Watermelon‐Like Structured SiOx–TiO2@C Nanocomposite as a High‐Performance Lithium‐Ion Battery Anode. (4th June 2018)

• Record Type: Journal Article
• Authors: Li, Zhaolin; Zhao, Hailei; Lv, Pengpeng; Zhang, Zijia; Zhang, Yang; Du, Zhihong; Teng, Yongqiang; Zhao, Lina; Zhu, Zhiming
• Is Part Of: Advanced functional materials. Volume 28:Number 31(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-04
• Subjects: anodes -- electrochemical properties -- lithium‐ion batteries -- silicon suboxide -- titanium oxide; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201605711
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: A unique watermelon‐like structured SiO x –TiO2 @C nanocomposite is synthesized by a scalable sol–gel method combined with carbon coating process. Ultrafine TiO2 nanocrystals are uniformly embedded inside SiO x particles, forming SiO x –TiO2 dual‐phase cores, which are coated with outer carbon shells. The incorporation of TiO2 component can effectively enhance the electronic and lithium ionic conductivities inside the SiO x particles, release the structure stress caused by alloying/dealloying of Si component and maximize the capacity utilization by modifying the Si–O bond feature and decreasing the O/Si ratio ( x ‐value). The synergetic combination of these advantages enables the synthesized SiO x –TiO2 @C nanocomposite to have excellent electrochemical performances, including high specific capacity, excellent rate capability, and stable long‐term cycleability. A stable specific capacity of ≈910 mAh g −1 is achieved after 200 cycles at the current density of 0.1 A g −1 and ≈700 mAh g −1 at 1 A g −1 for over 600 cycles. These results suggest a great promise of the proposed particle architecture, which may have potential applications in the improvement of various energy storage materials. Abstract : Watermelon‐like structured SiO x –TiO2 @C nanocomposite with hybrid SiO x –TiO2 core and carbon shell is prepared as anode material for lithium‐ion batteries . The incorporation of TiO2 enhances not only the transport of both lithium ions and electrons, but also the capacity utilization of SiO x . The prepared SiO x –TiO2 @C electrode material shows high specific capacity, excellent rate capability, and outstanding cycling stability.