Lead dioxide is a chemical compound with the formula PbO2. It is a dark brown or black solid that is primarily used in batteries, particularly in lead-acid batteries. In these batteries, lead dioxide serves as the positive electrode, helping to store and release electrical energy. This compound is also utilized in various industrial applications, including as an oxidizing agent in chemical reactions. Lead dioxide can be produced through the oxidation of lead(II) oxide and is known for its ability to conduct electricity, making it valuable in electrochemical processes.