Research On High-performance Mesoporous Zinc Power

Compared with other alkaline battery electrode, zinc electrode has high specificenergy, low price, wide raw material sources and harmless to the environment etc.Therefore, the zinc electrode and a lot of material can be combined into chemicalpower source, widely used in the fields of aviation, military, energy etc. With thecontinuous development of modern equipment, the demand of zinc electrode is higherand higher, capacity of zinc electrode with larger discharge current density is needed.And mesoporous materials with larger specific surface area, pore size is uniform, andhas many characteristics, such as dimension and orderly.It is a good choice for us tomake zinc power into mesoporous material to zinc electrode.Using the "real liquid crystal template" mechanism developed by Attard etc., thispaper synthesized Mesoporous zinc powder using Brij56or leveling Agent O-25asthe template. The detection and analysis of morphology, Specific surface area，apparent density, tap density of synthetic Mesoporous zinc power were done, and theelectrical properties were studied. The conclusions are as follows：（1）Mesoporous zinc powder in non ionic surfactant Brij56or leveling AgentO-25concentration in a certain situation, using nonionic surfactant lyotropic liquidcrystal template, obtained by electrochemical deposition. The pore size of mesoporouszinc powder, using Brij56preparation is about5~20nm, and the pore size ofmesoporous zinc leveling Agent O-25preparation is about5~10nm.（2）The macro morphology of mesoporous zinc powder is dendrite, theelectrolytic current density and the non-ionic surface active agent categories have notaffect on the macro morphology of mesoporous zinc powder.（3）The specific surface area, the apparent density， the tap density and theamount of the generated gas of zinc power obtained by Brij56or leveling Agent O-25and regular zinc power were14.5m2/g、13.7m2/g、0.7m2/g;0.47g/cm3、0.49g/cm3、 0.50g/cm3；1.13g/cm3、0.98g/cm3、1.25g/cm3；0.09ml（/1g*3d）、0.18ml（/1g*3d）、0.78ml（/1g*3d），respectively.This means that mesoporous zinc powder is better thanconventional zinc powder in the surface area, apparent density, tap density and gasevolution.（4）Current density and the content of non-ionic surfactants have influence onthe intrinsic characteristics of mesoporous zinc powder。There is a difference inspecific surface area, apparent density, tap density and gassing rate of prepared zincpowder In the current density of100mA/cm2or150mA/cm2.but the difference is nottoo big, in general, under the current density of100mA/cm2of the preparation ofmesoporous zinc powder performance is better than that of150mA/cm2. But thedischarge performance of prepared zinc powder when the current density is150mA/cm2is slightly better than that of100mA/cm2.In the case of nonionic surfactantcontent is different, the specific surface area of the preparation of mesoporous zincpowder, apparent density, tap density and gas chromatography, etc. The performancedifference is not too big, with the increase of the ratio of nonionic surfactants andlower, in the content of leveling Agent O-25performance is better than50%in42%,58%of the worst.（5）mesoporous zinc powder prepared can satisfy the demands of high currentdensity discharge In the current density of discharge, the voltage value of themesoporous zinc powder prepared by using Brij56or leveling AgentO-25significantly greater than the conventional zinc powder for the second time. Inthe first of the current density of discharge and discharge current density duringprophase, the voltage value but less than that of conventional directelectrolysis of zinc. In the high current density discharge, the high current densitydischarge performance of mesoporous zinc powder prepared by Brij56or levelingAgent O-25is better than conventional zinc powder. And the use of mesoporous zincpowder rate is high. The non-ionic surface active agent content has great influence onthe discharge performance of zinc content.in general. Content of leveling Agent O-25’s performance in42was better than50,58was the worst, even in leveling AgentO-25content of58cannot meet the high current density discharge requirements.