CoAl-layered double hydroxide nanosheets-coated spherical nickel hydroxide cathode materials with enhanced high-rate and cycling performance for alkaline nickel-based secondary batteries

SrFeO3−δ: a novel Fe4+ ↔ Fe2+ redox mediated pseudocapacitive electrode in aqueous electrolyte

“…Pseudocapacitors typically lose capacitance on repeated cycling due to their sluggish charge transfer reactions; 18,27 therefore, to assess the electrochemical stability of SrFeO 3Àd electrodes, 2500 repeated CV cycles were performed at a scan rate of 100 mV s À1 . We observed a slight increase (o3%) in the capacity retention within the first 500 cycles which we attribute to minor re-orientation of SrFeO 3Àd crystallites during the electrochemical testing in agreement with our HRTEM analysis (see following paragraph), where it is observed that the ironcontaining [111] plane of SrFeO 3Àd became preferentially oriented within crystallites of the composite electrode.…”

“…13,[15][16][17][18] Investigation of other lower-cost alternatives, such as NiO, V 2 O 5 , spinels-Co 3 O 4 and -Fe 3 O 4 , mixed spinel-NiCo 2 O 4 , and layered hydroxides-Ni(OH) 2 and -Co(OH) 2 , is being vigorously pursued, but the inherent poor electrical and ionic conductivity of these materials preclude their practical application. [19][20][21][22][23][24][25][26][27][28] Therefore, research on combining these transition-metal-containing ECs with conductive carbon and/or increasing their surface area by nanostructure engineering is very much in vogue to access the full theoretical capacitance of these materials and enhance their electrical conductivity. [29][30][31][32] Despite the large research effort on the development of high-energy, high-power ECs, an important class of oxides, perovskite-type ABO 3 , has received little attention.…”

Scalable Alkaline Zinc‐Iron/Nickel Hybrid Flow Battery with Energy Density up to 200 Wh L−1

“…Therefore, cobalt coating is an efficient strategy to enhance the electronic conductivity of spherical Ni(OH) 2 . [ 13 ] Although the commercial spherical Ni(OH) 2 cathode has the advantages of high tap density and specific capacity, the commercial route of cobalt coating often results in uneven electronic conductivity, of which the internal electronic conductivity of Ni(OH) 2 is significantly lower than that of the superficial Ni(OH) 2 . The heterogeneous electronic conductivity can easily result in the formation of γ‐NiOOH (a coproduct of overcharging), consequently, leading to volume expansion and further fragmentation of the spherical cathode material.…”

Surface Engineering of Ni wires and Rapid Growth Strategy of Ni‐MOF Synergistically Contribute to High‐Performance Fiber‐Shaped Aqueous Battery

“…Optimizing energy conversion and storage is crucial to improving the suitability of energy sources, and the widely used energy storage devices are ion batteries, supercapacitors, and alkaline aqueous batteries (AABs). [ 1–3 ] AABs are widely used in energy storage systems due to their high power density, long service life, and excellent temperature stability. In particular, with the rise of lightweight wearable devices, AABs are attracting more attention in the field of novel energy storage systems as it is easier to achieve flexibility, portability and high safety compared to other energy storage devices.…”