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In this paper,we use 1,1,7-trihydrododecafluoroheptanol and ionic liquid as extraction solvent and benzo-15-crown-5 as extractant for the separation of lithium isotopes.The 1,1,7-trihydrododecafluoroheptanol is non-volatile compared with the traditional organic solvent-chloroform and insoluble in water,is beneficial to improve extraction rate.