Caption: Figure 6: Relationships of the rock
energy density and the strain under different confining pressure conditions.
Tesla recently announced a 90 kWh battery pack with silicon-graphite anodes and is targeting 5 percent per year improvement in
energy density by increasing the silicon content.
The strain
energy density of a homogeneous, isotropic, and elastic material is generally represented in terms of three independent stretch invariants [23].
One approach to increasing
energy density and power density is to increase surface area and thus the volumetric capacitive storage.
Bobbin-type LiSOCl2 cells feature high
energy density, high capacity, and very low self-discharge rate, permitting up to 40-year operating life for certain low power applications, including RFID asset tracking devices.
Few attempts have been made to investigate whether
energy density varies with fork length or geography.
Koratkar's team has demonstrated their experimental anode material could charge or discharge 10 times faster than conventional anodes without significant loss in
energy density.
"Since 2007, when we flew the prototype G2, the
energy density went from 163 (Wh/kg) to 185 for the same power required," he said.
We hypothesized that changes of dietary
energy density pre-partum can affect the energy metabolism during the transition period, thereafter influencing the response of an antioxidant to different
energy density diets.
Researchers noted that reducing or eliminating the type and amount of added fat (butter or sauce) to the vegetables also was a factor in the vegetables'
energy density.
Energy density may be a critical requirement, but electrochemical batteries are not a universal energy storage solution.
Regarding performance, the objective is to progressively increase the voltage of batteries and hence their
energy density. A few years ago, the average capacity of high performance batteries was 3.7V.