Scholarlink

<p>The iron-based mixed polyanionic phosphate cathode material Na<sub>3</sub>Fe<sub>2</sub>PO<sub>4</sub>P<sub>2</sub>O<sub>7</sub> offers advantages such as high theoretical specific capacity, appropriate operating voltage, and minimal volume change during cycling. However, its synthesis conditions are demanding, being highly sensitive to raw material selection and calcination temperature control, making it difficult to obtain a pure-phase structure. Additionally, the material’s inherently low electronic conductivity adversely affects its electrochemical sodium storage performance. In this study, the composite of Na₃Fe₂(PO₄)(P₂O₇) and a small amount of carbon nanotubes was prepared via a spray drying method. The product is spherical in shape, with most particles measuring 8–12&#xa0;μm in size, which is the range with good flowability. The prepared sample exhibited good electrochemical performance, delivering an initial discharge specific capacity of 90.4 mAh·g<sup>−1</sup> at 0.2 C and maintaining a reversible specific capacity of 61.4 mAh·g<sup>−1</sup> even at a high rate of 20 C. Its air sensitivity was also investigated and it displayed good air resistance performance. After being exposed to air for one month, it retained 91% of its capacity after 200 cycles at 1 C.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Synthesis and electrochemical sodium storage performance of mixed phosphate material Na3Fe2PO4P2O7

  • 期刊论文

  • 发表日期：

    2025年10月9日

查看全文
  • Guoqiang Liu,
  • Liang Chen,
  • Zhimin Liu,
  • Quan Yu,
  • Zhenhua Zhu,
  • Meiju Zhao

摘要

The iron-based mixed polyanionic phosphate cathode material Na3Fe2PO4P2O7 offers advantages such as high theoretical specific capacity, appropriate operating voltage, and minimal volume change during cycling. However, its synthesis conditions are demanding, being highly sensitive to raw material selection and calcination temperature control, making it difficult to obtain a pure-phase structure. Additionally, the material’s inherently low electronic conductivity adversely affects its electrochemical sodium storage performance. In this study, the composite of Na₃Fe₂(PO₄)(P₂O₇) and a small amount of carbon nanotubes was prepared via a spray drying method. The product is spherical in shape, with most particles measuring 8–12 μm in size, which is the range with good flowability. The prepared sample exhibited good electrochemical performance, delivering an initial discharge specific capacity of 90.4 mAh·g−1 at 0.2 C and maintaining a reversible specific capacity of 61.4 mAh·g−1 even at a high rate of 20 C. Its air sensitivity was also investigated and it displayed good air resistance performance. After being exposed to air for one month, it retained 91% of its capacity after 200 cycles at 1 C.