O3型NaNi1/3的合成,结构和电化学行为Mn1/3Al1/3O2
Neha Dagar1, Samriddhi Saxena1, Sonia Deswal2
1Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, 453552, India.
Electrochimica acta
|December 15, 2025
概括
这项研究探讨了Na-离子电池阴极,专注于NaNi1/3Mn1/3Al1/3O2 (NMA111) 合成. 优化的NMA111显示了下一代储能容量和稳定性的前景.
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:
- O3型层状氧化物是高容量离子电池阴极的候选物.
- 控制合成条件对于实现所需的相位形成和电化学性能至关重要.
研究的目的:
- 研究合成条件对NaNi1/3Mn1/3Al1/3O2 (NMA111) 的相位形成的影响.
- 评估合成的NMA111阴极材料的电化学特性和循环稳定性.
主要方法:
- 在850°C和受控大气中合成NMA111.
- 使用X射线衍射 (XRD) 进行相位表征.
- 电化学测试包括静电循环 (GCD),循环电量计 (CV),静电间歇定位 (GITT) 和现场电化学阻抗光谱 (EIS).
- 使用X射线光电子光谱 (XPS) 和X射线吸收光谱 (XAS) 的表面和结构分析.
主要成果:
- 获得了一个O3型相 (R
- NMA111表现出混合的离子和电子导电性.
- 初始放电容量在0.1C时为~87 mAhg-1 ,具有良好的速率能力 (在2C时为70 mAhg-1) 和循环稳定性 (在0.3C时经过100个循环后保持70%).
- 尼2+/3+氧化还原对被证实是主要电荷补偿机制.
结论:
- 合成条件显著影响NMA111.1.的相纯度和电化学性能.
- NMA111证明了作为Na-ion电池的稳定和有能力的阴极材料的潜力.
- 氧还原对在电荷-放电机制中起着至关重要的作用.
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