This means that when it reacts with the acid, it tends to lose some of its electrons. In the parlance of chemists, metallic lead is electropositive. One of the electrodes is composed of metallic lead, the other of porous lead dioxide. In his view, when you dug deeply enough into the battery's physical chemistry, that chemistry did not explain how it worked.Ī lead-acid battery is a collection of cells, each of which contains two electrodes immersed in a strong solution of sulphuric acid. But Dr Pyykko realised that there was a problem. Indeed, it is the stuff of high-school chemistry books. Superficially, its mechanism is well understood. It was invented in 1860 and is still going strong. The lead-acid battery is one of the triumphs of 19th-century technology.
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