歧化
法拉第效率
一氧化硅
离子
一氧化碳
阳极
无定形固体
化学工程
锂(药物)
硅
结晶度
方石英
化学
材料科学
冶金
复合材料
电极
有机化学
催化作用
物理化学
内分泌学
工程类
医学
石英
作者
Jing Li,Jianguang Guo,Qing Sun,Xiangkun Nie,Linna Dai,Yu Wang,Lijie Ci
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2021-09-27
卷期号:35 (19): 16202-16211
被引量:8
标识
DOI:10.1021/acs.energyfuels.1c02922
摘要
Silicon monoxide (SiO) has captured great attention as one of the most promising anode materials due to its great cycling stability as well as high theoretical capacity. However, hindered by its low initial Coulombic efficiency, the possible large-scale application remains an urgent issue. Herein, through a facile method, potassium ions are introduced into the disproportionation process of SiO to promote the transition from amorphous SiOx into the cristobalite phase with higher crystallinity. The cristobalite phase exhibits lower reaction activity with lithium ions, which reduces the formation of lithium silicate. As a consequence, the cycling stability and the initial Coulombic efficiency (ICE) are improved. In addition, it is proved in our study that increasing the heating temperature is helpful to improve the ICE and cycling stability of SiO. This work provides a facile disproportionation method for the microstructure regulation of SiO, offering a possible avenue for the development of large-scale applications of the SiO anode.
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