Sodium-ion batteries are considered to be a capable alternative for lithium-ion batteries in large-scale energy storage applications due to the earth’s abundance and low cost of sodium resources. Herein, we prepared the layered sodium chromium oxide (O3-Na_0.95CrO₂) cathode material via solid-state reaction. A far-reaching analysis of the prepared cathode material was performed for its thermal, structural, morphological, chemical, and electrochemical properties. The prepared material was indexed to rhombohedral structure with the space group of R\( \overline{3} \)m. The presence of Na-O bond was confirmed by Fourier-transform infrared (FTIR) spectra. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) revealed that quasi-polygonal particles were appeared in the sample. The layered O3-Na_0.95CrO₂ cathode material delivered an initial discharge capacity of 101 mAh g⁻¹in the voltage range 2 to 4 V at 0.1 C rate and sustained with 81 mAh g⁻¹ even after 50 cycles.

Graphical abstract

中文翻译：

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用于新兴钠离子电池的层状O3-Na 0.95 CrO 2正极材料的增强性能

钠离子电池由于地球的丰富性和钠资源的低成本而被认为是大规模能量存储应用中锂离子电池的有力替代品。在这里，我们通过固相反应制备了层状氧化铬钠（O3-Na _0.95 CrO ₂）正极材料。对所制备的阴极材料的热，结构，形态，化学和电化学性质进行了广泛的分析。准备的材料以R \（\ overline {3} \）的空间群索引到菱形结构米 Na-O键的存在通过傅立叶变换红外（FTIR）光谱确认。扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HR-TEM）显示样品中出现了准多边形颗粒。层状的O3-Na _0.95 CrO ₂正极材料在0.1 C速率下在2至4 V的电压范围内提供了101 mAh g ^-1的初始放电容量，并且即使在50次循环后仍保持81 mAh g ^-1的初始放电容量。

图形概要