Abstract
The aluminum current collectors from six ATD cells that were commercially fabricated and cycle-life (charge/discharge) tested at 25ºC were microscopically inspected for evidence of corrosion. The results clearly show that aluminum covered with porous cathodes of LiNi0.8Co0.15Al0.5O2 of cycle-life ATD cells cycled at 25{degree sign}C is susceptible to significant underdeposit corrosion in LiPF6-containing battery electrolytes. Aluminum current collectors of uncycled ATD cells contain mechanical pits formed during the attachment of the cathode, but with cycling at 25{degree sign}C there is an increase in percentage pit area, in the number of pits, in pit-size-distribution, and in pit depth, which is a strong evidence of corrosion of Al current collectors of ATD cells. The formation of corrosion pits, corrosion of mechanical pits, and the non negligible amount of aluminum that was found in the electrolytes (~2700 ppm) of cycle-life tested ATD cells explain the significant contribution of corrosion to the power fade and capacity fade and the possibility of mechanical degradation of the cathode as well.
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