Lithium (Li):
The Energy Metal.

Lightest Metal on Earth

With a density of just 0.534 g/cm³, lithium is about half as dense as water. If it didn't immediately react, a chunk of solid lithium would easily float. It is soft enough to be cut with a standard butter knife, revealing a brilliant, shiny silver surface that rapidly tarnishes to gray as it reacts with moisture and oxygen in the air.

Reactivity with Water

Like all alkali metals, lithium reacts vigorously with water to form lithium hydroxide and highly flammable hydrogen gas:

2Li(s) + 2H₂O(l) → 2LiOH(aq) + H₂(g)

Though it is the least violently reactive of the alkali metals (sodium and potassium explode much more readily), the reaction is sufficiently exothermic to melt the lithium metal and ignite the escaping hydrogen gas, producing a bright crimson-red flame.

Bipolar Disorder Treatment

For over half a century, lithium carbonate has remained the gold standard for the treatment of bipolar disorder, especially in preventing manic episodes and reducing the risk of suicide. Despite its long history, its exact mechanism of action in the brain is still not entirely understood, though it is known to regulate neurotransmitter pathways (dopamine and glutamate) and inhibit certain enzymes like GSK-3β.

Lithium Carbonate vs. Lithium Orotate

There is significant confusion around the forms of lithium available. Lithium Carbonate (Li₂CO₃) is a closely regulated prescription medication approved by the FDA for bipolar disorder.

Lithium Orotate is an over-the-counter dietary supplement where lithium is bound to an orotic acid carrier. Proponents claim it crosses the blood-brain barrier more easily, theoretically requiring a lower elemental dose. However, it lacks rigorous clinical trials verifying its safety and efficacy compared to the standard carbonate form.

White Lithium Grease

Before the EV boom, lithium was famous in garages as white lithium grease. This is a lubricating grease made from lithium soap (lithium stearate), which thickens base oils. It is prized because it adheres well to metal, resists water washout, and performs flawlessly under extreme temperatures.

Glass and Ceramics

Adding lithium to glass and ceramics makes them highly resistant to extreme temperature changes (thermal shock). This is exactly why stovetop glass and telescopic lenses often contain lithium dioxide. Additionally, lithium compounds are used as flux in metallurgy to promote the melting of metals.

Economic Forecasts

The global lithium market is inextricably tied to EV adoption rates and energy storage integration. Stocks such as Lithium Americas and Albemarle have seen extreme volatility reflecting the boom-and-bust cycle of lithium commodity pricing. As global economies mandate the phase-out of combustion engines, lithium demand is expected to quadruple by 2035, underscoring the urgency for both DLE mining advancements and closed-loop battery recycling.

Comparison with Sodium and Potassium

As the first Group 1 element, lithium shares characteristics with Sodium and Potassium, but with unique anomalies. Its high charge density means its compounds often display more covalent characteristics than the purely ionic compounds of larger alkali metals.

Nitrogen Reactivity

Unlike any other alkali metal, lithium reacts directly with pure nitrogen gas at room temperature to form lithium nitride (Li₃N). This unique property highlights the diagonal relationship lithium shares with magnesium on the periodic table.