This paper presents the results from a comparative study between two types of valve-regulated lead-acid
battery cells, with uncoated and polymer composite coated absorptive glass mat (AGM) separators. The
volt-ampere characteristics of the studied cells, recorded at different ambient temperatures, show that
the cells with polymer coated separators have significantly lower overcharge (recombinant) current than
the cells with conventional untreated AGM separator. During overcharge, the higher recombinant current
in the cells with plain separator leads to higher cell temperature than that of the cells with polymer
coated AGM separator.
The possibility to avoid thermal runaway (TR) is also illustrated during polarization of the cells at
2.65 V. After 320 h, a conventional cell has C/4 current (trend to TR), while the cells with composite
coating sustain low (C/26) constant current for long period of time (at least 650 h). The cycle life test
indicates stable operation of the cells with coated separator, while the conventional cell reaches high
recombinant current and thus, it is susceptible to thermal runaway phenomena
This paper presents the results from a comparative study between two types of valve-regulated lead-acidbattery cells, with uncoated and polymer composite coated absorptive glass mat (AGM) separators. Thevolt-ampere characteristics of the studied cells, recorded at different ambient temperatures, show thatthe cells with polymer coated separators have significantly lower overcharge (recombinant) current thanthe cells with conventional untreated AGM separator. During overcharge, the higher recombinant currentin the cells with plain separator leads to higher cell temperature than that of the cells with polymercoated AGM separator.The possibility to avoid thermal runaway (TR) is also illustrated during polarization of the cells at2.65 V. After 320 h, a conventional cell has C/4 current (trend to TR), while the cells with compositecoating sustain low (C/26) constant current for long period of time (at least 650 h). The cycle life testindicates stable operation of the cells with coated separator, while the conventional cell reaches highrecombinant current and thus, it is susceptible to thermal runaway phenomena
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