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β-NaMnO2:用于离子电池的高性能阴极

Juliette Billaud¹, Raphaële J Clément, A Robert Armstrong

¹School of Chemistry, University of St. Andrews , St. Andrews, Fife KY16 9ST, United Kingdom.

Journal of the American Chemical Society

|November 15, 2014

概括

研究人员探索了β-氧化 (β-NaMnO2) 作为离子电池的阴极. 这种地球上丰富的材料显示出高容量和稳定的循环,使其成为电网存储应用的前景.

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:

与离子 (Li-ion) 电池相比,离子 (Na-ion) 电池对电网存储具有很大的兴趣,因为其预计成本较低.
开发地球上丰富的,低成本的,安全的介质阴极材料对于推进Na-ion电池技术至关重要.

研究的目的:

研究一种新型β-NaMnO2材料的电化学特性,作为纳离子电池的潜在阴极.
了解β-NaMnO2.2的结构特征和介质行为.

主要方法:

粉末X射线衍射 (XRD) 方法
高分辨率传输电子显微镜 (HRTEM) 的应用
(23) Na 核磁共振 (NMR) 光谱学
电化学循环研究电化学循环研究

主要成果:

研究的β-NaMnO2材料在C/20速率下显示出高特异容量,约为190mAhg-1.
观察到良好的速率能力,在2C速率下,其容量为142 mA h g−1.
实现了稳定的容量保留,在2°C的100个循环后提供100mA hg−1,表明尽管结构复杂,但可逆的Na间歇.

结论:

β-NaMnO2的复杂结构,包括交织的α-NaMnO2和β-NaMnO2域,支持稳定和可逆的间隔.
这种材料显示出作为电网存储应用中Na-ion电池的经济高效和高性能阴极的巨大潜力.

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