Method for manufacturing a lithium-ion battery

Scientists from the Institute of Transport Systems and Technologies of the National Academy of Sciences of Ukraine have developed and patented a new method for manufacturing a lithium-ion battery—Patent of Ukraine No. 124370. This method differs from known technical solutions by incorporating a new-type separator composed of two hydrophilic layers with specific thickness and porosity parameters to prevent lithium dendrite growth on the anode. The precise selection of additive quantities in the anode and cathode active materials, as well as the optimized manufacturing parameters, enhances battery longevity and ensures high electrical capacity. Lithium-ion batteries are considered by the R&D and Production Corporation "VESTA" as promising electrochemical power sources, with plans for future production.

The method for manufacturing a lithium-ion battery falls within the electrical engineering industry and the production of lithium-ion batteries and battery packs. It differs from known solutions by utilizing a separator composed of two hydrophilic layers with different porosities: the fiber layer adjacent to the anode has a porosity of 30-40% and a thickness of 30-50 µm, while the fiber layer adjacent to the cathode has a porosity of 60-80% and a thickness of 40-70 µm. The total separator thickness is 90-100 µm. Additionally, 2-4 mass% of lithium oxide powder is added to the conductive carbon of the anode and subjected to mixing and mechanochemical activation under partial vacuum conditions of 100-1000 Pa in a milling device with copper grinding bodies. The mass ratio of grinding bodies to processed material is (10-20):1, with activation lasting 5-10 hours. The resulting mixture is then pressed onto a copper current collector.

For the cathode, 1-2 mass% of lithium oxide powder is added to the active material and subjected to mixing and mechanochemical activation under partial vacuum conditions of 100-1000 Pa in a milling device with aluminum grinding bodies. The mass ratio of grinding bodies to processed material is (20-50):1, with activation lasting 10-20 hours. The obtained mixture is then combined with conductive carbon, mixed, and undergoes mechanochemical activation under the same conditions for 0.5-1.0 hours before being pressed onto an aluminum current collector.

This method for manufacturing a lithium-ion battery enhances its durability while maintaining high capacity.