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Watermelon‐Like Structured SiO x –TiO 2 @C Nanocomposite as a High‐Performance Lithium‐Ion Battery Anode
Author(s) -
Li Zhaolin,
Zhao Hailei,
Lv Pengpeng,
Zhang Zijia,
Zhang Yang,
Du Zhihong,
Teng Yongqiang,
Zhao Lina,
Zhu Zhiming
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201605711
Subject(s) - materials science , nanocomposite , anode , lithium (medication) , chemical engineering , carbon fibers , coating , electrochemistry , phase (matter) , lithium ion battery , nanoparticle , particle (ecology) , battery (electricity) , nanotechnology , composite material , composite number , electrode , organic chemistry , medicine , power (physics) , chemistry , physics , oceanography , quantum mechanics , endocrinology , geology , engineering
A unique watermelon‐like structured SiO x –TiO 2 @C nanocomposite is synthesized by a scalable sol–gel method combined with carbon coating process. Ultrafine TiO 2 nanocrystals are uniformly embedded inside SiO x particles, forming SiO x –TiO 2 dual‐phase cores, which are coated with outer carbon shells. The incorporation of TiO 2 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 –TiO 2 @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.