Zinc-nickel secondary cell and preparation method thereof

Abstract

This invention relates to a preparation method for ZnNi secondary cell and the cell prepared by the said method which is to isolate the positive and negative plates by diaphragm paper to be put into cell shell after being laminated and winded and fill in electrolyte, the positive plate contacts with the shell of positive collector, the negative is connected with the negative cap in weld via conductive terminal, finally go on with sealing, packing and storage, with the advantags of high voltage, large discharge capacitance, long circulation life, small internal resistance, excellent large current discharging performance.

Description

(1) Technical field [0001] The invention relates to the field of chemical power sources, in particular to a preparation method of a zinc-nickel secondary battery. [0002] The invention also relates to the zinc-nickel secondary battery prepared by the method. (2) Background technology [0003] In recent years, with the rapid development of human society and economy, high-tech products such as laptop computers, portable communication devices, cordless power tools, digital cameras, and video cameras have developed rapidly. The research and development of the supporting mobile chemical power supply has just become an urgent problem to be solved. Under normal circumstances, these portable electronic and electrical products require the supporting chemical power supply to have high operating voltage, high specific energy, large operating current, long cycle life, small size, safety and low cost. price and other advantages. [0004] People have studied the zinc-nickel battery sy...

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Problems solved by technology

[0006] (1) The production process of the positive electrode of the battery is relatively complicated, and the quality of γ-type nickel oxyhydroxide is difficult to control;

[0007] (2) The density of γ-type nickel oxyhydroxide is small, resulting in a small loading capacity per unit volume of the positive electrode active material and a low battery capacity;

[0008] (3) Due to the low density of gamma-type nickel oxyhydroxide, the electrical conductivity is poor, the internal resistance of the battery is large, and the high-current discharge performance is poor;

[0009] (4) Mechanically mixing gamma-type nickel oxyhydroxide with conductive material graphite powder to make a powder ring as the positive electrode, the conductivity of this positive electrode is also poor;

[0010] (5) Zinc paste is used as the negative electrode of the battery, and the copper needle is used as the negative electrode current collector. The contact area between the copper needle and the zinc paste is small, the contact resistance is large, and the polarization is large, resulting in a large resistance of the negative electrode, low operating voltage of the battery, and heat generation. bigger

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