Intercalation and tank: what they have in common

1. Step 1. Intercalation — is used in — Lithium-ion battery. Lithium ions reversibly enter the lattice of the graphite and the cathode.
2. Step 2. Lithium-ion battery — evolved from — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
4. Step 4. Submarine — has part — Periscope. A periscope.
5. Step 5. Periscope — is part of — Tank. Observation devices.

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