Why did early lithium-ion batteries short-circuit?

Added: 2026-05-05

[00:00:00]Another scientist at Stanford named Stan Whittingham announced that he had discovered how to make the first rechargeable lithium ion battery. Okay.

[00:00:12]So this battery had lithium aluminum as the anode and titanium disulfide as the cathode. Okay.

[00:00:21]At the molecular level, titanium disulfide has a layered structure. And so when the battery was being discharged, lithium ions would travel from the anode and get stored in between the layers of the titanium disulfide cathode. So I was imagining it kind of like a parking garage that has many levels. Uh Stan Whittingham coined this as intercalation. So the ions are being intercalated into the titanium disulfide.

[00:00:53]When the battery was being charged, the lithium ions would leave the layers and go back to be deposited on the lithium aluminum metal anode. Okay.

[00:01:04]There was a fatal flaw though in Whittingham's design.

[00:01:08]When the lithium ions moved back to the lithium aluminum anode when the battery was recharging, it wouldn't deposit evenly.

[00:01:18]And so that meant that over time these spikes called dendrites would start to form on the lithium anode. And over time, the spikes would pierce through the separator in the battery causing it to short circuit. And this is where John comes in.