3 ms·
A flywheel-based battery, on the other hand, can reach energy densities 3-4 times higher, at around 100-130 watt-hours per kilogram. The problem is that the au
by mdasen 18y ago
A flywheel-based battery, on the other hand, can reach energy densities 3-4 times higher, at around 100-130 watt-hours per kilogram.
The problem is that the author compares fly-wheels to lead-acid batteries. Lithium-ion batteries can easily achieve 150-200Wh/kg beating flywheels. Plus, there are huge advances being made in chemical batteries such as those made by A123 Systems.
- DabAsteroid 18y ago(Energy per weight is not energy density. It is specific energy. Energy density is energy per volume.) A123 batteries are not notably high in specific-energy capacity. They are notably low in internal resistance. Big difference.
- DabAsteroid 18y agoLithium-ion batteries can easily achieve 150-200Wh/kg Li-Ion in vehicles usually involves redundancy so as to minimize the discharge-damage to the cells. The Tesla Roadster batteries weigh about 400 kg and are rated to hold about 50kWh = 125 Wh/kg. http://www.teslamotorsclub.com/technical-discussion/354-tesla-roadster-batteries.html http://www.teslamotorsclub.com/technical-discussion/354-tesl...