Lithium Battery Weight and Energy Density Comparison
Some lithium batteries are lighter but store less energy, while others are heavier but pack in more power per unit. Understanding this balance is essential when choosing a
Lithium battery energy density measures how much energy a battery can store relative to its weight or size. There are two main types: Gravimetric energy density (Wh/kg): Energy per kilogram of battery. Volumetric energy density (Wh/L): Energy per liter of battery volume. High gravimetric energy density = more energy with less weight.
Industry organizations, define energy density as the ratio of a battery's energy to its weight or volume. This metric is sometimes called power density, but in most technical contexts, energy density is the standard term.
At present, the publicly reported highest energy density of lithium-ion batteries (lithium-ion batteries in the traditional sense) based on embedded reactive positive materials is the anode-free soft-pack battery developed by Professor Jeff Dahn's research team (575 Wh kg −1, 1414 Wh L −1) .
The cathode is combined with lithium metal anode to build a high energy density all-active substance all-solid-state battery. In this new all-solid-state metal lithium battery, the energy density at the material level can be 100 % utilized at the electrode level.
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