Composite electrode active material having M1-xRuxO3 (M=Sr, Ba, Mg), supercapacitor using the same and fabrication method thereof

A method for fabricating a composite electrode active material comprising:

• (a) preparing a spinning solution containing a precursor of M oxide, a precursor of Ru oxide, a polymer and a solvent;
• (b) spinning the spinning solution on a collector to create a nanofiber web having M1-xRuxO3 precursor;
• and
• (c) performing heat treatment for the nanofiber web to remove the polymer so as to fabricate an electrode active material in the structure of porous nanofiber web having M1-xRuxO3,
• wherein the M comprises at least one selected from a group consisting of strontium, barium and magnesium and x is in the range of 0.05 to 0.5.

A method for fabricating a capacitor comprising:

• (a) preparing a spinning solution containing a precursor of M oxide, a precursor of Ru oxide, a polymer and a solvent;
• (b) spinning the spinning solution on a conductive substrate to fabricate a nanofiber web having M1-xRuxO3 precursor;
• and
• (c) performing heat treatment for the nanofiber web to remove the polymer so as to make an electrode active material in the structure of porous nanofiber web having M1-xRuxO3,
• wherein the M comprises at least one selected from a group consisting of strontium, barium and magnesium and x is in the range of 0.05 to 0.5.

A method for fabricating a capacitor comprising:

• (a) preparing a spinning solution containing a precursor of M oxide, a precursor of Ru oxide, a polymer and a solvent;
• (b) spinning the spinning solution on a collector to fabricate a nanofiber web having M1-xRuxO3 precursor;
• (c) performing heat treatment for the nanofiber web to remove the polymer so as to make an electrode active material in the structure of porous nanofiber web containing M1-xRuxO3;
• (d) milling the porous nanofiber web to create an electrode active material comprising nanorods, microrods, nanoparticles, fibrils having nanoparticles or fibril network;
• and
• (e) forming a layer having the electrode active material on a conductive substrate,
• wherein the M comprises at least one selected from a group consisting of strontium, barium and magnesium and x is in the range of 0.05 to 0.5.