Which one of the following is used in storage batteries ?

Lead is the primary metal used in storage batteries, specifically the lead-acid battery, which is one of the most common types of rechargeable storage systems [1]. These batteries utilize lead in two forms: sponge lead (Pb) for the negative electrode and lead dioxide (PbO2) for the positive electrode [t1][t3]. The chemical reaction between these lead plates and a dilute sulfuric acid electrolyte allows for the storage and release of electrical energy [t2][t5]. While other metals like zinc and copper are used in basic voltaic cells or specific alkaline batteries, lead remains the standard for heavy-duty storage applications such as automotive starters, inverters, and power station backups due to its reliability and recyclability [c1][t1][t4]. Lead's unique ability to form lead sulfate during discharge and revert to its original state during charging makes it ideal for secondary (rechargeable) storage batteries [t5][t7].

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 4: Electricity: Magnetic and Heating Effects > A step further > p. 61