Chapter 2 Battery Cathodes

Anode – (negative electrode) This electrode donates electrons during cell discharge. Battery A device consisting of one or many electrochemical cells connected together, in which chemical energy is converted into power. These can be further categorized as primary (non-rechargeable) or secondary (rechargeable) systems. Capacity The amount of charge that a battery contains, often expressed as mAh or Ah. This depends on the size of the battery and its chemistry. Rated capacity also depends on the current used. Cathode – (positive electrode) This electrode accepts electrons during cell discharge. Cell One unit of a battery, commonly consisting of an anode, a cathode, an electrolyte, a separator, and two current collectors. Energy density or specific energy Energy per unit volume or weight of a material or a device, respectively, often expressed as Wh/L or Wh/kg. Energy is a product of the cell voltage and capacity per unit volume or weight.