Hierarchical C/SiO _x /TiO₂ ultrathin nanobelts as anode materials for advanced lithium ion batteries

Abstract

TiO-based nanomaterials are demonstrated to be a promising candidate for next generation lithium ion batteries due to their stable performance and easy preparation. However, their inherent low capacity impedes their wide application compared to commercial carbon nanomaterials. Here we present a unique in situ grafting-graphitization method to achieve a ternary nanocomposite of C/SiO /TiO ultrathin nanobelts with a core-shell heterostructure. The obtained ternary nanocomposite integrates the merits of high specific capacity of SiO , the excellent mechanical stability of graphite-like carbon and the high reactivity of TiO. Cyclic voltammetric curves and cycling performance manifest the optimal ternary nanocomposite and deliver a very high initial specific capacity of ∼1196 mA h g with both good rate capability (∼200 mA h g up to 10 C) and especially enhanced cycle stability. Our work demonstrates that building hierarchical core-shell heterostructures is an effective strategy to improve capacity and cycling performance in other composite anodes for electrochemical energy storage materials.

SiOx‐Modified Biocarbon Materials Derived from Shaddock Peel for Li–Ion Batteries

“…It can be concluded that no elemental Si is included in the composites. As shown in Figure c, the strong peak in C 1s signal of C‐SiO x ‐2 at 284.8 eV is dominated by the C=C bond, which is mainly assigned to graphitic carbon . Two peaks at 285.7 eV and 288.7 eV are originated from C–O–Si and C=O, respectively.…”

“…However, the practical application of Si anode is hindered by the low intrinsic electric conductivity and severe volume changes during Li insertion/extraction. Tremendous efforts have been made to overcome these problems by reducing the particle size, preparing silicon‐based alloys, and coating with carbon . As comparison, SiO x materials are more attractive because the Li 2 O generated by the reaction of Li with SiO x can act as a buffer to release the volume stress .…”

“…As comparison, SiO x materials are more attractive because the Li 2 O generated by the reaction of Li with SiO x can act as a buffer to release the volume stress . In our previous work, we prepared a ternary nanocomposite of C/SiO x /TiO 2 ultrathin nanobelts with a core‐shell heterostructure . A small amount of SiO x can increase the initial specific capacity and cycling performance of C/SiO x /TiO 2 composites remarkably.…”

“…Tremendous efforts have been made to overcome these problems by reducing the particle size, preparing silicon-based alloys, and coating with carbon. [18,19] As comparison, SiO x materials are more attractive because the Li 2 O generated by the reaction of Li with SiO x can act as a buffer to release the volume stress. [20][21][22][23][24][25] In our previous work, we prepared a ternary nanocomposite of C/SiO x /TiO 2 ultrathin nanobelts with a core-shell heterostructure.…”

Novel Sepiolite‐Based Materials for Lithium‐ and Sodium‐Ion Storage

“…Indeed, after the commercialization of the LIBs, many efforts have been devoted to explore new anode materials. A variety of carbon and noncarbon materials such as graphene, carbon nanotubes (CNTs), carbon nanofibers, silicon‐based composites, germanium, tin and transition metal oxides (TMOs), have been widely investigated. However, the poor electron transfer, high volume expansion, and fast capacity decay are the main limitations that have to be overcome before the successful use.…”