Nickel oxyhydroxide/manganese dioxide composite as a candidate electrode material for alkaline secondary cells

Abstract

Nickel hydroxide and manganese dioxide are used in alkaline cells as positive electrode materials. Positive electrodes comprising a nickel oxyhydroxide/manganese dioxide composite, with modification by Bi 2 O 3 , deliver a combined reversible discharge capacity of 2.25e per metal atom (650 mAh g −1 metal content), which is higher than that realized from electrodes of either component taken singly. The composite discharges with two potential plateaux, the first appearing at 325 mV corresponds to the discharge of the nickel component, whereas the second at −600 mV is due to the manganese component. Composites of NiO(OH)/MnO 2 can be used as a new electrode material with higher discharge capacity than conventional electrodes.

Nanostructured Alpha‐Nickel Hydroxide Electrodes for High Performance Hydrogen Peroxide Sensing

“…The main differences between the alpha and beta-Ni(OH) 2 forms are the degree of lamellar organization along the c crystallographic axis and their respective basal plane distance (~8 and~4.6 ) [22,23]. The alpha phase materials present much better electrochemical behavior than the beta phase, but are thermodynamically unstable, and are gradually converted to the beta phase as a function of time and redox cycles in alkaline medium [24].…”

Oxygen Evolution Catalysis with Mössbauerite—A Trivalent Iron‐Only Layered Double Hydroxide

“…This conversion has been intensively studied by battery technologists in the context of Ni‐based alkaline secondary batteries. While the α‐/γ‐couple delivers more than 100 % charge storage capacity, it unfortunately suffers from a high self‐discharge rate . This self‐discharge is related to the catalysis of the OER by the charged phase, γ‐NiOOH.…”

“…While the a-/g-coupled elivers more than 100 %c harge storage capacity, it unfortunately suffers from ah igh self-discharge rate. [21,22] This self-discharge is related to the catalysis of the OER by the charged phase, g-NiOOH.…”

Success and serendipity on achieving high energy density for rechargeable batteries

“…Today, nickel-metal hydride (Ni-MH) technology is the principal battery used in hybrid electric vehicles [1,2] but it can be displaced by the higher-energy lithium-ion technology if the latter's lifetime, high cost of manufacture, and safety issues can be sizeably tailored. Although numerous progresses have been achieved in the development of lithium-ion technology both in terms of electrode materials and of electrolytes, problems posed on capacity fading upon cycling due to the formation of solid-electrolyte interphase by electrolyte degradation still remain [3,4].…”