In the press release that cited the reasoning for the decision, Porsche reveled in the fact that they will be first car maker in the world to offer a starter battery in lithium-ion technology.
“Delivery of power by the lithium-ion battery throughout its useful charge range is likewise significantly better, providing its full power, for example, when starting the engine almost independently of the current charge level. Yet a further benefit is that a lithium-ion battery allows a significantly greater number of charging and discharging cycles, plus the two further advantages that the self-discharging effect is lower and the service life of the battery longer,” said Porsche. “The lithium-ion battery being introduced by Porsche as the pioneer in this area is made up of wound film of carbon and iron phosphate with a ceramic film moisturised by the electrolyte serving as a separating layer in between.
One of the main reasons for this move by Porsche is the weight, or lack thereof, that the lithium-ion battery features. Weighing less than 13 lbs, the new battery is more than 22 lbs lighter than a conventional 60 Ah lead battery. Aside from being lighter than it’s lead counterpart, there were several performance-related statistics mentioned by Porsche as deciding factors.
Compared with other types of lithium-ion batteries using a combination of manganese oxide, cobalt oxide or nickel, this lithium-iron-phosphate battery, as it is called, offers advantages when used as a starter battery. It is robust and consistently guarantees the usual voltage of 12 V in the car’s on-board network.”
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