Figure 2
Charging sequence (first row) using a power supply with a voltage \(v_c(t)=V_{cc} \left( {t}/{t_{ss}}\right) ^{p}\), and discharging sequence (second row) into a constant 100 \(\Omega\) resistor of an NEC/TOKIN supercapacitor. (a),(b) depict the charge/discharge voltage patterns for different values of p (1.0, 0.7, 0.4, 0.2 and 0.1) and \(t_{ss}=550\) s (Table 1), i.e. \(A^c_{10}\)/\(A^d_{10}\)-\(A^c_{07}\)/\(A^d_{07}\)-\(A^c_{04}\)/\(A^d_{04}\)-\(A^c_{02}\)/\(A^d_{02}\)-\(A^c_{01}\)/\(A^d_{01}\). (c),(d) and (e),(f) show the repeatability of the process for four consecutive cycles (4x, superimposed on top of each other) of charge/discharge with \(p=1.0\) and \(p=0.1\); in (c),(d) waveforms \(A^c_{10}\)/\(A^d_{01}\)-\(A^c_{10}\)/\(A^d_{01}\)-\(A^c_{10}\)/\(A^d_{01}\)-\(A^c_{10}\)/\(A^d_{01}\), and in (e),(f) waveforms \(E^c_{10}\)/\(E^d_{01}\)-\(E^c_{10}\)/\(E^d_{01}\)-\(E^c_{10}\)/\(E^d_{01}\)-\(E^c_{10}\)/\(E^d_{01}\). In (g),(h), we applied the sequence of charge/discharge codes [\(B^c_{10}\)/\(B^d_{10}\)- \(C^c_{05}\)/\(C^d_{05}\)- \(D^c_{01}\)/\(D^d_{01}\)]–[\(B^c_{10}\)/\(B^d_{10}\)- \(C^c_{05}\)/\(C^d_{05}\)- \(D^c_{01}\)/\(D^d_{01}\)]–[\(C^c_{05}\)/\(C^d_{05}\)- \(D^c_{01}\)/\(D^d_{01}\)- \(B^c_{10}\)/\(B^d_{10}\)]–[\(C^c_{05}\)/\(C^d_{05}\)- \(D^c_{01}\)/\(D^d_{01}\)- \(B^c_{10}\)/\(B^d_{10}\)] using three values of \(t_{ss}\) and three values of p (Table 1) demonstrating the possibility of two-dimensional encoding as well as the repeatability of the process (\(4\times\)).
