Facile fabrication of Si/Sb/Sb2O3/G@C composite electrodes for high-performance Li-ion batteries. (26th February 2020)

• Record Type: Journal Article
• Authors: Sun, Feiyuan; Feng, Hao; Gao, Shilun; Yang, Dandan; Yang, Huabin
• Is Part Of: New journal of chemistry. Volume 44:Number 10(2020)
• Page Start: 4122
• Page End: 4128
• Publication Date: 2020-02-26
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c9nj05852d
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Facile fabrication of high-performance Si/Sb/Sb2 O3 /G@C composite material via the ball milling and high temperature calcination process is reported. Abstract : A silicon/antimony/antimony oxide/graphite@amouphous carbon (Si/Sb/Sb2 O3 /G@C) composite material was prepared successfully via a simple ball milling and high temperature calcination process. Its structural characterization showed that Si and Sb/Sb2 O3 were dispersed into the graphite layer and coated with amorphous carbon. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results revealed that Sb2 O3 was partly reduced to Sb by carbon, which could improve its electronic conductivity. Besides, Si, Sb, Sb2 O3 and carbon have different lithiation/delithiation voltage plateaus, which can act as a mutually buffering matrix, thus improving its electrochemical performance. Due to the high specific capacity, good electronic conductivity and stable cycling performance benefited from the Si/Sb/Sb2 O3, Sb/G and G/C, respectively, as well as the mutually buffering matrix of all the active materials, the resulting composite electrode materials exhibit excellent electrochemical performance. The composite material exhibited good cycling performance (a stable reversible delithiation capacity of 567.8 mA h g −1 after 180 cycles), excellent rate capability (∼360 mA h g −1 and 280 mA h g −1 at current densities of 1000 mA g −1 and 2000 mA g −1, respectively) and decreased polarization resistance. This work demonstrates a facile and cost-effective approach to preparing composite materials with complementary advantages for use in high-performance Li-ion batteries.