Abstract
The aqueous micro batteries (AMBs) are expected to be one of the most promising micro energy storage devices for its safe operation and cost-effectiveness. However, the performance of the AMBs is not satisfactory, which is attributed to strong interaction between metal ions and the electrode materials. Here, the first AMBs are developed with NH(4) (+) as charge carrier. More importantly, to solve the low conductivity and the dissolution during the NH(4) (+) intercalation/extraction problem of perylene material represented by perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA), the Ti(3) C(2) T(x) MXene with high conductivity and polar surface terminals is introduced as a conductive skeleton (PTCDA/Ti(3) C(2) T(x) MXene). Benefitting from this, the PTCDA/Ti(3) C(2) T(x) MXene electrodes exhibit ultra-high cycle life and rate capability (74.31% after 10 000 galvanostatic chargedischarge (GCD) cycles, and 91.67 mAh g(-1) at 15.0 A g(-1) , i.e., capacity retention of 45.2% for a 30-fold increase in current density). More significantly, the AMBs with NH(4) (+) as charge carrier and PTCDA/Ti(3) C(2) T(x) MXene anode provide excellent energy density and power density, cycle life, and flexibility. This work will provide strategy for the development of NH(4) (+) storage materials and the design of AMBs.