Lithium salt, method for producing the same, non-aqueous electrolyte and electrochemical cell

The invention relates to lithium salts of the general formula (I) Li[P(OR 1 ) a (OR 2 ) b (OR 3 ) c (OR 4 ) d F e ] wherein 0 < a+b+c+d ≤ 5 and a+b+c+d+e = 6, and R 1 to R 4 are independently alkyl, aryl or heteroaryl groups, wherein at least two of R 1 to R 4 may be directly linked to one another via a single or double bond, with the exception of lithium perfluoropinacolyl tetrafluorophosphonate (V). [0002] The invention further relates to a method for producing such lithium salts by reacting a phosphorus(V) compound of the general formula (II) P(OR 1 ) a (OR 2 ) b (OR 3 ) c (OR 4 ) d F e wherein 0 < a+b+c+d ≤ 5 and a+b+c+d+e = 5, and R 1 to R 4 have the meanings given above, with lithium fluoride in the presence of an organic solvent. [0003] The lithium salts according to the invention possess high oxidation potentials and are suitable for non-aqueous electrolytes of electrochemical cells, in particular lithium-ion batteries with high electrochemical stability.