tailieunhanh - New approach to prevent premature capacity loss of lead-acid battery in cycle use

Pb–Ca foil laminated on rolled sheet for positive grid of lead-acid battery is proposed to prevent premature capacity loss (PCL) during charge–discharge cycling. Batteries with Pb–Ca foil laminated on positive grid had longer life during charge–discharge cycle than conventional battery, which failed early by PCL. PCL is a phenomenon due to the increase of the interfacial resistance between the positive grid and the positive active mass (PAM) during discharging by PbSO4 formation in the corrosion layer | ELSEVIER Available online at X SdenceDirect Journal of Power Sources 179 2008 799-807 New approach to prevent premature capacity loss of lead-acid battery in cycle use Ken Sawai Yuichi Tsuboi Yuichi Okada Masaaki Shiomi Shigeharu Osumi Technical Development Division Industry Business Unit GS Yuasa Power Supply Ltd. Nishinosho Kisshoin Minami-ku Kyoto 601-8520 Japan Received 3 December 2007 accepted 20 December 2007 Available online 9 January 2008 Abstract Pb-Ca foil laminated on rolled sheet for positive grid of lead-acid battery is proposed to prevent premature capacity loss PCL during charge-discharge cycling. Batteries with Pb-Ca foil laminated on positive grid had longer life during charge-discharge cycle than conventional battery which failed early by PCL. PCL is a phenomenon due to the increase of the interfacial resistance between the positive grid and the positive active mass PAM during discharging by PbSO4 formation in the corrosion layer. Positive plates suffered from PCL when the compression between the grid and the PAM was poor H2SO4 concentration at the interface was high or the corrosion layer mainly consisted of p-PbO2. Adhesion between the PAM and Pb-5 Sb alloy or Pb-1 Ca alloy was firmer than that between the PAM and Sn. Corrosion layer formed at the interface between grid material and the PAM during cycle included more a-PbO2 on Pb-5 Sb and on Pb-1 Ca than on Sn. It was found out that excellent cycle life performance with Pb-1 Ca foil against PCL is due to firm adhesion between the PAM and grid material and that a-PbO2 is formed at the interface as a result of firm adhesion of the PAM and Pb-1 Ca grid. 2007 Elsevier . All rights reserved. Keywords Lead-acid battery Premature capacity loss PCL Positive plate Grid Laminate 1. Introduction It is well known that some valve-regulated lead-acid VRLA batteries with antimony-free positive grid lose discharge capacity earlier than expected under .