Lithium fission is being explored for subcritical reactors. The fission of lithium ions by bombarding them with neutrons results in excess energy, tritium atoms, and helium atoms.
It would be an amazing thing if widespread energy generation via subcritical fission of lithium also helped solve the “finite helium” problem.
Imagine a world where old lithium batteries can be recycled and create H^3 and He^4 and also generate clean energy.