The Battery Cathode That Powers Every Electric Vehicle and Smartphone

This patent covers the lithium cobalt oxide cathode — the Nobel Prize–winning invention that made rechargeable lithium-ion batteries practical, enabling EVs, laptops, and smartphones.

What it covers

This patent describes a new type of battery electrode made from lithium cobalt oxide (LiCoO₂). The core idea: lithium ions can shuttle back and forth between the cathode and anode as the battery charges and discharges, without degrading the electrode structure. Previous rechargeable batteries used chemical reactions that permanently altered the electrodes — limiting the number of charge cycles before the battery died. Goodenough's intercalation approach lets the electrode act like a reversible parking lot for lithium ions, preserving its structure charge after charge. The result was a cathode that could handle hundreds of cycles at much higher voltage than previous designs, delivering far more energy per gram than anything that had come before.

What it doesn't cover

• —The complete battery — this patent covers only the cathode material (LiCoO₂), not the anode, electrolyte, or full cell design
• —NAND or silicon anodes — the complementary anode technology (graphite carbon) was developed separately
• —Lithium polymer or solid-state electrolyte variants — those use different chemistry not covered here
• —Manufacturing methods for scaling up production — the patent covers the material and electrochemical concept, not the factory process
• —Applications — the patent claims the material and its properties, not any specific use in phones or vehicles

The clever bit

Before this patent, the prevailing assumption was that rechargeable batteries required chemical reactions that consumed part of the electrode — meaning the more you charged it, the more it degraded. Goodenough's insight was that lithium ions could be stored inside a layered crystal structure without destroying it. He called this 'intercalation.' The lithium ions slip between layers of the cobalt oxide lattice like cards between books — storing charge without chemically reacting with the electrode. This preserved the cathode indefinitely and produced nearly three times the voltage of nickel-cadmium batteries. The approach was so fundamental that it forms the basis of nearly every rechargeable battery made today.

Why it matters

John Goodenough was 57 years old when he invented this cathode, working at Oxford University on funding that came from the UK Atomic Energy Authority. He never became wealthy from it — Oxford didn't file patents aggressively, and the commercial license went to Sony, which launched the first commercial Li-ion battery in 1991. Goodenough lived to 100 years old and won the Nobel Prize in Chemistry in 2019, the oldest Nobel laureate in history. The invention he made at 57 is the reason Tesla exists, the reason smartphones exist, and the reason renewable energy storage is feasible at all. Without the intercalation cathode, electric vehicles would still be too heavy, too short-ranged, and too expensive to be practical at scale.

Real-world examples

• 1.Every Tesla electric vehicle uses a battery based on this cathode chemistry — the Model S, Model 3, and Cybertruck all depend on it
• 2.The iPhone, every MacBook, and virtually every laptop and tablet since 2000 uses lithium-ion batteries descended from this work
• 3.The Nobel Committee in 2019 credited Goodenough, Whittingham, and Yoshino with creating 'the foundation of a wireless, fossil fuel-free society' — this patent is the central piece of Goodenough's contribution

Glossary