在高压离子电池的LiCoPO4阴极材料上,Fe和Zn联合兴奋剂的影响
Huilin Li1, Shao-Chu Huang1, Shu-Yu Chen1
1Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. Kuang-Fu Road, Hsinchu 300044, Taiwan.
Journal of colloid and interface science
|May 5, 2024
概括
铁和的联合兴奋剂显著增强了离子电池的合金酸盐阴极材料. 这种兴奋剂改善了离子扩散,循环稳定性和整体电化学性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 合金酸盐 (LiCoPO4) 是离子电池 (LIB) 的一个有前途的阴极材料,因为它具有高的理论能量密度和稳定的结构.
- LiCoPO4的一个主要限制是离子的缓慢扩散,阻碍了其实际应用.
- 提高离子扩散对于改善基于LiCoPO4的LIBs的电化学性能至关重要.
研究的目的:
- 调查铁 (Fe) 和 (Zn) 联合兴奋剂对LiCoPO4.4电化学特性的影响.
- 为了提高LiCoPO4作为LIBs的阴极材料的离子扩散动力学和整体性能.
- 了解配材料的结构转变和循环稳定性.
主要方法:
- 合成 Fe 和 Zn 联合合的 LiCoPO4/C 材料 (LiCo0.9-xFexZnxPO4/C).
- 电化学特征包括初始容量,在100个周期内在1C保持容量以及在高电流密度 (10C) 的性能.
- 研究离子扩散速率,电化学阻抗光谱 (EIS) 和操作X射线衍射 (XRD).
主要成果:
- 配合剂的LiCo0.85Fe0.1Zn0.05PO4/C阴极的初始容量为118 mAh/g.
- 在100个循环后,在1C时实现了93.4%的优异容量保留.
- 在10C的高电流密度下保持了87mAh/g的容量,这表明提高了速率能力.
- 用Fe和Zn进行兴奋剂明显改善了离子扩散率并降低了材料的抗性.
- 运行XRD证实在循环时具有良好的结构可逆性,与增强的稳定性相关.
结论:
- 将LiCoPO4与10%的Fe和5%的Zn一起配合,可以显著提高其作为LIBs的阴极材料的电化学性能.
- 增强的性能归因于改进的离子扩散动力学和结构稳定性.
- 这项研究强调了Fe和Zn联合兴奋剂的潜力,作为优化LiCoPO4用于先进的储能应用的有效策略.
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