ALL-SOLID-STATE IRON-AIR BATTERY

Abstract

The present invention relates to an all-solid-state iron-air battery, which comprises a positive electrode, a negative electrode, a separator and a solid electrolyte, wherein the positive electrode and the negative electrode are respectively arranged on opposite sides of the solid electrolyte; the separator is arranged between the negative electrode and the solid electrolyte to form a sandwich structure; the negative electrode is a ferrate material formed from an alkali metal-doped iron oxide; the positive electrode is a metal or a metal oxide material with an efficient redox catalytic activity; the solid electrolyte is an electrolyte material capable of efficiently conducting oxygen ions; and the separator is a film-like or sheet-like material having oxygen ion conduction and electronic insulation performances. According to the all-solid-state iron-air battery of the present invention, in the negative electrode, by introducing the alkali metal into an iron oxide crystal lattice by means of doping, the electrochemical reaction activity of the iron electrode can be remarkably improved, the potential safety hazard problem caused by battery overcharging is improved, and the performance of the iron-air battery is remarkably improved; and the separator is arranged between the solid electrolyte and the negative electrode, such that the battery electric leakage problem can be effectively relieved.

Claims

1. An all-solid-state iron-air battery, comprising a positive electrode, a negative electrode, a separator and a solid electrolyte, wherein the positive electrode and the negative electrode are respectively arranged on opposite sides of the solid electrolyte; the separator is arranged between the negative electrode and the solid electrolyte to form a sandwich structure; the negative electrode is a ferrate material formed from an alkali metal-doped iron oxide; the positive electrode is a metal or a metal oxide material with an efficient redox catalytic activity; the solid electrolyte is an electrolyte material capable of efficiently conducting oxygen ions; and the separator is a film-like or sheet-like material having oxygen ion conduction and electronic insulation performances.

2. The all-solid-state iron-air battery according to claim 1, wherein the positive electrode is at least one metal or metal oxide conductive material selected from a group consisting of silver, platinum, lanthanum strontium manganese oxygen, lanthanum strontium ferrite cobalt oxygen and barium strontium cobalt ferrite.

3. The all-solid-state iron-air battery according to claim 1, wherein the solid electrolyte is an oxygen ion conductor suitable for operating at the temperature of 600-1000° C.

4. The all-solid-state iron-air battery according to claim 1, wherein the solid electrolyte is at least one oxygen ion conductor selected from a group consisting of doped cerium oxide, alkali metal-doped lanthanum gallium oxygen, yttria stabilized zirconia and scandium oxide stabilized zirconia.

5. The all-solid-state iron-air battery according to claim 1, wherein the solid electrolyte is mixed with 2-4 wt % yttria stabilized zirconia or zirconia dioxide.

6. The all-solid-state iron-air battery according to claim 1, wherein the separator is zirconia or yttria stabilized zirconia.

7. The all-solid-state iron-air battery according to claim 1, wherein the negative electrode is at least one ferrite material selected from a group consisting of potassium-doped iron oxide, sodium-doped iron oxide and lithium-doped iron oxide.

8. The all-solid-state iron-air battery according to claim 1, wherein the negative electrode is mixed with yttria stabilized zirconia or zirconia dioxide.

9. The all-solid-state iron-air battery according to claim 1, wherein the all-solid-state iron-air battery further comprises a lead directly connected to the negative and positive electrodes at both ends.

10. The all-solid-state iron-air battery according to claim 1, wherein the lead wire is Ag wire, stainless steel, or Ni wire.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a structural schematic diagram of an all-solid-state iron-air battery according to a preferred embodiment of the present invention;

[0019] FIG. 2 is a schematic diagram of a battery charge-discharge curve according to Example 1 of the present invention;

[0020] FIG. 3 is a schematic diagram of a battery charge-discharge curve according to Example 2 of the present invention;

[0021] FIG. 4 is a schematic diagram of a battery charge-discharge curve according to Example 3 of the present invention;

[0022] FIG. 5 is a schematic diagram of a battery charge-discharge curve according to Example 4 of the present invention;

[0023] FIG. 6 is a schematic diagram of a battery charge-discharge curve according to Example 5 of the present invention.

DESCRIPTION OF THE ENABLING EMBODIMENT

[0024] In conjunction with the accompanying drawings, preferred embodiments of the present invention are given and described in detail below.

[0025] As shown in FIG. 1, according to a preferred embodiment of the present invention, an all-solid-state iron-air battery comprises a negative electrode 1, a separator 2, a solid electrolyte 3, a positive electrode 4 and a lead 5, wherein the negative electrode 1 and the positive electrode 4 are respectively arranged on opposite sides of the solid electrolyte 3, wherein the separator 2 is arranged between the negative electrode 1 and the solid electrolyte 3 to form a sandwich structure, and wherein the lead 5 is directly connected to the negative electrode 1 and the positive electrode 4 at the opposite ends.

EXAMPLE 1

[0026] The negative electrode 1 was potassium-doped iron oxide+YSZ (1:1), the separator 2 was ZrO.sub.2, the solid electrolyte 3 was GDC, the positive electrode 4 was Ag, and the lead 5 was Ag.

[0027] ZrO.sub.2 was deposited on one side of the GDC sheet by ion sputtering method. The negative electrode material was then coated on ZrO.sub.2. The Ag paste was then applied to the other side of the GDC sheet. The Ag wire was finally led out as the lead, wherein the ends of the Ag wire were fixed by the Ag paste. After the Ag paste was cured, the battery was put into an electric furnace at 600° C. to maintain a constant temperature for a charge-discharge test. During the test, a working electrode of the China Landian battery test system was used to connect to the positive and negative electrodes of the battery. The charging current was set to 10 mA. The charging time was set to 30 min. The discharging current was set to 10 mA. The final discharging voltage was set to 0.3V. Then the battery charge-discharge curve was obtained.

