Premature capacity loss (PCL) of the positive lead/acid battery plate: a new concept to describe the phenomenon

✍ Scribed by D. Pavlov

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 862 KB
• Volume: 42
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(93)90002-i

✦ Synopsis

When the lead-antimony grids in lead/acid batteries were substituted by lead-calcium ones, battery cycle life was dramatically shortened . This phenomenon was called first 'antimonyfree effect' and later 'premature capacity loss' (PCL), 'early capacity decline' or 'relaxable insufficient mass utilization' (RIMU) . PCL is encouraged by the following conditions : (i) lack of certain alloying additives as antimony, tin in the positive grid ; (ii) high utilization coefficient of the positive active mass ; (iii) low active mass density; (iv) no stack pressure on the positive plates in the cells, and (v) no capacity limiting role of H,SO, in the cells .

Discharge of the positive active mass (PAM) proceeds through two successive reactions :