Transcript for scene 34 of the video " Energy Forever - 2 Fusion and Biofuels" by Rolf Witzsche - Ice Age Ahead not Global Warming  

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Lithium-7 to produce tritium

While it is possible to fission lithium-7 to produce tritium, shown as Case 2, high-energy neutrons are required for the fission to be possible. While a fusion reactor does produce high-energy neutrons that would fission lithium-7, in practice the two cannot meet. The shielding that is required of the lithium against the high thermal-flux of fusion reactions exceeding 100 million degrees, requires shielding materials that block the fast neutrons that the lithium-7 fission requires. Those materials do not exist at the present. It might be possible to produce them in the future, though little hope exists.

And on top of all that, the critical lithium is in short supply, that is required in either case to produce the fusion fuel.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche