Positive particle electrode for a secondary battery and method for producing same from a nanofibre membrane structure

A method for manufacturing an active material as a positive electrode for a secondary lithium-ion battery, a sodium ion battery, or a magnesium ion battery, the method comprising the steps of:

• mixing a solvent, at least one polymer, and at least one metal precursor, to produce a solution;
• centrifuging the solution using an electric field to produce fibers;
• calcinating the fibers to a temperature between 250 to 1000° C. in an air atmosphere, an oxidizing inert atmosphere, or combination thereof, to produce calcinated fibers;
• pressing between two plates the calcinated fibers to produce a fiber membrane, wherein the calcinating step and the pressing step are done simultaneously;
• producing the positive electrode by using the fiber membrane from the previous step;
• wherein the metal precursor is selected from the group consisting of acetates, carbonates, and nitrates and includes at least two metals selected from the group consisting of alkaline metals, alkaline earth metals;
• transition metals;
• and metals from groups 13 and 14;
• and
• wherein the fibers of the fiber membrane have an average diameter between 10 to 2000 nm.