
  • Method for evenly cladding CoOOH on powdery nickel hydroxide electrode material surface
  • Method for evenly cladding CoOOH on powdery nickel hydroxide electrode material surface

Examples

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Effect test

Embodiment 1

[0017] Example 1: First, dissolve 0.65g of cobalt nitrate in 50mL of distilled water in the reactor, add 1g of powdered nickel hydroxide, place the reactor in a water bath at 90°C, and add 8mL of 30% H 2 o 2 The aqueous solution was added to the reactor at intervals, and kept stirring for 2 hours. After natural cooling, filter, wash with pure water and ethanol, and then dry at 80° C. for 6 hours to obtain the powdered nickel hydroxide material uniformly coated with CoOOH. The average mass percentage of cobalt in the CoOOH-coated powdered nickel hydroxide material measured by plasma emission spectrometry (ICP) is 3.6%, and the molar ratio of nickel to cobalt is 15.33:1. The mass percent content of cobalt in the powdery nickel hydroxide raw material before coating CoOOH is 1.38%, and the molar ratio of nickel to cobalt is 38.44:1. What needs to be explained here is that the commercialized nickel hydroxide material is a composite material containing a certain proportion of Co i...

Embodiment 2

[0018] Example 2: First, dissolve 0.98g of cobalt nitrate in 50mL of distilled water in the reactor, add 1g of powdery nickel hydroxide, place the reactor in a water bath at 90°C, and add 12mL of 30% H 2 o 2 The aqueous solution was added to the reactor at intervals, and kept stirring for 2 hours. After natural cooling, filter, wash with pure water and ethanol, and dry at 80° C. for 6 hours to obtain the powdered nickel hydroxide material uniformly coated with CoOOH. The obtained material was made into a bonded electrode for charge and discharge tests, and the results showed that the 2C discharge specific capacity of the prepared CoOOH-coated powdered nickel hydroxide was 336mAh / g.

Embodiment 3

[0019] Example 3: First, dissolve 0.33g of cobalt nitrate in 50mL of distilled water in the reactor, add 1g of powdery nickel hydroxide, place the reactor in a water bath at 90°C, and add 12mL of 10% H 2 o 2 The aqueous solution was added to the reactor at intervals, and kept stirring for 2 hours. After natural cooling, filter, wash with pure water and ethanol, and then dry at 80° C. for 6 hours to obtain the powdered nickel hydroxide material uniformly coated with CoOOH. The obtained materials were made into bonded electrodes for charge and discharge tests. The results showed that the 2C discharge specific capacity of the prepared CoOOH-coated powdered nickel hydroxide was 341mAh / g, and the capacity after 200 cycles of charge and discharge at the 2C rate was No attenuation occurred.

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Abstract

The invention relates to a method for uniformly, closely and tightly coating a layer of CoOOH which plays a role in improving electrical conductivity on the surface of a powdered nickel hydroxide particle which is taken as a positive electrode active material for an alkaline storage battery. The method is that: in neutral aqueous solution, hydrogen peroxide is taken as an oxidizing agent, a thin layer of uniform and stable CoOOH is formed on the surface of the nickel hydroxide particle by virtue of the ion exchange between bivalent soluble cobalt salt and the surface of the solid nickel hydroxide particle, thus obtaining a powdered nickel hydroxide electrode material coated with cobalt. The method of the invention has the advantages of simple operation, high efficiency, low cost and environment protection; and the prepared powdered nickel hydroxide electrode material coated with cobalt has good electrical conductivity, strong heavy-current charge-discharge capacity and good cycle performance.

Description

technical field [0001] The invention relates to a method for uniformly coating CoOOH on the surface of powdered nickel hydroxide particles used as positive electrode active materials for alkaline storage batteries, and further refers to forming a uniform and compact layer on the surface of powdered nickel hydroxide particles according to the principle of ion exchange reaction. method for a strong CoOOH coating. Background technique [0002] Powdered nickel hydroxide material (nickel hydroxide chemical formula is Ni(OH) 2 ) is a positive electrode active material widely used in commercial nickel-based alkaline storage batteries. Since nickel hydroxide itself is a semiconductor, when it is used in high-power applications, especially as a power source for hybrid electric vehicles, its poor conductivity directly limits its high-current charge and discharge performance . Therefore, in order to improve the conductivity of powdered nickel hydroxide, it is usually necessary to ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02H01M4/52
CPCY02E60/10
Inventor 陈卫华杨毅夫邵惠霞
Owner WUHAN UNIV
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