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.
Original patent title: “Chalcogenide battery”
What this patent covers
The actual claim
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 this patent does NOT cover
The boundaries
- 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
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
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.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
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
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
The Nobel Prize in Chemistry 2019 was awarded to Whittingham, Goodenough, and Yoshino — this patent is Whittingham's central contribution
Why it matters
The bigger picture
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.
Filed
April 5, 1976
Granted
February 22, 1977
Claim 1 — Plain English
What this patent 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.
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.
What it does not 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
Patent Journey
From filing to expiry
Patent Filed
1976
Patent Granted
1977 · 1yr after filing
Highly Cited
93 patents cite this
Patent Expired
1996
PatentBrief Score
Impact Score
Moderate
Citation count
39/40
Highly cited
Claim breadth
17/20
Very broad protection
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assignee
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
The original legal language
Original claims
26 claims as filed with the patent office.
Glossary
Key terms defined
- dendrites
- Tiny needle-like lithium growths that can form during charging of metallic lithium anodes, eventually causing short circuits and fires — the key safety problem this battery had
- chalcogenide
- A compound containing sulfur, selenium, or tellurium — TiS₂ is a chalcogenide, hence the patent's title 'Chalcogenide battery'
- titanium disulfide (TiS₂)
- The layered cathode material Whittingham discovered could intercalate lithium — later replaced by lithium cobalt oxide for better performance
Citations
Patent lineage
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