Influence of Cosurfactant on the Synthesis of Surface‐Modified Na_2/3Ni_1/3Mn_2/3O₂ as a Cathode for Sodium‐Ion Batteries

Abstract

The electrochemical performance of two Na2/3Ni1/3Mn2/3O2 samples, prepared through an oleic‐assisted emulsion procedure, is examined. The effect of cosurfactants with either short (methylamine) or long (octylamine) chains is determined for their applicability as cathode materials for sodium‐ion batteries. Their structural and morphological properties are studied by X‐ray diffraction and electron microscopy. The electrochemical performance is determined by cycling sodium half‐cells with the galvanostatic method. Particular interest is devoted to their kinetic properties evaluated by using impedance spectroscopy.

Shape‐Induced Kinetics Enhancement in Layered P2‐Na0.67Ni0.33Mn0.67O2 Porous Microcuboids Enables High Energy/Power Sodium‐Ion Full Battery

“…The cycling performance of P2‐NNMO‐PMCs is demonstrated via long‐term cycling measurement at 2 C and 5 C, as shown in Figure 2D and E, respectively. As depicted, it can deliver an initial specific capacity of 83.2 mAh g −1 with a capacity retention of 98.3 % after 300 cycles and could achieve a capacity retention of 94.6 % after cycling 1500 cycles at 5 C. The cycling performance of P2‐NNMO‐PMCs is superior when compared with other reported layered oxide cathodes (Table S3) [19,24, 43–50] . The calculated energy densities for P2‐NNMO‐PMCs electrode also exhibit an overwhelming advantage compared to P2‐NNMO‐B (Figure S11), which could be critical for full cell device.…”

“…As depicted, it can deliver an initial specific capacity of 83.2 mAh g À 1 with a capacity retention of 98.3 % after 300 cycles and could achieve a capacity retention of 94.6 % after cycling 1500 cycles at 5 C. The cycling performance of P2-NNMO-PMCs is superior when compared with other reported layered oxide cathodes (Table S3). [19,24,[43][44][45][46][47][48][49][50] The calculated energy densities for P2-NNMO-PMCs electrode also exhibit an overwhelming advantage compared to P2-NNMO-B ( Figure S11), which could be critical for full cell device. In addition, the testing potential range is further extended to 1.5-4.0 V to further investigate the effect of structural design on our P2-NNMO-PMCs.…”

Nickel‐Based Materials for Advanced Rechargeable Batteries

“…Layered NaNi x M y M' z O 2 possesses various crystal structures. P2- [206][207][208][255][256][257] and O3-type [203][204][205]258,259] layered NaNi x M y M' z O 2 materials have been extensively investigated. Because of their high Na + ion diffusion rate, P2-type cathodes exhibit high storage capability.…”

Designing a Graphene Coating-Based Supercapacitor with Lithium Ion Electrolyte: An Experimental and Computational Study via Multiscale Modeling

“…As a result, mesoporous electrode materials ensure fast ion transport [32] and yield EDLCs of high power density whereas microporous electrode materials offer high specific capacity and enrich the energy density [33]. It is also well known that size and morphology of particles, as well as how they agglomerate, have also an effect on materials performance [34]. A continuum ion transport model has been developed by our group [35] that takes into account the pore size distribution in each electrode, considering parallel ion transport equations in pores of different size as well as hierarchical interpore ion transport assuming a pore line model.…”