Facile Construction of Hierarchical TiNb2O7/rGO Nanoflower With Robust Charge Storage Properties for Li Ion Batteries via an Esterification Reaction

Abstract

TiNb2O7 (TNO) compound has been pursued tremendously due to its high theoretical capacity, high potential, and excellent cycle stability. Unfortunately, an intrinsic low electronic and ionic conductivity feature has restricted its broad applications in electrochemical energy storage fields. Two-dimensional (2D) nanostructures can effectively shorten Li-ion transport path and enhance charge transfer. Here, hierarchical structure TNO was constructed by using ethanol and acetic acid as particularly important organic chemicals of basic raw materials via a simple solvothermal reaction. Ethanol was found to play a critical role in the formation of 2D sheet structure. Meantime, reduced graphene oxide nanosheets can effectively improve electronic conductivity. As-obtained TiNb2O7 were wrapped further by graphene oxide nanosheets through a flocculation process. Their unique structure is beneficial to the final electrochemical performance. This study not only provides a general approach for the design of novel 2D nanomaterials wrapped by graphene because of the advantage of esterification reaction and flocculation reaction, but also improves the electronic and ionic conductivity simultaneously.

Hydrophobic dispersion-derived Si/rGO nanocomposites in SiOC ceramic matrix as anode materials for high performance lithium-ion batteries

“…This result indicates that rGO material in the Si/rGO/SiOC electrode provides more contribution to the surface-related reaction, as compared to that in the Si/SiOC electrode. 60 Additionally, as the scan rate increased, the uniform distribution of nanoparticles significantly affected the capacitive behavior of the electrode owing to the inevitable polarization in the semi-infinite diffusion reaction. 61 Moreover, rGO has a large specific surface area so that Li + can be effectively adsorbed and stored, suggesting the improvement of surface-related capacitive reactions and excellent electrochemical performance.…”

Ultrathin Carbon-Coated Porous TiNb2O7 Nanosheets as Anode Materials for Enhanced Lithium Storage

“…To boost the electrochemical performance of TNO, researchers have adopted a variety of methods [ 13 , 14 , 15 , 16 , 17 , 18 ]. The first strategy is to construct a nanoscale structure to shorten the transmission path of Li + , especially for building two-dimensional porous nanostructures [ 19 , 20 , 21 , 22 , 23 , 24 ], which can further offer higher specific surface area, more active sites, as well as relieve volume change, thus realizing superior electrochemical performance.…”