Titanosilicate Derived SiO₂/TiO₂@C Nanosheets with Highly Distributed TiO₂ Nanoparticles in SiO₂ Matrix as Robust Lithium Ion Battery Anode

Abstract

Carbon-coated SiO 2 /TiO 2 (SiO 2 /TiO 2 @C) nanosheets consisting of TiO 2 nanoparticles uniformly embedded in SiO 2 matrix and a carbon-coating layer are fabricated by using acidified titanosilicate JDF-L1 nanosheets as template and precursor. SiO 2 /TiO 2 @C has unique structural features of sheetlike nanostructure, ultrafine TiO 2 nanoparticles distributed in SiO 2 matrix, and carbon coating, which can expedite ion diffusion and electron transfer and relieve volume expansion efficiently, and thus, the synergetic combination of these advantages significantly enhances its Li storage capability. As anode of lithium-ion batteries (LIBs), SiO 2 /TiO 2 @C nanosheets exhibit a high capacity of 998 mAh g −1 at 100 mA g −1 after 100 cycles. Moreover, an ultrahigh capacity of 410 mAh g −1 retains at 2000 mA g −1 after 400 cycles. A mixed reaction mechanism of capacitance and diffusioncontrolled intercalation is revealed by qualitative and quantitative analysis.

Microsphere‐Like SiO2/MXene Hybrid Material Enabling High Performance Anode for Lithium Ion Batteries

“…For application in the field of large‐scale energy storage like electric vehicles, it is necessary to improve the energy density and rate capability of current LIBs . However, the relatively low theoretical capacity of graphite anode (372 mA h g −1 ) and the safety concern of lithium deposition upon overcharge due to its low potential (≈0.05 V vs Li/Li + ) hinder the practical utilization of LIBs . Recently, silicon (Si)‐based and silica (SiO 2 )‐based anodes have received considerable attention as promising candidates to replace graphite because of their high specific capacity, moderate working potential, and abundant reserves .…”

Interfacial Reactions between Lithium and Grain Boundaries from Anatase TiO2–TUD-1 Electrodes in Lithium-Ion Batteries with Enhanced Capacity Retention

“…14 In another recent study, the preparation of titanosilicate-derived nanosheets consisting of highly dispersed anatase TiO 2 nanoparticles in a silica matrix gave rise to capacities of 998 mA h g −1 after 100 cycles at 100 mA g −1 . 8 In the later study, the highly distributed TiO 2 and SiO 2 components in this material proved effective in achieving the optimized distribution of grain boundaries and improving the diffusion of Li + ions further, resulting in the capacities reported above. 8 An approach that has not been studied to improve the stability in LIBs is to use bifunctional templating agents that induce the formation of mesoporous structures, while also aiding in the generation of active sites during and after synthesis.…”

“…8 In the later study, the highly distributed TiO 2 and SiO 2 components in this material proved effective in achieving the optimized distribution of grain boundaries and improving the diffusion of Li + ions further, resulting in the capacities reported above. 8 An approach that has not been studied to improve the stability in LIBs is to use bifunctional templating agents that induce the formation of mesoporous structures, while also aiding in the generation of active sites during and after synthesis. 15 This has been previously demonstrated in the synthesis of TiO 2 -containing TUD-1 (Technische Universiteit Delft) composites using triethanolamine (TEA) as a porogen in the synthesis of mesoporous silica for the photo-oxidation of propane.…”

“…The diffusion of lithium ions within the electrodes is indicated using the straight line in the low-frequency region and the impedance measured in this region is related to the angular frequency (ω) and the diffusion coefficient (D Li ) using the Warburg factor (σ) according to (2) with R as the gas constant, T the absolute temperature, A the surface area of the electrode, n the number of electrons transferred for the redox couple, and F the Faradaic constant (96 485.3329 C mol −1 ). 8 The relation between Re Z and ω −0.5 for both mp-TiO 2 and TiO 2 −TUD-1 electrodes are shown in Figure 11b with their corresponding Warburg factors. Under similar preparation conditions, the diffusion of lithium for both devices are related according to…”

Facile fluoride-mediated syntheses of layered (Al/Fe)-JDF-L1 materials featuring macromorphological square-sheet structures

“…hydrocarbon cracking, isomerisation, and alkylation, to special oxidation as commercially exemplified by olefin epoxidation. 1) More attractive is recently the subtle fabrication of high-capacity lithium ion battery anodes, 2) a conceptual development by using layered titanosilicatederived nanosheets as a template-like precursor.…”