探测离子电池中Na{Mn-Fe-Ni) O2阴极对电化学性能的影响
Samriddhi Saxena1, Hari Narayanan Vasavan1, Neha Dagar1
1Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, Madhya Pradesh, India.
概括
这项研究优化了离子电池的Mn-Fe-Ni层氧化物阴极. 像NaMn0.625Fe0.125Ni0.250O2这样的特定成分显示出出极好的循环稳定性和实际应用的潜力.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 分层过渡金属氧化物是离子电池的有希望的阴极材料.
- 优化过渡金属组成对于提高电化学性能至关重要.
研究的目的:
- 系统地研究Na{Mn-Fe-Ni) O2阴极的伪三极系统.
- 了解不同过渡金属部分对结构和电化学性能的影响.
- 确定高性能离子电池阴极的最佳组成.
主要方法:
- 用于结构分析的X射线衍射 (XRD).
- 电静电电荷放电和dQ/dV分析用于电化学评估.
- 传输电子显微镜 (TEM) 和操作Synchrotron XRD用于相位和转换研究.
- 电化学阻抗光谱 (EIS) 用于电荷转移电阻分析.
主要成果:
- 增加Mn含量导致两相行为;c参数的Ni含量减少;Mn和Fe晶格的扩张.
- NaMn0.500Fe0.125Ni0.375O2的特定容量达到了149 mAh g-1.
- NaMn0.500-Fe0.250Ni0.250O2表现出色的速度性能 (1°C时85.7%的容量,3°C时69.7%的容量).
- 双相NaMn0.625Fe0.125Ni0.250O2 (MFN-512) 在100个循环后保留了93%的容量.
- 在一个充满电池的MFN-512中,硬碳阳极在2.9V下输送~92mAhg−1.
- 操作XRD证实了MFN-512中的可逆相变.
结论:
- 在Mn-Fe-Ni层氧化物中,优化过渡金属比率和相位是高性能的关键.
- 系统方法为开发低成本高性能阴极材料提供了途径.
- 在实践中,MFN-512具有显著的离子电池应用潜力.
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