TiNb ₂ O ₇ microsphere anchored by polydopamine‐modified graphene oxide as a superior anode material in lithium‐ion batteries

Abstract

Summary TiNb2O7 (TNO) is considered a promising anode material for lithium‐ion batteries. High contact and homogeneity of the composite fabricated by TNO powder and conductive materials with different density are significant to improve the poor electric conductivity of TNO microspheres. In this study, we introduce graphene oxide (GO) to synthesize a composite material with TNO microspheres. Moreover, a polydopamine (PDA) coating technique is applied to achieve uniform distribution and high contact between TNO and GO materials. The ‐OH catechol groups in the PDA have a strong adhesion ability to inorganic surfaces. After a simple sonication process, the hybrid material is well‐fabricated, where TNO microspheres are attached along the surface of the PDA‐coated GO (PGO). The TNO/PGO composite shows remarkably enhanced performances such as cycling stability (202.7 mAh g−1 over 300 cycles at 1C) and rate capability (136.5 mAh g−1 over 1000 cycles at 5C). The formation of a high conductive network among TNO microspheres mainly enhances those electrochemical performances, and the PDA layer is a key factor in obtaining a homogeneous GO composite through its high adhesive ability and hydrophilicity.

Electrochemical performance of Mn 3 O 4 nanorods by N‐doped reduced graphene oxide using ultrasonic spray pyrolysis for lithium storage

“…More notably, the reversible capacity of Mn‐NrGO slowly increased to approximately 1400 mAh/g after 100 cycles, higher than the theoretical capacity (936 mAh/g) of Mn 3 O 4 . It has been known that the extraordinary capacity of many metal oxide based anode materials might be attributed to following three reasons: (a) the formation/decomposition of polymer gel‐like films on the electrode, (b) further oxidation of manganese oxide during repeated lithiation/delithiation cycles, and (c) a lower electromotive force value for lithium storage, which arises from the interfacial charge process 3,12,19,27,60‐64 . Herein, we suggest that this higher specific capacity value corresponded to the synergistic effect of nitrogen doped reduced graphene oxide and 1D Mn 3 O 4 nanorods.…”

“…It has been known that the extraordinary capacity of many metal oxide based anode materials might be attributed to following three reasons: (a) the formation/decomposition of polymer gel-like films on the electrode, (b) further oxidation of manganese oxide during repeated lithiation/delithiation cycles, and (c) a lower electromotive force value for lithium storage, which arises from the interfacial charge process. 3,12,19,27,[60][61][62][63][64] Herein, we suggest that this higher specific capacity value corresponded to the synergistic effect of nitrogen doped reduced graphene oxide and 1D Mn 3 O 4 nanorods. The higher nitrogen content such as pyridinic and pyrolic catalyze the electrical conductivity and degree of disorderness (I D /I G ) in Mn-NrGO composite and efficiently improved the Li + ion diffusion.…”

Recent Advances in Titanium Niobium Oxide Anodes for High-Power Lithium-Ion Batteries

“…Materials combined with TNO can be divided into carbon, metal, or semiconductor material composites, ,,, Ti/Nb oxide self-dopants to improve the ionic conductivity, materials with strong mechanical stability to stabilize the structure change during the Li + insertion/extraction process, and other anodic materials with high capacities to increase the lithiation capacities . Combining two or more materials with TNO is a promising strategy to improve the electrochemical performance of TNO. ,,, …”

“…Copyright 2018, Elsevier). (4) TiNb 2 O 7 /polydopamine-GO (Reprinted with permission from ref . Copyright 2020 Wiley).…”

Controlled nanostructure of a graphene nanosheet‐TiO 2 composite fabricated via mediation of organic ligands for high‐performance Li storage applications

“…Specifically, the lattice/crystalline structure, morphology, and porosity of TiO 2 ‐based electrodes have been modified to promote their reaction kinetics and the Li + transport by increasing the number of open channels and active sites 2,3,8‐14 . In addition, several studies have attempted to enhance the electronic conductivity of TiO 2 ‐based anodes by hybridizing TiO 2 with conductive materials, such as carbon nanotubes, graphene, and porous carbon, or by doping through various processes 2,3,10,15,16 …”