The decrease of energy consumption per 1 bit processing (ε) and power supply voltage (V dd ) of integrated circuits (ICs) are long-term tendencies in micro-and nanoelectronics. In this framework, deep-sub-voltage nanoelectronics (DSVN), i.e., ICs of ∼10 11 -10 12 cm −2 component densities operating near the theoretical limit of ε, is sure to find application in the next 10 years. In nanoelectronics, the demand on high-capacity capacitors of micron sizes sharply increases with a decrease of technological norms, ε and V dd . Creation of high-capacity capacitors of micron size to meet the challenge of DSVN and related technologies is considered. The necessity of developing all-solid-state impulse micron-sized supercapacitors on the basis of advanced superionic conductors (nanoionic supercapacitors) is discussed. Theoretical estimates and experimental data on prototype nanoionic supercapacitors with capacity density δ C ≈ 100 µF/cm 2 are presented. Future perspectives of nanoionic devices are briefly discussed.