Novel Construction of Heterostructured FeTiO₃/Fe_2.75Ti_0.25O₄ Mesoporous Nanodisks with Both High Capacity and Stable Cycling Life for Lithium-Ion Storage

Abstract

Iron titanium oxides with the advantages of intercalation and conversion mechanisms are the promising anodes for high-energy-density and high-power-density lithium-ion batteries (LIBs). Herein, high-capacity Fe2.75Ti0.25O4 is first utilized for LIBs and combined with stable FeTiO3 to construct mesoporous heterostructures via introducing a ferrous precursor on Ti-based metal–organic frameworks and subsequent annealing treatment to solve the problem of low electronic conductivity and agglomeration during cycling for iron titanium oxides. Positive advantages including the large specific surface area provided by numerous nanoparticles, moderate volume expansion resulting from the porous structure and TiO2 matrix, rich lattice defects, and distinguished electronic structures introduced by abundant phase boundaries are obtained to boost the kinetic properties in the FeTiO3/Fe2.75Ti0.25O4 composite. The Fe–Ti–O electrode displays a high capacity of 735 mA h g–1 at 0.1 A g–1 and long cycle life with a capacity retention of 94.3% after 600 cycles at 1 A g–1. Moreover, good electrochemical properties can also be verified in solid-sate batteries and Fe–Ti–O//LiFePO4 full batteries. Furthermore, ex situ X-ray diffraction combined with X-ray photoelectron spectroscopy is used to investigate the reaction mechanism of Fe–Ti–O during the charge/discharge processes.

Hierarchical Co@C-N synthesized by the confined pyrolysis of ionic liquid@metal–organic frameworks for the aerobic oxidation of alcohols

“…5–8 Alternatively, non-precious-metal-based catalysts (such as Co, Fe, Cu, Ni) have stimulated much interest because of their rich reserves, low cost, and high oxidation activities. 9–13 Particularly, Co, N-doped porous carbons (Co@C-N) have attracted considerable attention in heterogeneous catalysis owing to their wide availability and superior properties. 14…”

“…[5][6][7][8] Alternatively, non-precious-metal-based catalysts (such as Co, Fe, Cu, Ni) have stimulated much interest because of their rich reserves, low cost, and high oxidation activities. [9][10][11][12][13] Particularly, Co, N-doped porous carbons (Co@C-N) have attracted considerable attention in heterogeneous catalysis owing to their wide availability and superior properties. 14 To achieve highly effective metal-C-N materials, much effort has been devoted to the construction of strong metal-support interactions to immobilize metal nanoparticles and avoid undesired aggregation.…”

Engineering monodispersed 2 nm Sb2S3 particles embedded in a porphyrin-based MOF-derived mesoporous carbon network via an adsorption method to construct a high-performance sodium-ion battery anode

“…6b, the b -values of the peaks 1, 2, and 3 are 0.69, 0.89, and 0.79, respectively, indicating that the electrochemical behavior for sodium storage of the composite anode is mainly derived from a surface-controlled mechanism. In addition, the ratio of a diffusion-controlled contribution and a capacitance-controlled contribution at different scanning rates can be calculated from the following formula (4): 23,56–58 i ( v ) = k 1 v + k 2 v 1/2 …”

SnF2-Doped Cs4PbBr6 Glass Ceramic as a High-Performance Anode for Li-Ion Batteries

“…To prevent the volume change, two main methods were induced in this field: metal–organic frameworks and glass-based open networks. , Recent studies indicate that glass anodes containing transition metals could supply disordered topology networks for lithium storage. Their flexibility in composition, easy tuning of crystal content, and easy preparation have attracted much attention.…”

“…10 The initial discharge specific capacity of (72SnO•26P 2 O 5 ) + 48AlN achieved was 780 mAh g −1 and the irreversible capacity was decreased largely. In Ge-glass-based anodes, 4,11 V-glass-based anodes, 12 and Si-glass-based anodes, 13 the open network of the glasses also suppressed the volumetric variety. Especially, V 2 O 5 −TeO 2 (VT) show a disorder−order transformation in cycling; ordered nanodomains and the disordered matrix exert a synergetic effect to facilitate the ionic and electronic transport and to maintain structural stability against discharging/ charging.…”