| Na3V2(PO4)2O2F钠离子电池正极材料的水热法制备及性能 | |
| Hydrothermal Synthesis and Electrochemical Properties of Na3V2(PO4)2O2F Cathode for Sodium-Ion Batteries | |
| 摘要: 采用水热法制备了Na3V2（PO4）2O2F（NVPOF）钠离子电池正极材料，利用X射线衍射（XRD）、扫描电子显微镜（SEM）和恒流充放电（GCD）等方法研究了其形貌、结构与电化学性能。结果显示，纯相NVPOF形貌规则，呈长1~3 μm、宽300 nm~1 μm、长宽比为2~3的四棱柱形貌。NVPOF具有2对平稳的充放电平台，在0.2C和2C电流密度下，放电比容量达到124.2和70.5 mAh·g-1，经100次循环后，放电比容量仍有105.8和59.6 mAh·g-1，容量保持率达到85.2%和84.5%，库仑效率基本在97%以上，且低温（0℃）电化学性能也有不错的表现。经还原氧化石墨烯（rGO）包覆提高电子电导率，NVPOF@rGO在0.5C和2C的室温放电比容量高达124.4和88.4 mAh·g-1，且2C倍率下循环200圈后的比容量仍有78.7 mAh·g-1，容量保持率高达89%，库仑效率始终保持在99%左右，显示出优异的倍率和循环性能。 | |
| 关键词: Na3V2(PO4)2O2F 水热法 钠离子电池 循环性能 | |
| 基金项目: 国家自然科学基金（No.62075100）和南京邮电大学校级科研基金（No.NY220052）资助。 | |
| Abstract: Na3V2(PO4)2O2F (NVPOF) sodium ion battery cathode materials were prepared by hydrothermal method, and the morphology, structure and electrochemical properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge/discharge (GCD). The results showed that as-prepared pure phase NVPOF had regular tetraprisms morphology, which was 1~3 μm in length, 300 nm~1 μm in width, and the ratio of length to width was 2~3. NVPOF showed two pairs of stable charging and discharging platforms, the discharge specific capacities of NVPOF were 124.2 and 70.5 mAh·g-1 at 0.2C and 2C at room temperature, and decreased to 105.8 and 59.6 mAh·g-1 after 100 cycles, the capacity retention rate were about 85.2% and 84.5% while the Coulombic efficiency was more than 97%. In addition, NVPOF also had good electrochemical performance at low temperature (0 ℃ ). By coating reduced graphene oxide (rGO) to increase the electrical conductivity, NVPOF@rGO presented high specific discharge capacities of 124.4 and 88.4 mAh·g-1 at 0.2C and 2C at room temperature. The specific capacity was still 78.7 mAh·g-1 after 200 cycles at 2C, and the capacity retention rate was as high as 89% while the Coulomb efficiency was always about 99%, showing excellent rate and cycling performance. | |
| Keywords: Na3V2(PO4)2O2F hydrothermal method sodium ion battery cycle performance | |
| 投稿时间：2021-01-22 修订日期：2021-04-23 | |
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| 李文君,方承豪,吕鹏,余柯涵,王中跃,韦玮.Na3V2(PO4)2O2F钠离子电池正极材料的水热法制备及性能[J].无机化学学报,2021,37(7):1204-1210. | |
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