The basic parameters of a lithium-ion cell are voltage, capacity, energy, and power. Cell voltage is the difference between cathode and anode potentials and thus depends on the selected active materials. Capacity (Ah) corresponds to the number of lithium ions reversibly stored in the electrodes. Energy (Wh) can be calculated as voltage times capacity. One of the most used parameters for comparing different kinds of batteries is their energy density: Wh/kg or Wh/l.
The used charge and discharge currents are usually given as so-called C-rates. 1C current equals a current which discharges the cell in one hour. Correspondingly, 2C current discharges the cell in 0.5 hours and 0.5C current in 2 hours.
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