Metal oxide nanostructured material and an electrochemical cell comprising the same
AssigneeNanyang Technological University
InventorsPooi See Lee, Xu Wang
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Abstract
A method for preparing a niobium, titanium or vanadium metal oxide nanostructured material is provided. The method comprises providing an aqueous reagent comprising (i) a soluble metal oxalate, and/or (ii) oxalic acid and a metal oxide precursor, adding a buffering agent to the aqueous reagent to form a mixture, and heating the mixture under hydrothermal conditions to obtain the metal oxide nanostructured material. The metal oxide nanostructured material may also be doped with a dopant metal such as titanium to enhance capacity and cycling stability. An electrode comprising the metal oxide nanostructured material, and an electrochemical cell containing the electrode are also provided.
Claims18
A method for preparing a metal oxide nanostructured material doped with a dopant metal, the method comprising:
- a) providing an aqueous reagent comprising (i) a soluble metal oxalate, and/or (ii) oxalic acid and a metal oxide precursor,
- b) adding a buffering agent and a substance comprising the dopant metal to the aqueous reagent to form a mixture,
- c) heating the mixture under hydrothermal conditions to obtain the metal oxide nanostructured material doped with the dopant metal,
- d) drying the metal oxide nanostructured material doped with the dopant metal, and
- e) annealing metal oxide nanostructured material doped with the dopant metal at a temperature in the range of about 550° C. to about 650° C. after drying, wherein the annealed metal oxide nanostructured material doped with the dopant metal comprises an orthorhombic crystalline structure.
A metal oxide nanostructured material doped with a dopant metal prepared by a method comprising
- a) providing an aqueous reagent comprising (i) a soluble metal oxalate, and/or (ii) oxalic acid and a metal oxide precursor,
- b) adding a buffering agent and a substance comprising the dopant metal to the aqueous reagent to form a mixture,
- c) heating the mixture under hydrothermal conditions to obtain the metal oxide nanostructured material doped with the dopant metal,
- d) drying the metal oxide nanostructured material doped with the dopant metal, and
- e) annealing the metal oxide nanostructured material doped with the dopant metal at a temperature in the range of about 550° C. to about 650° C. after drying, wherein the annealed metal oxide nanostructured material doped with the dopant metal comprises an orthorhombic crystalline structure.
An electrochemical cell comprising an anode and a cathode, wherein the anode comprises a metal oxide nanostructured material doped with a dopant metal prepared by a method comprising a) providing an aqueous reagent comprising (i) a soluble metal oxalate, and/or (ii) oxalic acid and a metal oxide precursor, b) adding a buffering agent and a substance comprising the dopant metal to the aqueous reagent to form a mixture, c) heating the mixture under hydrothermal conditions to obtain the metal oxide nanostructured material doped with the dopant metal, d) drying the metal oxide nanostructured material doped with the dopant metal, and e) annealing the metal oxide nanostructured material doped with the dopant metal at a temperature in the range of about 550° C. to about 650° C. after drying, wherein the annealed metal oxide nanostructured material doped with the dopant metal comprises an orthorhombic crystalline structure, and the cathode comprises a composite of an electrically conducting polymer and a carbon-based material.
Dependencies are inferred from the claim text.