PbO2, or lead(IV) oxide, is a chemical compound composed of lead and oxygen. It appears as a dark brown or black solid and is commonly used in various applications, including batteries, ceramics, and as a pigment. In batteries, PbO2 serves as a positive electrode material in lead-acid batteries, which are widely used in vehicles and backup power systems. This compound is notable for its ability to act as an oxidizing agent, meaning it can facilitate chemical reactions by accepting electrons. However, PbO2 is also toxic due to the presence of lead, making proper handling and disposal essential to avoid environmental and health risks.