Monitoring and quantifying morphological and structural changes in electrode materials under operando conditions
Monitoring and quantifying morphological and structural changes in electrode materials under operando conditions
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DOI：
10.1016/j.jpowsour.2020.228685
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发表时间：
2020-12
影响因子：
9.2
通讯作者：
M. Fehse;M. Hogan;Sally Hiu Tung Pang;Oliver Blackman;E. Kelder;A. Longo;M. Alfredsson
中科院分区：
文献类型：
--
作者：
M. Fehse;M. Hogan;Sally Hiu Tung Pang;Oliver Blackman;E. Kelder;A. Longo;M. Alfredsson
首次将X射线吸收光谱和小角X射线散射光谱联合应用于储能材料领域，在实验条件下同时获得了它们的光谱。这种方法允许人们密切关注电子和局部结构的演变，以及监测和量化电化学循环过程中发生的形态和纳米结构变化。在这里，我们证明了掺杂和非掺杂的Fe2O3阳极材料与锂的例子，它的潜力。我们的研究结果表明，在放电时，Fe 3+逐渐减少到金属状态，并作为纳米粒子隔离。对于再锂化反应，在随后的充电，我们观察到改善的可逆性为Sr掺杂相比，非掺杂和Ca掺杂的Fe2O3。我们强调，这种组合技术的方法是一个可靠的，方便和强大的工具，在现实的循环条件下研究电极材料。它提供了一个公正的和整体的图片的形态和结构变化发生在操作过程中，这允许适当的材料剪裁。
X-ray absorption and small-angle x-ray scattering spectra were simultaneously acquired underoperandoconditions in a joined technique approach, for the first time applied in the field of energy storage materials. This approach allows one to closely follow the electronic and local structure evolution, as well as monitor and quantify the morphological and nanostructural changes occurring during electrochemical cycling. Here we demonstrate its potential on the example of doped and non-doped Fe2O3anode material vs. Li. Our results reveal that upon discharge Fe3+is gradually reduced to the metallic state and segregated as nanoparticles. For the relithiation reaction, upon subsequent charge, we observe improved reversibility for the Sr-doped compared to non-doped and Ca-doped Fe2O3. We highlight that this combined technique approach is a reliable, facile and powerful tool to investigate electrode materials under realistic cycling condition. It provides an unbiased and holistic picture of the morphological and structural changes occurring during operation, which allows for adequate material tailoring.