The First Rechargeable Lithium Battery — Built at an Oil Company

M. Stanley Whittingham's lithium chalcogenide battery at Exxon in 1977 was the world's first practical rechargeable lithium cell — the discovery that started the Nobel Prize–winning chain of inventions behind modern EV batteries.

What it covers

This patent describes a rechargeable battery using lithium as the anode and titanium disulfide (TiS₂) as the cathode. The key innovation is that lithium ions can travel between the anode and cathode through a liquid electrolyte — during discharge they move toward the cathode, during charging they move back — without permanently changing either electrode. Titanium disulfide was chosen because it has a layered structure that can accommodate lithium ions between its layers (intercalation) without being destroyed. This was the first demonstration that a lithium battery could be recharged rather than used once and thrown away.

What it doesn't cover

• —Lithium cobalt oxide cathodes — Goodenough's improvement (US4302518) came later and produced higher voltage
• —Graphite anodes — this used metallic lithium, which has a tendency to form dangerous dendrites during charging
• —Commercial-scale production — the battery had safety concerns with metallic lithium that prevented commercialization
• —Solid-state or polymer electrolytes — this uses a liquid electrolyte

The clever bit

Whittingham was working on superconductors when he noticed that titanium disulfide had an unusual layered crystal structure that could trap guest atoms between its layers. He realized this property could be used for energy storage — lithium ions could slip into the layers during charging and slip out during discharge, like a sponge absorbing and releasing water. The experiment worked at room temperature with high energy density. The irony: Whittingham was doing this research at Exxon, one of the world's largest oil companies, which was trying to develop alternatives to oil during the 1973 oil crisis. An oil company funded the invention that would eventually threaten its own core business.

Why it matters

This patent marks the conceptual birth of the rechargeable lithium battery. Every electric vehicle on the road today, every smartphone ever made, every laptop ever sold — all of them trace their battery lineage to Whittingham's experiment at Exxon. The safety problems with metallic lithium were later solved by Goodenough (better cathode) and Yoshino (replacing lithium with graphite anode), but the fundamental principle — lithium ions intercalating into a layered cathode — is Whittingham's. The Nobel Committee called his work the foundation of the lithium-ion battery revolution that is enabling the transition away from fossil fuels.

Real-world examples

• 1.Exxon commercialized a version of this battery in the late 1970s in early pocket calculators — though the metallic lithium anode caused fire risks that eventually halted production
• 2.This work directly inspired Goodenough to improve the cathode (LiCoO₂), which Yoshino combined with a graphite anode to create the safe, practical Li-ion battery Sony commercialized in 1991
• 3.The Nobel Prize in Chemistry 2019 was awarded to Whittingham, Goodenough, and Yoshino — this patent is Whittingham's central contribution

Glossary