Lithium compounds with good solubility in organic solvents? I want to dissolve enriched $\ce{^6Li}$ into a liquid scintillator (made almost purely of di-isopropyl-naphthalene, mixed isomers, with a tiny bit of fluors and wavelength shifters) for enhanced neutron detection and background rejection. My group's previous attempts at this have been to use Lithium-6 Chloride with surfactants, but this negatively affects the attenuation length of the scintillation light passing through the scintillator (since the droplets of the microemulsion are essentially giant scattering surfaces).

Having had some O-Chem and P-Chem as an undergrad I know some organolithium compounds are soluble in organic solvents, but those are eat the container walls nasty. I know that lithium bromide has some limited solubility in organic solvents, but I need to get to at least 0.1%, preferably 0.5% atom doping/fraction, so I need something that dissolves well. I know that lithium perchlorate is soluble in many organic solvents, but the explosive nature of the mixtures it makes with those solvents kills that idea.

This leads to my question:

Are there any lithium compounds that are not caustic, nor explosive, but are soluble in greasy organic liquids (like di-isopropyl-naphthalene)?
Under inert conditions you may try dissolving pure metallic lithium. Lithium forms naphtalenide salt , I don't see why di-isopropyl-naphthalene should be any different. 

Another option would be use of 12-crawn-4, which make a lot of salts lipo-soluble. Presence of TMEDA (tetramethylethilendiamine) should affect solubility of many lithium salts as well, though I would focus on salts like benzoate or perchlorate.