Scholarlink

<p>Lithium iron phosphate (LiFePO<sub>4</sub>) is one of the most promising cathode materials for lithium-ion batteries due to its low cost, environmental friendliness, and high safety. However, its low energy density significantly restricts the development of LiFePO<sub>4</sub>-based batteries. To address the issue of low energy density in LiFePO<sub>4</sub> batteries, this study aims to improve their performance by enhancing the conductivity and ion/electron diffusion rates of LiFePO<sub>4</sub> materials. LiFePO<sub>4</sub>/C composites were successfully prepared by wet ball milling, spray drying, and carbothermal reduction method using homemade Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O as the precursor, with a focus on investigating the effects of precursor morphology on the LiFePO<sub>4</sub>/C composites’ properties. Spherical Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O with enhanced crystallinity and reduced particle size was synthesized by introducing polyvinylpyrrolidone (PVP) into the co-precipitation process, followed by spray drying. The spherical precursor yielded LiFePO<sub>4</sub>/C composites that are impurity-free, feature high crystallinity, smaller primary particles, and uniform surface element distribution. The LiFePO<sub>4</sub>/C composites exhibited high tap density, low specific surface area, and excellent electronic conductivity, which collectively enhance ion/electron diffusion. Electrochemical tests demonstrate the superior performance of the LiFePO<sub>4</sub>/C composites: a powder conductivity of 3.51 × 10<sup>–2</sup> S·cm<sup>−1</sup>, a Li⁺ diffusion coefficient of 4.4 × 10<sup>–12</sup> cm<sup>2</sup>·s<sup>−1</sup>, a discharge specific capacity of 161.9 mAh·g<sup>−1</sup> at 0.2 C, ~ 82.5% capacity retention (5 C vs 0.2 C), and ~ 101.3% retention at 5 C over 100 cycles.</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

The effect of Fe3(PO4)2·8H2O precursor morphology on the performance of LiFePO4/C cathode materials

  • 期刊论文

  • 发表日期：

    2026年6月1日

查看全文
  • Ruqian Ding,
  • Yi Zheng,
  • Guangchuan Liang

摘要

Lithium iron phosphate (LiFePO4) is one of the most promising cathode materials for lithium-ion batteries due to its low cost, environmental friendliness, and high safety. However, its low energy density significantly restricts the development of LiFePO4-based batteries. To address the issue of low energy density in LiFePO4 batteries, this study aims to improve their performance by enhancing the conductivity and ion/electron diffusion rates of LiFePO4 materials. LiFePO4/C composites were successfully prepared by wet ball milling, spray drying, and carbothermal reduction method using homemade Fe3(PO4)2·8H2O as the precursor, with a focus on investigating the effects of precursor morphology on the LiFePO4/C composites’ properties. Spherical Fe3(PO4)2·8H2O with enhanced crystallinity and reduced particle size was synthesized by introducing polyvinylpyrrolidone (PVP) into the co-precipitation process, followed by spray drying. The spherical precursor yielded LiFePO4/C composites that are impurity-free, feature high crystallinity, smaller primary particles, and uniform surface element distribution. The LiFePO4/C composites exhibited high tap density, low specific surface area, and excellent electronic conductivity, which collectively enhance ion/electron diffusion. Electrochemical tests demonstrate the superior performance of the LiFePO4/C composites: a powder conductivity of 3.51 × 10–2 S·cm−1, a Li⁺ diffusion coefficient of 4.4 × 10–12 cm2·s−1, a discharge specific capacity of 161.9 mAh·g−1 at 0.2 C, ~ 82.5% capacity retention (5 C vs 0.2 C), and ~ 101.3% retention at 5 C over 100 cycles.