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Foamed nickel electrode material for great capacity power battery

A technology for power batteries and electrode materials, applied in the direction of alkaline battery electrodes, etc., can solve the problems of weak welding, complicated processes, and weak current collectors.

Inactive Publication Date: 2003-09-17
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with other substrates, it also has shortcomings, such as the direct welding of the current collector on the side of the commercially available nickel foam electrode is not firm and the strength of the foam nickel electrode is slightly poor
This method solves the problem of weak welding, but the process is more complicated, and a lot of active materials are lost, which reduces the specific capacity
In order to solve the weak welding of nickel foam electrode end face, Inco Corporation of Canada has developed a composite laminate material in the process of manufacturing nickel foam by sandwiching a layer of metal mesh between two pieces of low-density foam, or coating nickel paste on the welding tab area. When burning the foamed polyurethane skeleton, a high-density foamed nickel area is formed, so that the end face welding current collector is relatively firm (Proceedings of the 23rd National Conference on Chemical and Physical Power Sources p209-210 1998.9), but the manufacturing process It is more complicated, the cost has increased, and it has not been popularized so far
In order to increase the strength of the nickel foam electrode and reduce the breakage of the electrode during charging and discharging, high-density nickel foam is generally used now, which obviously reduces the specific capacity of the electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take four foam nickel strips (average pore diameter 110 PPI (number of holes per inch), thickness 1.6mm):

[0011] Article 1, long 10000mm, wide 47mm, one side edge is coated with metallic nickel powder slurry, wide 1mm, depth is foamed nickel thickness (1.6mm), under inert atmosphere (argon gas) 1100-1200 ℃ heat treatment, make nickel Powder bonded to nickel foam. The particle size of nickel powder is less than 300 μm, the slurry is prepared with 2.8% MC aqueous solution, and the weight ratio of nickel powder to MC is 100:0.5.

[0012] Article II is 10000mm long and 47mm wide, with a nickel wire (diameter 0.4mm) embedded in one edge.

[0013] Article III, length 10000mm, width 47mm.

[0014] Article IV, length 10000mm, width 47mm.

[0015] Four strips of nickel as Ni(OH) 2 Under the same conditions, the electrode substrate is drawn, dried, and rolled into shape with a pulper. The width of the pole strip remains unchanged (47mm) and the thickness is 0.7mm. The slur...

Embodiment 2

[0021] Completely follow the method of Example 1, inject 23ml of lye (KOH concentration 5mol / l, add 5g LiOH per liter), and assemble into a D-type battery. After three charge-discharge activations (charging at 0.2C for 7.5hr, standing for 30min, discharging at 0.2C to 1.0V), the battery discharge capacity and the median voltage of the discharge voltage platform were measured (charging at 0.7A for 16hr, standing for 30min, and then respectively 1.4A, 7.0A and 14A discharge, 1.4A, 7.0A discharge to 1.0V, 14A discharge to 0.9V), the test results are shown in Table 2:

[0022] battery number

[0023] In this experiment, the performance of the negative electrode used in the assembly of various D-type batteries is the same, and the battery is the positive limit, so the measured battery capacity and discharge voltage can be used as a relative comparison of the performance of the positive electrode. Experimental result shows, after two kinds of foamed nickel substrates of th...

Embodiment 3

[0025] cycle time

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PUM

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Abstract

A foam nickel electrode meterial for large capacity of power battery is a method of manufacturing the electrode of alkali storage battery.It is to construct the variable density position by setting 0.5-1.5 mm width of nickel nickel alloy variable density position at the middle or edge of foam nickel belt, or by inserting 0.2-1.5 mm diameter of nickel or nickel alloy wire, or 0.8-1.5 mm width and 0.1-1.0 mm thickness strip. After the electrode is formed, it can be edge welded to increase its strength and to improve its conductivity and heat conduction for large current of charging and discharging.

Description

Technical field [0001] This invention relates to the manufacture of electrodes for alkaline storage batteries. Background technique [0002] Alkaline batteries such as Ni / Cd, Ni / MH, Ni / Fe, Ni / Zn, etc. are composed of positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery case. The mixture of active material, additive and binder is coated on (inside) the conductive substrate to make positive and negative plates. Coating methods vary with substrates, such as brushing, squeegeeing, vacuum suction, extrusion, etc. The conductive substrate generally used nickel mesh, perforated nickel strip, perforated nickel-plated steel strip, etc. before, and then used foamed nickel strip. Due to the special three-dimensional network structure, large specific surface area, good seismic strength, high porosity, small pore size, uniform quality, excellent permeability and great fillability of nickel foam belt, it is preferred by high specific capacity batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/26H01M4/32
CPCY02E60/10
Inventor 曲金秋高学平吴锋袁华堂宋德瑛
Owner NANKAI UNIV