This invention develops an innovative aluminum-air battery fabricated on cellulose paper, which utilizes aluminum and ambient air for electricity generation. Its major advantages include low fabrication cost, high energy density and great environmental-friendliness. Targeted for different application fields, three battery designs are proposed. The mechanically-rechargeable battery can be used repeatedly by refreshing its aluminum anode, providing relatively high power for charging portable electronics. The flexible battery employs embedded aluminum foil inside paper as anode and deposited oxygen reduction ink on paper as cathode, which is suitable for various single-use and flexible devices. A printable battery is proposed by developing a successful aluminum ink for anode fabrication instead of the aluminum foil. Combined with existing printing techniques, this design leads to a much smarter and more economic user-define battery application in the near future.
Figure 1 From conventional Al-air battery to paper-based Al-air battery
Figure 2 Applications of the three different battery designs