Preparation method of high-performance zinc-polyaniline secondary battery

Abstract

The invention discloses a preparation method of a high-performance zinc-polyaniline secondary battery. The preparation method comprises the following steps: preparation of a positive plate: adopting home-made graphite paper as a positive current collector, and preparing polyaniline on the graphite paper; preparation of a negative plate: adopting a home-made zinc / carbon composite material as a negative active material, mixing the zinc / carbon composite material with a conductive agent, a binder and a solvent to form a sizing agent, coating the sizing agent on the current collector, drying, roll forming and cutting into slices to prepare the cathode plate; assembling: putting the positive plate, a membrane and the negative plate into a battery shell in a laminated manner, after a pole lug is welded with a pole column, sealing the battery and injecting an electrolyte, and adding glass fiber paper for capping. The zinc-polyaniline secondary battery prepared in the invention is high in safety performance, low in preparation cost, high in utilization rate of positive and negative active substances and excellent in cycle performance.

Description

[0001] Technical field: [0002] The invention relates to the field of battery preparation, in particular to a method for preparing a high-performance zinc-polyaniline secondary battery. [0003] Background technique: [0004] Since entering the 21st century, electronic information technology has been developing by leaps and bounds all the time, various electronic and mobile communication devices have been popularized and used, and various dazzling electronic mobile devices have emerged in an endless stream. However, for these electronic devices, energy supply is a core issue, so the market's requirements for energy-providing materials are getting higher and higher. Recyclable secondary batteries are currently the main energy storage systems used in electronic information products . The acceleration of technological development has made people have higher requirements for secondary batteries. New secondary batteries must have the following characteristics: safe and stable batt...

AI Technical Summary

Problems solved by technology

[0006] The current zinc / polyaniline secondary battery has disadvantages: since most researchers use precious metal flakes as the battery matrix material when preparing polyaniline membrane electrodes, although the catalytic activity is good, the cost is so high that it cannot be used on a large scale

For the filled zinc / polyaniline battery, it is still difficult to process the polyaniline composite material into an ideal electrode. There must be enough pressure to press the electrode tightly, which requires high-voltage equipment, so the cost will be reduced. It is not suitable for large-scale production and application; the low utilization rate of active materials on polyaniline electrodes is also an important problem affecting the specific capacity of zinc / polyaniline secondary batteries. The theoretical specific capacity of zinc / polyaniline secondary batteries can reach 273mAh / g, but at present, this ideal level cannot be reached at home and abroad

The main reason for the low utilization rate is that during the discharge process of the polyaniline active material, due to the anion dedoping, the polyaniline active material on the surface is discharged, and gradually changes from a conductor to a semiconductor or even an insulator. This process leads to the polyaniline active material inside the membrane Can not be effectively utilized; in the charging and discharging process of the battery, the utilization of the polyaniline membrane electrode is generally incomplete, which is caused by the inability of the anions to diffuse into the polyaniline molecular part

In addition, the problem of cycle life and ion diffusion is a problem that restricts the development of zinc / polyaniline secondary batteries.

[0007] In order to improve the conductivity of polyaniline, polyaniline particles are often doped with carbon materials with good conductivity, which indeed improves the utilization of polyaniline to a certain extent, but this simple doping method does not guarantee that carbon materials Uniform doping into polyaniline particles

Some also use high pressure pressing, although this does improve the utilization rate of polyaniline, but the cost is high, and it is not conducive to the penetration of ions in the electrolyte