Method for manufacturing a lithium-polymer battery

As part of the development of advanced battery technologies, 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-polymer battery—Patent of Ukraine No. 127334. The technical result of this invention is an increase in the discharge current of the lithium-polymer battery compared to existing analogs, as well as its ability to rapidly accept charge, which significantly enhances the performance characteristics of the electrochemical power source.

The invention belongs to the field of electrical engineering and can be used in the production of lithium-polymer batteries and solid-state battery packs.

The method for manufacturing a lithium-polymer battery involves producing a gel-polymer electrolyte by dissolving butadiene-nitrile rubber in methyl ethyl ketone, to which lithium tetrafluoroborate or lithium hexafluoroarsenate is added at a concentration of 1-3 M in the electrolyte, along with lithium perchlorate at a concentration of 0.5-1.1 M in the electrolyte. The active material of the positive electrode is prepared using lithiated oxides of cobalt, nickel, iron, and manganese, with the same gel-polymer electrolyte and lithium salts at identical concentrations added. Similarly, the active material of the negative electrode is made from a carbon-based material, incorporating the same gel-polymer electrolyte and lithium salts in the same concentrations. The active materials are applied to current collectors, and the electrodes are dried to a final moisture content of 0.001% before assembling the battery.

In this process, 15-30 mass% of conductive carbon is first added to the lithiated oxide of the positive electrode, followed by mixing and mechanochemical activation in atmospheric air using a milling device with a grinding body-to-material mass ratio of (20-50):1 for 3-5 hours. Likewise, the carbon material of the negative electrode's active mass undergoes mechanochemical activation under atmospheric air conditions in a milling device with a grinding body-to-material mass ratio of (10-20):1 for 3-5 hours.

The technical result of this method is an increase in the battery's discharge current and its ability to rapidly accept charge.