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Method for improving surface conductivity of nickelous hydroxide

A nickel hydroxide and conductivity technology, which is applied in the field of improving the surface conductivity of nickel hydroxide, can solve the problems of uneven distribution of CoOOH and insufficient contact, and achieve suitable large-scale operation, improved conductivity, specific capacity and high current The effect of improving charge and discharge capacity

Inactive Publication Date: 2018-09-21
武汉倍特利科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the formed CoOOH is unevenly distributed in the electrode structure, and the contact with the nickel hydroxide particles is not good enough.

Method used

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  • Method for improving surface conductivity of nickelous hydroxide
  • Method for improving surface conductivity of nickelous hydroxide
  • Method for improving surface conductivity of nickelous hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0029] First, dissolve 0.728g of cobalt nitrate hydrate in 50mL of distilled water in the reactor, add 5g of powdered nickel hydroxide, place the reactor in a water bath at 50°C, keep stirring for 10h, cool naturally, filter, and wash with pure water Dry at 80°C for 5 hours to obtain powdered nickel hydroxide coated with divalent cobalt; mix the powdered nickel hydroxide coated with divalent cobalt with polytetrafluoroethylene emulsion in a mass ratio of 100:5 and add Appropriate amount of deionized water, mechanically stirred and mixed thoroughly to form a slurry, and then the slurry was coated on the foamed nickel current collector, dried at 80°C for 4 hours, and compacted by a roller press to obtain a bonded electrode. The test battery was composed of a formula electrode and a hydrogen storage alloy negative electrode, and then charged at a constant current of 0.05C for 20 hours, so that the divalent cobalt on the surface of the nickel hydroxide particles was oxidized during...

Embodiment 2

[0036] The only difference between this example and Example 1 is that in the reactor, 0.387g of cobalt sulfate was dissolved in 50mL of distilled water, and after adding 5g of powdered nickel hydroxide, the reactor was placed in a water bath at 48°C, and kept stirring for 9.5h , filtered after natural cooling, washed with pure water and dried at 75°C for 4 hours; the rest were basically the same as in Example 1.

[0037] Activation and charge-discharge tests were performed on the CoOOH-coated nickel hydroxide electrode material prepared in Example 2. The results showed that the 1C discharge specific capacity of the CoOOH-coated nickel hydroxide electrode prepared in Example 2 was 310mAh / g.

Embodiment 3

[0039] The only difference between this example and Example 1 is that in the reactor, 0.595g of cobalt chloride hydrate was dissolved in 50mL of distilled water, and after adding 5g of powdered nickel hydroxide, the reactor was placed in a water bath at 52°C and kept stirring 10.5h, filtered after natural cooling, washed with pure water and dried at 85°C for 5.5h; the rest were basically the same as in Example 1.

[0040] Activation and charge-discharge tests were performed on the CoOOH-coated nickel hydroxide electrode material prepared in Example 3. The results showed that the 1C discharge specific capacity of the CoOOH-coated nickel hydroxide electrode prepared in Example 3 was 308mAh / g.

[0041] The unreacted cobalt in the reaction solution involved in the method provided by the present invention can be recovered by a simple method and reintroduced into the system for use.

[0042] The method provided by the invention first utilizes the ion exchange reaction between the di...

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Abstract

The invention provides a method for improving the surface conductivity of nickelous hydroxide. The method includes the steps of adding powdery nickelous hydroxide to a water solution of dissoluble cobalt salt for cation exchange between nickel ions on the surface of the powdery nickelous hydroxide and cobalt ions in a water solution phase to form a replacement layer, and forming a CoOOH wrapping layer with conductivity on the surface of nickelous hydroxide through anodic polarization and oxidization, thereby improving the surface conductivity of nickelous hydroxide. The nickelous hydroxide electrode material prepared through the method for wrapping CoOOH has the advantages of being high in conductivity, high in charging and discharging reaction reversibility, good in large-current chargingand discharging performance and good in circulation performance.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a method for improving the surface conductivity of nickel hydroxide. Background technique [0002] Powdered Nickel Hydroxide (Ni(OH) 2 ) material is a positive electrode active material widely used in commercial nickel-based alkaline storage batteries. Nickel hydroxide itself is a semiconductor, and its poor conductivity directly limits its high-current charge-discharge performance and effective use of capacitance. In order to improve the conductivity of powdered nickel hydroxide, it is usually necessary to add conductive auxiliary materials, such as metal cobalt or cobalt oxide solids, to the ingredients when making electrodes for mixing. Among them, the action mechanism of cobalt and its various oxides is to form a CoOOH adhesion layer on the surface of nickel hydroxide particles through complex chemical processes such as dissolution, deposition, and oxidation und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/30
CPCH01M4/366H01M4/52H01M4/624H01M10/30Y02E60/10
Inventor 杨毅夫
Owner 武汉倍特利科技有限公司
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