tailieunhanh - Influence of positive active material type and grid alloy on corrosion layer structure

Performance of a valve regulated lead/acid battery is affected by the properties of the positive grid corrosion layer. An investigation has been carried out using a range of experimental techniques to study the influence of corrosion layer composition and structure on cyclic performance. A number of designs of battery were manufactured with different grids and positive active materials (PAMs). | Journal of Power Sources 111 2002 23-38 Influence of positive active material type and grid alloy on corrosion layer structure and composition in the valve regulated lead acid battery . Balla R. Kurianb R. Evansc R. Stevensa aDepartment of Engineering and Applied Science University of Bath Bath BA2 7AY UK b Hawker Ltd. Stephenson St. Newport NP9 0XJ UK c Invensys Westinghouse site Chippenham Wiltshire SN15 1SJ UK Received 9 September 2001 received in revised form 4 March 2002 accepted 11 March 2002 Abstract Performance of a valve regulated lead acid battery is affected by the properties of the positive grid corrosion layer. An investigation has been carried out using a range of experimental techniques to study the influence of corrosion layer composition and structure on cyclic performance. A number of designs of battery were manufactured with different grids and positive active materials PAMs . Two grid types were used consisting of either pure lead or a lead tin alloy. Variations in PAM composition and structure were obtained by forming electrodes from grey oxide pastes containing additions of red lead tetrabasic lead sulphate or sulphuric acid sulphated . Results indicated that both grid alloy composition and PAM type affect the corrosion layer properties. Ultra-microtoming was used to prepare sections of the grid corrosion layer interface. Results showed that corrosion propagated along tin rich grain boundaries. 2002 Elsevier Science . All rights reserved. Keywords VRLA Corrosion layer EPMA Ultra-microtoming 1. Introduction The corrosion layer is one of the most important components of the positive electrode. Its properties will influence battery operation since electrons generated must flow through it. The ease with which electrons can flow is dependant on geometry composition structure and thickness. High currents can be generated as a result of the large difference in surface area between the positive active material PAM and grid. For a typical grid .

• Điện - Điện tử
• Journal of Power Sources
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