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Role of Oxygen Deficiency and Microstructural Voids/Gaps in Nanostructures of Ca2Fe2O5 as an Anode Toward Next-Generation High-Performance Li-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-26 00:00:00 , DOI: 10.1021/acsaem.0c00578 Sandeep Kumar Sundriyal 1 , Yogesh Sharma 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-26 00:00:00 , DOI: 10.1021/acsaem.0c00578 Sandeep Kumar Sundriyal 1 , Yogesh Sharma 1
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Recently, naturally abundant, low-cost, and high-capacity iron-based metal oxides have attracted much attention as anodes for next-generation Li-ion batteries. However, their practical applications have been impeded by low electronic/ionic conductivity and a poor cycle life resultant of their drastic volume expansion/shrinkage during cycling. Herein, two nanostructures (nanoparticles and nanofibers) of Ca2Fe2O5 (C2FO) are fabricated and well characterized by FE-SEM, TGA, XRD, XPS, HR-TEM, and EPR. Nanofibers of C2FO exhibit almost two-times higher capacity than the presently employed commercial graphite. Further, excellent cyclability (up to 250 cycles) and rate capability are demonstrated by C2FO nanofibers. On the other hand, nanoparticles of C2FO are found to be inferior to the nanofibers of C2FO. XPS and EPR techniques reveal a greater presence of oxygen vacancies in the C2FO nanofibers, which improve the electronic/ionic conductivity of C2FO. In this study, we have shown that it is not only a good matrix element such as CaO but also a unique morphology as well as a high concentration of oxygen vacancies that is essential to get a high and stable capacity in cheap, green, and abundant Fe-based electrode materials. Furthermore, the viability of Ca2Fe2O5 nanofibers is also tested in full cell configuration with a LiCoO2 cathode.
中文翻译：
缺氧和微结构空隙/间隙在Ca 2 Fe 2 O 5纳米结构中作为下一代高性能锂离子电池阳极的作用
近来，作为下一代锂离子电池的负极，天然丰富，低成本和高容量的铁基金属氧化物引起了广泛关注。然而，由于其在循环期间的急剧的体积膨胀/收缩，低的电子/离子电导率和差的循环寿命阻碍了它们的实际应用。在此，制造了Ca 2 Fe 2 O 5（C2FO）的两个纳米结构（纳米颗粒和纳米纤维），并通过FE-SEM，TGA，XRD，XPS，HR-TEM和EPR对其进行了很好的表征。C2FO纳米纤维的容量几乎是目前使用的商用石墨的两倍。此外，C2FO纳米纤维证明了出色的循环能力（最多250个循环）和速率能力。另一方面，发现C2FO的纳米粒子劣于C2FO的纳米纤维。XPS和EPR技术显示C2FO纳米纤维中氧空位的存在更大，从而改善了C2FO的电子/离子电导率。在这项研究中，我们已经表明，不仅CaO这样的基质元素很好，而且独特的形态以及高浓度的氧空位对于在廉价，绿色和丰富的环境下获得高而稳定的容量至关重要。铁基电极材料。此外，还使用LiCoO 2阴极以全电池配置测试了Ca 2 Fe 2 O 5纳米纤维的生存能力。
更新日期：2020-06-26
中文翻译：
缺氧和微结构空隙/间隙在Ca 2 Fe 2 O 5纳米结构中作为下一代高性能锂离子电池阳极的作用
近来，作为下一代锂离子电池的负极，天然丰富，低成本和高容量的铁基金属氧化物引起了广泛关注。然而，由于其在循环期间的急剧的体积膨胀/收缩，低的电子/离子电导率和差的循环寿命阻碍了它们的实际应用。在此，制造了Ca 2 Fe 2 O 5（C2FO）的两个纳米结构（纳米颗粒和纳米纤维），并通过FE-SEM，TGA，XRD，XPS，HR-TEM和EPR对其进行了很好的表征。C2FO纳米纤维的容量几乎是目前使用的商用石墨的两倍。此外，C2FO纳米纤维证明了出色的循环能力（最多250个循环）和速率能力。另一方面，发现C2FO的纳米粒子劣于C2FO的纳米纤维。XPS和EPR技术显示C2FO纳米纤维中氧空位的存在更大，从而改善了C2FO的电子/离子电导率。在这项研究中，我们已经表明，不仅CaO这样的基质元素很好，而且独特的形态以及高浓度的氧空位对于在廉价，绿色和丰富的环境下获得高而稳定的容量至关重要。铁基电极材料。此外，还使用LiCoO 2阴极以全电池配置测试了Ca 2 Fe 2 O 5纳米纤维的生存能力。
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