TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compound: The compound (I) is in the form of nanoparticles. Preferred Process: The process further involves adding a super valent metal salt chosen from Nb5+, Al3+, Ti4+, Mg2+, W6+, or Zr4+, a carbon source and an organic solvent to the compound (II), (III), or to the acid scavenger. The compound (I) is annealed after being prepared. The predetermined temperature is lower than 200 (preferably 150, especially 100, particularly 15-60, more particularly 20-35) degrees C or room temperature. Preferred Components: The compound (III) is chosen from FeCl2, FeBr2, FeI2, FeF2, Fe(CN)2, Fe(SCN)2, FeSO4, Fe(CH3COO)2, or FeC2O4. The carbon source comprises carbon black, a polymer, or a carbon-rich organic compound which is soluble in the acid scavenger or nanoparticles of carbon black and/or carbon nanotubes. The carbon source comprises multi-wall carbon nanotubes or single-wall carbon nanotubes. The acid scavenger is liquid at room temperature. Preferred Method: The compound (IV) is contacted with protons generated during the synthesis of the phospho-olivine type compound and is further used as a solvent during preparation of the phospho-olivine type compound.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvent: The organic solvent is chosen from acetonitrile, dimethylformamide, tetrahydrofuran, and/or dimethoxymethane. Preferred Compound: The acid scavenger (IV) is preferably a compound of formula (IVa). SPECIFIC COMPOUNDS - Preparation of 12 compounds as (I) or (Ia) are specified e.g. LiFePO4, LiBePO4, LiMgPO4, LiBaPO4, LiCaPO4.    EXAMPLE - Ferrous acetate (Fe(CH3COO)2) (1.73 g) was dissolved in anhydrous N-methylimidazole (NMI, 50 ml) in a 250 ml two-neck flask under argon at room temperature. Then lithium dihydrogen phosphate (1.03 g) was dissolved in NMI (50 ml) at room temperature and was added dropwise to the solution of Fe(CH3COO)2 over a period of 15 minutes under argon. The resulting solution was stable against aggregation. The mixture was then heated during 2 hours at 60 degrees C to obtain lithium iron phosphate as grey particles and were filtered and dried at room temperature under vacuum overnight. The lithium iron phosphate particles can eventually be annealed.