TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: A specific surface of particles is 1-500 mu mol.cm-2, preferably 5-250 mu mol.cm-2. The particles dispersed in the anhydrous composition are particles of formula (LiNi(0.5-x)Mn(1.5+x)O4), preferably (LiNi(0.4)Mn(1.6)O4). The layer of oxide comprises silicon oxide, zirconium oxide, tin oxide, aluminum oxide, titanium oxide, and cerium oxide. A recovery rate of particles is 5-95%, preferably 50-80%.x = 0-0.1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The step (i) comprises preparing a colloidal suspension of particles having a size of 200-5000 nm in the anhydrous composition. Preferred Components: The anhydrous composition comprises an organic solvent, and a chelating agent. The organic solvent comprises alcohols, n-methyl-2-pyrrolidone, dimethylformamide, ethers, glycol and/or dimethyl silicone. The alkoxide compound comprises silicon tetraethoxide, zirconium tetrapropoxide (preferred) and aluminum tripropoxide. The chelating agent comprises saturated and unsaturated beta -diketones, preferably acetylacetone or 3-allylpentane-2,4-dione, and beta -ketoesters such as methacryloxyethyl acetoacetate, allyl acetoacetate or ethyl acetoacetate. A molar ratio of chelating agent and alkoxide compound is 0.01-6, preferably 0.5-2. EXAMPLE - 1 g of Lithium nickel manganese oxide compound (LiNi(0.1)Mn(1.6)O4) was dispersed in 32 ml of anhydrous isopropanol under controlled atmosphere. The dispersed compound was agitated under magnetic stirrer for 2 hours. A solution of zirconium tetrapropoxide and acetylacetone was added to the lithium nickel manganese oxide compound dispersion and stirred for 30 minutes. After 2 hours of the reaction, the mixture was centrifuged for 3 minutes at a speed of 4000 revolutions per minute. The supernatant was removed and the powder was rinsed with a large excess of isopropanol. The recovered powder was dried in an oven at 100 degrees C, under air, for 3 hours and annealed at 500 degrees C, under air, for 5 hours to obtain the particles.