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多层SiO来源于Si-Ca合金通过Fe₂O₃氧化用于离子电池

Hanqing Dong¹, Hongwei Xie¹, Qiushi Song¹

¹Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Minbistry of Education, School of Metallurgy, Northeastern University, Shenyang, 110819, PR China. xiehw@smm.neu.edu.cn.

Dalton transactions (Cambridge, England : 2003)

|February 20, 2025

概括

二维氧化 (SiO2) 显示为离子电池的前景. 一种新的脱皮方法创造了多层SiO2,增强了离子通路和容量保留,以提高电池性能.

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
纳米技术纳米技术

背景情况:

氧化 (SiO2) 是离子电池的一个有希望的阳极材料,因为它具有很高的特定容量.
低速率性能和体积扩张问题阻碍了SiO2的实际应用.
目前正在研究二维SiO2结构,通过缩短离子扩散路径和适应体积变化来克服这些限制.

研究的目的:

为二维多层氧化 (ML-SiO2) 开发一种新的合成方法.
为了提高SiO2作为离子电池的阳极材料的电化学性能.
调查ML-SiO2对提高容量和速度性能的结构性益处.

主要方法:

一种使用酸 (CaSi2) 和铁 (III) 氧化物 (Fe2O3) 合成多层SiO2.2的固体脱皮方法.
使用盐酸 (HCl) 去除副产品,以创建较大的层间隔.
合成的ML-SiO2-Fe2O3作为离子电池阳极的电化学特征.

主要成果:

合成的ML-SiO2表现出很大的层间隔和空隙,适应体积膨胀并防止粉碎.
薄层ML-SiO2缩短了离子 (Li+) 路径,提高了速度性能.
在200个循环后,ML-SiO2-Fe2O3在0.5A g-1下达到697.8mA hg-1的可逆容量,保留率为94.2%.
在3A g-1时观察到432.7mA hg-1的优异速率性能,在0.1A g-1时恢复到1157.1mA hg-1.

结论:

固体脱皮方法有效地产生了具有增强结构性质的多层SiO2.
由此产生的ML-SiO2-Fe2O3表现出优越的电化学性能,解决了传统SiO2阳极的关键局限性.
这项工作为合成高性能离子电池的先进SiO2材料提供了新的途径.

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