Chu conceded that oil is a unique fuel, pairing high energy density with ease of transport.
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All three batteries use automotive-grade lithium-ion cells arranged for optimal energy density, thermal management, and safety.
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The result is a material that has an energy density of about 0.005 watt-hours per kilogram.
Hydrogen has a high energy density and is clean - burning to leave only water vapour.
But for anything much bigger, the energy density of aviation fuel still looks to be unbeatable.
One main problem is that the electrode package, also called the stack, has very low energy density.
Proponents point to the enormous energy density of the fuel (the amount of energy contained per unit).
"If you want to beat a battery, you have to beat a battery's energy density, " says Lazarus.
The Suminoe factory will start producing 3.1Ah battery cells, the highest energy density cells available in the market.
Increasing the operating voltage will boost the energy density of the composite significantly.
In liquid form, butane has an energy density of 7.4 kilowatt-hours per liter.
Energy density refers to the quantity of energy that can be contained in a given unit of volume, area, or mass.
Since then, Li-ion batteries have barely tripled their volumetric energy density, while processor transistor count has zoomed more than a thousand-fold.
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But in front of the focus, and behind it, the energy density is lower, and little or no damage is done.
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Our ability to store electricity in batteries is improving, but current low energy density makes batteries an inefficient choice for large-scale storage.
Sounds great, but there are sacrifices to be made: Li-poly batteries are more expensive, offer less energy density and fewer charge cycles.
The multi-layered sheets can achieve twice the energy density of commercial supercapacitors.
This incessant march of energy density (more energy per unit of raw material) has undeniable logic, deniable only by the illogical or irrational.
"These cutting-edge Panasonic batteries will combine with Tesla's battery pack technology to produce the highest-energy density EV battery packs in the world, " said Straubel.
This incessant march of energy density (more energy per unit of raw material) has undeniable logic extending along the entire length of the arrow of progress.
Many companies are working on coming up with better materials for the cathode or the anode in order to increase the energy density of the battery cell.
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Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.
And the low energy density of biomass--corn, switchgrass, wood, etc.
Bosch reckons that for electric cars to become universally popular, a threefold increase in energy density and a fall of two-thirds in the price of batteries will be needed.
This type of battery has an unusually high energy density, which means the units can be smaller and thus lighter for a given amount of power than traditional batteries.
DuPont and BP, riding the global wave of enthusiasm for bio-based fuels, announced today that the two companies have developed a new biofuel called biobutanol that they say has 30% more energy density than ethanol.
Instead of being stored in batteries, the electricity made by solar panels can be used to split water into oxygen and hydrogen molecules, the latter of which can be used as a fuel with high energy density.
"The results suggests that home cooks and restaurants could take an easy step toward obesity prevention by adding more fruits and vegetables and trimming the fat to decrease energy density without having to serve tiny portions, " she said.
The automakers need to come out with battery packs that can retain a greater percentage of their storage capacity for longer, cost half as much, and have improved energy density, so that they can serve many driving cycles.
United Technologies is a fuel cell leader, and David Parekh, director of the United Technologies Research Center, says that expertise has allowed the company to improve the energy density of a standard flow battery by 10 times, albeit on a small scale.
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