Dr. Garvin Von Eschen worked on this back in the day. I learned propulsion chemistry from him at the Ohio State University.
It is my understanding a Cryogenic hydrogen liquid with nanoparticles of passivated fluorine and lithium suspended in them would form a type of mono propellant milkshake that explodes when warmed. This approach was used by Rocketlab high density mono propellant consisting of hydrogen peroxide and passivated carbon nanoparticles 1.7 g/cc that explodes when mixed with catalysts.