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Research On The Preparation And Properties Of Electrode Materials In The Zinc-Silver Oxide Remote-Activated Storage Battery

Posted on:2005-01-16Degree:DoctorType:Dissertation
Country:ChinaCandidate:F M MengFull Text:PDF
GTID:1102360152455399Subject:Materials Physics and Chemistry
Abstract/Summary:PDF Full Text Request
In the present work, the methods of manufacturing electrode materials used for the remote-activated type Zn/AgO storage battery have developed. The negative zinc electrode material not only with high active but also with high stability for use in the battery can be prepared by electrodeposited process and special surface treating differing from the usual state-of-the-.art The positive AgO electrode material with high content and stability for use in the battery was manufactured by oxidizing silver nitrate with potassium peroxydisulfate(K2S2O8) in alkaline solution depending on the temperature with the time of preparation and their surface of special treating. The long-shelf storage battery comprising the bipolar electrode and centrally-activated deferred-action design possess flexible, longer storage period and high reliability so as to satisfy the need of tactic weaponry. The high active zinc powder has been achieved by controlling of the depositing current density, electrolyte temperature, reacting time, and the methods of surface treating and vacuum drying Its performance is tested by granularity distributing, oxide zinc content, SEM and resist- corrosion capability. The high active and stability AgO powder has been achieved by controlling react temperature, react time, and the surface treat methods. Its performance is tested by through thermal analysis, and the uses in the practical cell and battery. By the above work, some technologic innovation results are attend as follows: In zinc electrochemical deposition, electrode voltage's upper time may be shorter by altering cold electrolyte. If not doing in this way the electrolyte's temperature will be upper to a unusual state, and the electrodeposited zinc powder's performance will be limited.In zinc electrochemical deposition, zinc has the tendency to forming non-dense deposits. If processing parameter is not suitable, the deposition may be dense, mossy and dendritic growth. The active zinc powder can be attended at high current densities(160mA/cm2-180mA/cm2) in this work. Its surface topography is dendritic crystal, it is not suitable for the second battery, but it is very suitable for the storage primary battery.The active zinc powder will be self-ignite in air. Its surface treating with aqueous macromolecule can reduce the contact with air. The tests prove: the active zinc powder with treating keeps not only activity on work but also stability on storage. In the co-existence of active zinc and AgO, active zinc powder to be oxidized to ZnO is under 1 %.It is an excellent negative materials in the Zn/AgO storage battery. The active zinc powder don't need crush by machine. Its granularity distributing suit normal school. Its max. granule is within 110μm and average granule is 57.08μm.The less than 5% cellulose is added to the active zinc powder, which can be better for electrode. for absorbing more electrolyte within the electrode. Adding Pb2+ to electrolyte in the period of electrodeposited, the surface topography of active zinc powder is not dendritic but sponge crystal proving by SEM. The electrochemical activity of sponge crystal is less than dendritic crystal.The AgO was manufactured by oxidizing silver nitrate with potassium peroxydisulfate(K2S2O8) in alkaline solution. The reacting temperature maintain between 85℃ to 95 ℃. The excess K2S2O8 was decomposed by heating. The Adding for K2S2O8 should be accomplished during 5 minuts. The manufacturing process affect on AgO's thermal stability. The results of AgO without surface treating are similar with literature, but with surface treating possess excellent thermal stability. It's very significance to develop Zn/AgO's shelf storage periods.The different surface treating method on AgO cause different reason on electrochemical performance and thermal stability. Treating with sodium silicate aqueous, the thermal stability of AgO enhance obviously and discharge capability drop badly at the beginning of higher discharge .current density. Treating with PIB(polyisobutylene,...
Keywords/Search Tags:Zn, AgO, Electrodes Materials, Battery
PDF Full Text Request
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