Li₂TiO₃/Graphene and Li₂TiO₃/CNT Composites as Anodes for High Power Li–Ion Batteries

Abstract

Three‐dimensional composites Li2TiO3/graphene (LTO/Gr) and Li2TiO3/carbon nanotube (LTO/CNTs) were synthesized by solid‐state reaction for application as anode materials for lithium‐ion batteries. These composites are structurally characterized by X‐ray diffraction, Raman spectroscopy and high‐resolution transmission electron microscopy, while electrochemically tests are performed by cyclic voltammetry and chronopotentiometry. The synergetic effect of graphene and CNTs with LTO facilitate the network conduction leading to faster electron and Li+ ion transfer and improve cycling stability and rate capability of the anode. The LTO/Gr and LTO/CNTs composites exhibited an initial discharge capacity as high as 154 and 149 mAh g−1 at 1C rate, respectively and retained excellent cycling stability of 98% and 96% after 30 charge–discharge cycles.

Transport Properties of Nanostructured Li2TiO3 Anode Material Synthesized by Hydrothermal Method

“…The pellet was used for electrical studies. Cyclic voltammetry (CV), galvanostatic charge-discharge experiments were conducted to evaluate the specific discharge capacity of the electrode as reported elsewhere [54]. A conventional three-electrode glass cell (Pt/saturated Li 2 SO 4 aqueous solution/Li 2 TiO 3 ) was used with an Ag/AgCl reference electrodes.…”

“…The elemental analysis of the as-prepared Li 2 TiO 3 powders sintered at 800 • C for 2 h carried out by energy dispersive spectroscopy (EDS) gives the composition of 74.5 and 25.5% (accuracy of ±0.5%) of titanium and oxygen, respectively (see Figure 2 in Ref. [54]). The LTO samples have a white color, which indicates a stoichiometric composition, according to Hoshino et al [55] for products sintered in oxidizing conditions.…”

“…In previous works, we have investigated the electrochemical properties of pristine nano-LTO [53], and the improve performance of LTO/CNT and LTO/graphene composites [54]. The effect of nanosized Li 2 TiO 3 was evidenced by the excellent cyclability and the stable specific discharge capacity of 113, 143 and 150 mAh g −1 , respectively, retained over 30 charge-discharge cycles at 1C rate.…”

Finite Element Model and Size Dependent Stability Analysis of Boron Nitride and Silicon Carbide Nanowires/Nanotubes

“…Recently, with a rise in the popularity of renewable energy for transportation and electronics, studies about carbon nanotube usage for improving the durability, lifespan, and capacity of batteries have started to receive considerable attention [17][18][19][20][21][22][23][24][25][26][27][28]. Further, in the last decade, studies about the usage of CNT in one of the most e ective usage areas, gas sensors, have soared [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Electrospun TiO2 nanofiber electrodes for high performance supercapacitors

“…The radius of the semicircle at high to medium frequency determines the value of the charge transfer resistance (R ct ) at the solidelectrolyte interface. The inclined line in the low frequency region is originated from the lithium ion diffusion process called Warburg diffusion (Z w ) [65]. The impedance values of TNFs electrode is slightly increased from 17 Ω to 18 Ω after 5000 cycles infer that the electrochemical process in the electrode is diffusion controlled and highly reversible.…”