The P2-type manganese-rich layered oxides have emerged as highly promising cathode materials for sodium-ion batteries owing to their exceptional advantages including high specific capacity and low production cost. However, significant challenges remain for their practical applications, particularly concerning the capacity degradation under deep desodiation conditions and the structural sensitivity to calcination temperatures during material synthesis. In this study, we successfully fabricated a P2/P3 biphasic Na0.67Mn0.9Ni0.1O2 (designated as NMNO-800) cathode material through a carefully controlled self-propagating combustion synthesis method with precise temperature regulation. Comprehensive XRD characterization revealed that the calcination temperature plays a critical role in phase formation: NMNO-700 (calcined at 700 ℃) exhibited a pure P3-phase structure with R3m space group, while NMNO-900 (calcined at 900 ℃) showed a pure P2-phase structure with P63/mmc space group. Remarkably, the NMNO-800 sample calcined at the optimal temperature of 800 ℃ demonstrated a well-defined and stable P2/P3 biphasic structure, with the phase ratio quantitatively determined to be 42.2% P2-phase and 57.6% P3-phase through Rietveld refinement analysis. SEM observations further confirmed that the NMNO-800 material possesses a unique hierarchical nano-micro composite architecture, consisting of well-dispersed micron-sized particles ranging from 1.94 to 2.57 μm in diameter, with numerous nanoparticles uniformly distributed on the surface of these micron-scale sheet-like particles. This ingenious designed biphasic Na0.67Mn0.9Ni0.1O2 successfully combines the advantageous features of both P2 and P3 phases, maintaining the excellent structural stability characteristic of P2-phase while preserving the high initial capacity inherent to P3-phase, thereby achieving superior electrochemical performance. Specifically, the NMNO-800 cathode delivered an outstanding reversible capacity of 165.44 mAh/g at 0.2 C rate, maintained a respectable capacity of 89.18 mAh/g even at an extremely high rate of 10 C, and showed excellent cycling stability with 84.2% capacity retention after 100 cycles at 0.5 C rate, significantly outperforming all single-phase counterparts. Studies indicate that the P2/P3 biphasic structure enhances the rate performance of manganese-rich layered oxide cathode materials, improves sodium ion diffusion efficiency, and maintains good cycling stability.
Zhang Qingtang
,
Du Chunyang
,
Gao Pengfei
,
Wang Xiaomei
. Self-propagating combustion synthesis and sodium storage performance of manganese-rich P2/P3 biphasic Na0.67Mn0.9Ni0.1O2[J]. Acta Chimica Sinica, 0
: 20251203
-20251203
.
DOI: 10.6023/A25080290
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