[0028] As shown by the GDC electrolyte charge-discharge curve in FIG. 2, the charging current was 10 mA, the charging voltage was about 1.08 V, the discharging current was 10 mA, and the final discharging voltage was about 0.3 V.

EXAMPLE 2

[0029] The negative electrode 1 was sodium-doped iron oxide+ZrO.sub.2 (1:1), the separator 2 was ZrO.sub.2, the solid electrolyte 3 was LSGM, the positive electrode 4 was Ag, and the lead 5 was Ag.

[0030] ZrO.sub.2 was deposited on one side of the LSGM sheet by atomic layer depositing method. The negative electrode material was then coated on ZrO.sub.2. The Ag paste was then applied to the other side of the LSGM sheet. The Ag wire was finally led out with as the lead, wherein the ends of the Ag wire were fixed by the Ag paste. After the Ag paste was cured, the battery was put into an electric furnace at 750° C. to maintain a constant temperature for a charge-discharge test. During the test, a working electrode of the China Landian battery test system was used to connect to the positive and negative electrodes of the battery. The charging current was set to 10 mA. The charging time was set to 30 min. The discharging current was set to 10 mA. The final discharging voltage was set to 0.3V. Then the battery charge-discharge curve was obtained.

[0031] As shown by the LSGM electrolyte charge-discharge curve in FIG. 3, the charging current was 10 mA, the charging voltage was about 1.13V, the discharging current was 10 mA, and the final discharging voltage was about 0.3V.

EXAMPLE 3

[0032] The negative electrode 1 was lithium-doped iron oxide+YSZ (2:1), the separator 2 was ZrO.sub.2, the solid electrolyte 3 was YSZ, the positive electrode 4 was Ag, and the lead 5 was Ag.

[0033] ZrO.sub.2 was deposited on one side of the YSZ sheet by atomic layer depositing method. The negative electrode material was then coated on ZrO.sub.2. The Ag paste was then applied to the other side of the YSZ sheet. The Ag wire was finally led out as the lead, wherein the ends of the Ag wire were fixed by the Ag paste. After the Ag paste was cured, the battery was put into an electric furnace at 850° C. to maintain a constant temperature for a charge-discharge test. During the test, a working electrode of the China Landian battery test system was used to connect to the positive and negative electrodes of the battery. The charging current was set to 10 mA. The charging time was set to 30 min. The discharging current was set to 10 mA. The final discharging voltage was set to 0.3V. Then the battery charge-discharge curve was obtained.

[0034] As shown by the YSZ electrolyte charge-discharge curve in FIG. 4, the charging current was 10 mA, the charging voltage was about 1.15V, the discharging current was 10 mA, and the final discharging voltage was about 0.3V.

EXAMPLE 4

[0035] The negative electrode 1 was potassium-doped iron oxide+YSZ (1:1), the separator 2 was ZrO.sub.2, the solid electrolyte 3 was YSZ, the positive electrode 4 was Ag, and the lead 5 was Ag.

[0036] ZrO.sub.2 was deposited on one side of the YSZ sheet by ion sputtering method. The negative electrode material was then coated on ZrO.sub.2. The Ag paste was then applied to the other side of the YSZ sheet. The Ag wire was finally led out as the lead, wherein the ends of the Ag wire were fixed by the Ag paste. After the Ag paste was cured, the battery was put into an electric furnace at 850° C. to maintain a constant temperature for a charge-discharge test. During the test, a working electrode of the China Landian battery test system was used to connect to the positive and negative electrodes of the battery. The charging current was set to 10 mA. The charging time was set to 60 min. The discharging current was set to 10 mA. The final discharging voltage was set to 0.5V. Then the battery charge-discharge curve was obtained.

[0037] As shown by the iron oxide electrode charge-discharge curve in FIG. 5, the charging current was 10 mA, the charging voltage was about 1.18V, the discharging current was 10 mA, and the final discharging voltage was about 0.5V.

EXAMPLE 5

[0038] The negative electrode 1 was potassium-doped iron oxide+YSZ (1:1), the separator 2 was YSZ, the solid electrolyte 3 was GDC+YSZ (YSZ content being 3 wt %), the positive electrode 4 was Ag, and the lead 5 was Ag.

[0039] YSZ was deposited on one side of the GDC+YSZ sheet by ion sputtering method. The negative electrode material was then applied to YSZ. The Ag paste was then applied to the other side of the GDC+YSZ sheet. The Ag wire was finally led out as the lead, wherein the ends of the Ag wire were fixed by the Ag paste. After the Ag paste was cured, the battery was put into an electric furnace at 850° C. to maintain a constant temperature for a charge-discharge test. During the test, a working electrode of the China Landian battery test system was used to connect to the positive and negative electrodes of the battery. The charging current was set to 10 mA. The charging time was set to 30 min. The discharging current was set to 10 mA. The final discharging voltage was set to 0.3V. Then the battery charge-discharge curve was obtained.

[0040] As shown by the YSZ separator charge-discharge curve in FIG. 6, the charging current was 10 mA, the charging voltage was about 1.15 V, the discharging current was 10 mA, and the final discharging voltage was about 0.5V.

[0041] The foregoing description refers to preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Various changes can be made to the foregoing embodiments of the present invention. That is to say, all simple and equivalent changes and modifications made in accordance with the claims of the present invention and the content of the description fall into the protection scope of the patent of the present invention. What is not described in detail in the present invention is conventional technical content.