High Performance Na_0.5[Ni_0.23Fe_0.13Mn_0.63]O₂ Cathode for Sodium‐Ion Batteries

Abstract

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High‐Performance P2‐Type Na2/3(Mn1/2Fe1/4Co1/4)O2 Cathode Material with Superior Rate Capability for Na‐Ion Batteries

“…[ 8,12,13 ] In contrast to the complicated phase transitions often observed in the O3 type layered compounds, [ 14,15 ] several P2 compounds with mixed transition metals retain the P2 phase in a wide range of Na content. [11][12][13]16 ] This is particularly important as good diffusivity of Na ions is expected in the P2 structure due to the large interslab distance and low Na diffusion barrier. [ 17 ] The best possible rate performance of a Na intercalation cathode is set by the intrinsic Na mobility in the structure.…”

“…Discharge capacities of 128 and 130 mAh/g were obtained at 30 C rate in SCFD and FCFD mode, respectively, which are much larger than any previously reported layered oxide as is shown in Figure 2 f, which compares the rate capability of this material to the performance of other layered materials. [ 7,[11][12][13][23][24][25] The structure evolution of P2-MFC during Na + intercalation/ deintercalation was investigated with in situ XRD as shown in Figure S3, Supporting Information. Figure 3 shows the evolution of the characteristic 002 peak and corresponding interslab distances during the initial charge/discharge process.…”

Layered Oxide Cathodes for Sodium‐Ion Batteries: Phase Transition, Air Stability, and Performance

“…Mn 4+ in the layered lattice serves as a structural stabilizer to improve the cycling stability without electrochemical capacity contribution. [207,208] In addition, the [209] Another promising air-stable O3-NaNi 1/3 Fe 1/3 Mn 1/3 O 2 exhibits smooth charge/discharge curves and reversible capacity of 120 mA h g −1 with good cycling stability. The structural evolution of Na 1−x Ni 1/3 Fe 1/3 Mn 1/3 O 2 depends on the cutoff voltage.…”

Recent Progress in Electrode Materials for Sodium‐Ion Batteries

“…13 Mn 0.63 ]O 2 also delivered high discharge capacities of 180 mA h g −1 at 0.1 C and 60 mA h g −1 at 5 C with a relatively stable cycle performance. [ 50 ] Adv. Energy Mater.…”