Application Of Carbon Nanotube In Flexible Zinc-manganese Battery

The progress of science and technology make a variety of portable personal electronic products constantly upgrading. Thinner, lighter has become the primary indicator of modern consumer electronic products. The battery must also be with the change to become thinner and lighter. At the same time, to satisfied with the requirements of scientific development, sustainable economic and environmental development, more batteries need to be miniaturization, lightweight and zero pollution to environment. In this study, we use manganese dioxide as the cathode, zinc as the anode of zinc manganese dioxide battery to prepare the flexible paper battery, in order to explore the application of carbon nanotube in flexible zinc manganese battery. In experiment, using carbon nanotubes, acetylene carbon black and graphite as conductive agent to dope in cathode materials, choosing the effective chloride electrolyte solution composition, and preparing high conductivity of carbon nanotubes as a flexible paper collector. Experiments show that, carbon nanotube is an ideal material for construction of flexible electrode, tubular structure makes carbon nanotubes as conductive agent, and the macroscopic material carbon nanotube paper as a collector, can effectively improve the performance of flexible zinc manganese battery in a certain extent.Carbon nanotubes Prepared by chemical vapor deposition, has bending clusters and surface impurities, and there are many defects in it. The use of acid treatment and graphitization treatment can effectively improve its performance, remove impurity, increase its purity, repair defects, disperse and disconnect the clusters of carbon nanotubes. Making the modification of carbon nanotubes on the performance of battery achieve the desired effect.Using carbon nanotubes, graphite, acetylene black as flexible zinc manganese battery cathode conductive agent, can improve the battery discharge time and discharge capacity. Carbon nanotubes as conductive agent, the battery in the 0.2mA discharge current, discharge time is 252 h, specific capacity reached 50.2mAh. When the zinc manganese battery discharge current increasing, the capacity of the battery will decrease. The capacity of battery without conductive agent has great loss, Up to 62.3%, and the battery capacity loss of doped conductive agent were 43.7%, 40.2%and 13.7%, doped carbon nanotube battery capacity has lest loss. Illustrating that the excellent performance of carbon nanotubes to discharge performance of battery at high current discharge. Carbon nanotube has obvious advantages and great value of application development compared with acetylene black and graphite. The application of mixed solution of zinc chloride and ammonium chloride in flexible zinc manganese battery electrolyte solution, can learn from each other. The ideal composition of electrolyte solution of zinc chloride electrolyte is about 4.9mol/L of ammonium chloride and 0.7mol/L, and in the electrolyte solution by adding a small amount of calcium chloride, can slow down the battery self discharge, and extent storage time.Using carbon nanotubes as high electrical conductivity and flexible paper collector, created a new program of making flexible zinc manganese battery. Electrochemical performance of carbon nanotube paper is superior, flexible zinc manganese battery prepared has good mechanical flexibility, curved still maintain voltage stability. Preparation of carbon nanotubes by long time high-speed shear, can make the carbon nanotubes has uniform dispersion with pulp, when the ratio of carbon nanotubes and pulp is 2:1,carbon nanotube conductive paper has better performance. The more proportion of carbon nanotubes will make the carbon nanotube clusters instead, effect conductive paper properties. Compared with the traditional collector graphite, carbon nanotubes paper as a collector in flexible zinc manganese battery increased discharge time and specific capacity and specific energy density. The resistance of flexible zinc manganese battery fluid is not the only factor to affect the discharge performance of the battery, and carbon nanotube paper after rolling density on the performance of battery has a greater impact, the density of carbon nanotube paper which is in the range of 0.6—0.7g/cm3 has the best effect,battery discharge moderate rolling can improve the conductivity and the battery discharge performance, excessive rolling will make its discharge performance drops.The new technology of the positive electrode active material is coated on the flexible zinc manganese battery carbon nanotube conductive paper collector, can effectively improve the content per unit volume in the cathode material, improve anode material accumulation and off phenomenon, and incease the battery discharge time and capacity. Although the quality of coated positive electrode active materials become more, but flexible zinc manganese batteries still maintain high specific capacity, the maximum can reach 140mAh/g. Compared to previous coating on coated paper, integration of positive electrode and the collector can reduce the cathode materials and cathode fluid directly set distance, shorten the distance between the electron transfer. The new process of flexible zinc manganese battery improved the discharge performance, and help for the development of flexible zinc manganese battery.