Lithium and plough: what they have in common

1. Step 1. Lithium — is material for — Lithium-ion battery. Lithium.
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 — uses — Sulfuric acid. The electrolyte.
4. Step 4. Sulfuric acid — is used in — Mineral fertilizer. Superphosphate is made with sulfuric acid.
5. Step 5. Mineral fertilizer — evolved from — Crop rotation. Fertilizers solved the problem of fertility that crop rotation used to solve.
6. Step 6. Crop rotation — uses — Plough. The three-field system with a heavy plough.

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