Well-Dispersed Fe Nanoclusters for Effectively Increasing the Initial Coulombic Efficiency of the SiO Anode,ACS Nano

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Well-Dispersed Fe Nanoclusters for Effectively Increasing the Initial Coulombic Efficiency of the SiO Anode
ACS Nano ( IF 15.8 ) Pub Date : 2023-04-06 , DOI: 10.1021/acsnano.3c00709
Zhao Yang ₁ , Zhaolin Li _{1,

2} , Yaozong Yang ₁ , Qian Zhang ₁ , Hongliang Xie ₁ , Jie Wang _{1,

2} , Konrad Świerczek ₃ , Hailei Zhao _{1,

2}

Affiliation

An efficient surface modification strategy is proposed to significantly increase the initial Coulombic efficiency (ICE) of SiO anode material. The SiO@Fe material with the Fe nanocluster homogeneously decorating on the SiO surface is successfully prepared by a chemical vapor deposition process. The well-dispersed Fe nanoclusters realize an Ohmic contact with lithium silicates, the commonly regarded irreversible lithiation product, which effectively lowers the electron conduction barriers and promotes the concomitant lithium-ion release of the lithium silicates upon the delithiation process, increasing the ICE of the SiO anode. The prepared SiO@Fe exhibits a much higher ICE of 87.2% compared to 64.4% of pristine SiO, with the largest increment (23%) never reported, except for the prelithiation, and delivers significantly enhanced cycling and rate performance. These findings provide an effective way to convert the “inert” phase to “active” which essentially increases the ICE of the electrode.

中文翻译：

均匀分散的 Fe 纳米团簇可有效提高 SiO 阳极的初始库仑效率

提出了一种有效的表面改性策略，以显着提高 SiO 负极材料的初始库仑效率 (ICE)。通过化学气相沉积工艺成功制备了在 SiO 表面均匀装饰 Fe 纳米团簇的 SiO@Fe 材料。分散良好的 Fe 纳米团簇实现了与硅酸锂的欧姆接触，硅酸锂是通常被认为是不可逆的锂化产物，这有效地降低了电子传导势垒，并促进了硅酸锂在脱锂过程中伴随的锂离子释放，提高了锂的 ICE二氧化硅阳极。与原始 SiO 的 64.4% 相比，制备的 SiO@Fe 表现出更高的 87.2% ICE，除了预锂化外，从未报道过最大增量 (23%)，并提供显着增强的循环和倍率性能。这些发现提供了一种将“惰性”相转化为“活性”相的有效方法，这从根本上增加了电极的 ICE。

更新日期：2023-04-06

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