Aqueous lithium-ion secondary batteries; methods for fabricating composite materials of active materials for the anode; and methods for manufacturing aqueous lithium-ion secondary batteries.

Abstract

Page 1 of 1 Summary of the invention. The electrolyte solution containing water in an ionic secondary battery. Lithium containing water is charged and discharged, and the discharge process is inhibited. The degradation and operating voltage of the battery have been improved. The aqueous ionic secondary lithium reservoir consists of the anode, cathode, and... An electrolyte solution containing water, and an anode composed of composite materials. It acts on the anode and polytetrafluoroethylene, observing a series of polytetrafluoroethylene peaks...!! Fluoroethylene was found at approximately 1150 cm⁻¹ and approximately 1210 cm⁻¹ in FT-IR measurements. The composite material exhibits no observed polytetrafluoroethylene peak at approximately 729 cm⁻¹. In Raman spectroscopic measurements of composite materials.

Claims

Page 1 of 2 pages of Claims:

1. An aqueous lithium-ion secondary battery consisting of an anode, cathode, and an aqueous electrolyte solution. The anode is composed of a composite material with an anode active material and polytetrafluoroethylene, with polytetrafluoroethylene peaks observed at approximately 1150 cm⁻¹ and 1210 cm⁻¹ in FT-IR measurements of the composite, but no polytetrafluoroethylene peaks observed at approximately 729 cm⁻¹ in Raman spectroscopy measurements of the composite.

2. An aqueous lithium-ion secondary battery as described in Claims 1, where the anode active material is carbon-based.

3. An aqueous lithium-ion secondary battery as described in Claims 1 or 2, where the anode active material is particle in form with particle sizes ranging from 10 nm to 20 µm. 4.

5. Aqueous lithium-ion secondary battery under any of the claims of claims 1 through 3, where the composite material contains 10% by mass to 80% by mass of the active material for the anode and 20% by mass to 90% by mass of polytetrafluoroethylene.

6. Aqueous lithium-ion secondary battery under any of the claims of claims 1 through 4, where the anode has an anode collector and the surface of the anode collector is coated with a layer containing the active material for the anode.

7. Aqueous lithium-ion secondary battery under claim 5, where the anode collector is a graphite plate.

8. Aqueous lithium-ion secondary battery under any of the claims of claims 1 through 6, where the electrolyte is dissolved in an aqueous electrolyte solution of not less than 21 mol per kilogram of water. 9.

9. A method for the fabrication of the anode active material compound, whereby the method involves the mixing of the anode active material and polytetrafluoroethylene to obtain the mixture and the heating of the mixture to a temperature not less than the glass transition temperature and below the vaporization temperature of polytetrafluoroethylene to obtain the anode active material compound and polytetrafluoroethylene.

10. A method according to claim 9, whereby the anode active material is an active material whose main component is carbon. 11.

12. The method for manufacturing aqueous lithium-ion secondary batteries whereby the process includes the fabrication of active material composites for the anode by the method of claim 9 or 10; the fabrication of the anode using active material composites for the anode; the fabrication of the cathode; the fabrication of the aqueous electrolyte solution; and the storage of the anode, cathode, and aqueous electrolyte solution in a battery housing.

13. The method of claim 12, which subsequently involves the storage of the anode, cathode, and aqueous electrolyte solution in the battery housing to determine the battery configuration, also includes charging and discharging operations with a potential higher than that at which the aqueous electrolyte solution undergoes hydrogen degradation and the electrolyte component in the aqueous electrolyte solution undergoes SEI degradation.

14. The method of claim 12 involves charging and discharging with potentials of 1.244 volts (vs 1.244 µV) to 3.244 volts (vs 1.244 µV) to 3.244 µV ...