Abstract: The invention relates to the field of carbon structure production and, in particular, to a method for synthesis of graphene oxide which is widely used in electronics, medicine, pharmacology and construction industries. Provided is a method for synthesis of graphene oxide that includes oxidizing ground graphite with sulfuric acid and at least one oxidizer in a medium of supercritical fluid, wherein the method includes providing a mixture of sulfuric acid and dry ice in an amount sufficient for the mixture to solidify, and a mixture of at least one oxidizer and dry ice, wherein at least one of said mixtures contains ground graphite; introducing the provided mixtures into a high pressure autoclave; and further mixing the reagents. Thus, the claimed invention is a method for synthesis of graphene oxide that allows achieving the technical result consisting in safe production of high quality graphene oxide, wherein the time cost is relatively low and the consumption of sulfuric acid is significantly reduced.

Abstract: The invention describes the chemical technology for producing cathode materials for lithium-ion batteries. The object of this invention is to develop a simple, clean and less expensive method for producing a highly dispersed composite cathode materials based on lithium iron phosphates with a high specific product yield per reaction volume unit. The stated technical problem is solved due to the fact that in the process for producing the lithium iron phosphate comprising a mixing an iron compound with iron oxidation number in the range of +2.03÷+2.2 with the aqueous solution containing lithium and phosphate ions in the presence of carbonaceous reductant material, activating the mixture obtained to form a gel, and subsequent thermal treatment of the gel.

Abstract: The invention relates to a single crystal luminophor material for white light-emitting diodes, which is a solid solution of aluminum oxide (Al2O3) and yttrium aluminum garnet activated with cerium (Y3Al5O12:Ce) and/or rare earth elements—samarium, gadolinium, lutetium, dysprosium, and terbium.