Properties And Preparation Of Gelled Electrolyte

Lead acid battery (LAB) is employed now most widely and originally for storage battery. Because of various shortcomings of liquid electrolyte of sulfuric acid, the gelled electrolyte employed was becoming hot focus of research for lead acid battery. The research content of the thesis was properties and preparation of gelled electrolyte (GE). The research of those properties of GE was still many empties, and literatures of them less. The methods of measurements of GE were not often reported. The thesis explored some methods of measurements for physical and chemical properties of GE, and then analyzed them, which we suggested the reasonable condition and method of preparation of GE on the base of. Moreover we measured and analyzed the electric properties of lead acid battery filled GE. The following results indicate that those methods and the results related were successful.1. Physical and chemical properties of GE were measured in details for the first time.(1) While GE was destroyed by outside pressure, and then not mobile, it was gelled again, which was up to 7 times. Additives, such as PVA or PAM, could promote to some degree the properties of gelation and regelation.(2) GE could be aging when it was immobile for a long time and released a little liquid wrapped by itself. We took advantage of centrifuge for the first time accelerate aging of GE,-3-and judged the stability of GE by the quantity of liquid released from it when centrifuged for about half an hour. The results show that when the content of SiO2 was 6%, and PVA or PAM added was 5 X 10"4g/l, the quantity of liquid released from GE was the least.(3) The thixotropy of GE was measured and researched in details for the first time. The results show that the tendency of the thixotropic curve of GE at various condition and ingredient was the same. PVA or PAM added could not influence the thixotropy of GE remarkably.(4) The microstructure of GE and silica sol was observed for the first time through electric microscope. It indicated that while GE was gelled, the particles of silica sol was disappearing and transforming the net structure of gel. The net structure became symmetrical and compact.2. Measure and analyze the electric properties of GE and electrical properties of GE lead acid battery (GELAB).(1) The conductance of GE at various ingredients was measured respectively. The results show that the conductance fall 2.5~14.8?o after the electrolyte became gel. Additives, such as PVA, PAM et al. added could not influence the conductance of GE remarkably.(2) We took some experiments for preparation and filling process of GE, and discussed several factors affecting GE and GELAB. It is beneficial to GE and GELAB that PE separator was used and GE and GELAB under 50癈.(3) The electrical content and charge and discharge property of lead acid battery filled GE were primarily measured and researched. The electrical content of GELAB was almost-4-the same to battery filled liquid electrolyte and so did the charge and discharge property.