期刊
APPLIED SURFACE SCIENCE
卷 515, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.146026
关键词
Crystallinity; SiOx coating; Si@SiOx particles; Lithium-ion batteries
类别
资金
- China Postdoctoral Science Foundation [2016M592115]
- Jiangxi Postdoctoral Foundation [2015KY12]
- National Natural Science Foundation of China [11964018]
- Natural Science Foundation of Jiangxi Province of China [20181BAB202027]
In this work, SiOx coatings with different crystallinity are successfully prepared on the surface of the silicon (Si) particles by dry oxidation and we oxidation. The SiOx coatings formed by low-temperature dry oxidation are not only continuous and uniform, but also have the low crystallinity. Theoretically, the continuous, uniform and low-crystallinity SiOx coating is more advantageous for lithium-ion transport and structural stability during the alloying/de-alloying. As a result, the 550 degrees C sample shows the best electrochemical performance. For example, the 550 degrees C sample has the highest specific discharge capacity a 2C than other samples. As the rate is restored to 0.1 C, the 550 degrees C sample also exhibits faster recovery of capacity. Besides, the discharge specific capacity of the 550 degrees C sample is up to 1108 mAh g(-1) after 100 cycles a 0.5 C, showing the best cycle stability.
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