Structural stability of aluminum stabilized alpha nickel hydroxide as a positive electrode material for alkaline secondary batteries

Degradation in polymer Ni-MH battery

“…The XRD pattern of the commercial Ni(OH)2 agrees with the XRD data [28] and literature [12,29,30]. Dai et al [12] reported that the XRD pattern of Ni(OH)2 in the discharged state, changed markedly compared to that of the original Ni(OH) 2 material. The diffraction peaks become broad, which shows that the crystallinity has decreased upon cycling.…”

“…The capacity decay in cathode mostly due to the physically changes, such as extrusion mechanism and scaling off of some active material [12][13][14][15].…”

Effect of crystallinity on the electrochemical performance of nanometer Al-stabilized α-nickel hydroxide

“…The cycle life of the nickel hydroxide electrodes were tested under 0.4 C charge-discharge rates: charging at 0.4 C for 3 h, then discharging at 0.4 C to 0.9 V. Fig. 1(a) are in accordance with those of the standard substance ␣-Ni(OH) 2 ·0.75H 2 O (JCPDS38-0715), which is identical to many contributions [21,22]. In Fig.…”

Synthesis and electrochemical performance of amorphous nickel hydroxide codoped with Fe3+ and CO 3 2−

“…Figure 6 shows the Nyquist plots of both samples (samples with and without Fe 3+ and CO 3 2− codoping) at steady state after being activated by cyclic voltammetric test. The impedance spectra of these two electrodes display a semicircle resulting from the charge transfer resistance in the high-frequency region and a slope related to the Warburg impedance appearing in low frequency [19,20]. It can be seen that the impedance of the sample codoped with Fe 3+ and CO 3 2− is smaller than of the undoped sample.…”