All metal Al-based aqueous batteries [symmetric Al batteries, Al-carbon fiber paper batteries, and Al-MnO2 batteries] were assembled in atmospheric environment using a coin 2032-type battery model. Glass fiber or Celgard 3501 was used as separator. To prepare MnO2 cathodes, MnO2, Super P, and polyvinylidene fluoride with a weight ratio of 70:20:10 were mixed with N-methylpyrone (NMP) and painted on carbon fiber paper or Ti foil. The cathode was obtained after removing NMP at 80°C overnight. The areal loading of MnO2 is about 2 mg/cm2.

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