Hierarchical Li4Ti5O12/TiO2 composite tubes with regular structural imperfection for lithium ion storage

Abstract

Hierarchical Li4Ti5O12/TiO2 tubes composed of ultrathin nanoflakes have been successfully fabricated via the calcination of the hydrothermal product of a porous amorphous TiO2 precursor and lithium hydroxide monohydrate. The hierarchical tubes are characterized by powder X-ray diffraction, nitrogen adsorption/desorption, scanning electron microscopy and transmission electron microscopy techniques. These nanoflakes exhibit a quite complex submicroscopic structure with regular structural imperfection, including a huge number of grain boundaries and dislocations. The lithium ion storage property of these tubes is evaluated by galvanostatic discharge/charge experiment. The product shows initial discharge capacities of 420, 225, and 160 mAh g−1 at 0.01, 0.1, and 1.0 A g−1, respectively. After 100 cycles, the discharge capacity is 139 mAh g−1 at 1.0 A g−1 with a capacity retention of 87%, demonstrating good high-rate performance and good cycleability. The high electrochemical performance is attributed to unique structure and morphology of the tubes. The regular structural imperfection existed in the nanoflakes also benefit to lithium ion storage property of these tubes. The hierarchical Li4Ti5O12/TiO2 tubes are a promising anode material for lithium-ion batteries with high power and energy densities.

Control over large-volume changes of lithium battery anodes via active–inactive metal alloy embedded in porous carbon

“…It is worth noting that mixed phase has multiple advantages over pure phase likewise, high grain boundary Scheme 1 Schematic illustration of synthesis method for CoSn x @C-PAn via in-situ polymerization and annealing processes; further presenting the mechanism of lithium storage in the hybrid. densities enhance the interfacial Li + storage through space layer charge and thus offer large capacity and provide channels for faster transport of Li + in the NPs [34,35]. XRD pattern of CoSn x @C-PAn also shows two diffraction peaks at 26.61 and 51.71, attributed to (110) and (211) reflections of SnO 2 , respectively (JCPDS no.…”

Electrochemical Characteristics and Li+ Ion Intercalation Kinetics of Dual-Phase Li4Ti5O12/Li2TiO3 Composite in the Voltage Range 0–3 V

“…In last five years, many groups have studied composites of Li 4 Ti 5 O 2 with metal oxides to explore high rate capability with rich grain boundaries enabling fast diffusion of ions into the active material. [27][28][29][30][31][32][33] In this regard, Li 4 Figure S1). Sintering the sample for 2 hours resulted into pure Li 4 prepared by grinding and sonicating 80 wt % of the sample to be examined, 10 wt % acetylene black and 10 wt % polyvinylidene flouride (PVDF) binder in N-methyl-pyrrolidinone solvent.…”

Enhanced electrochemical performance of carbon-coated TiO2 nanobarbed fibers as anode material for lithium-ion batteries

“…Several research results have been reported on hyperbranch designs developed to increase the specific surface area of metal oxide nanostructures [13][14][15][16][17]. However, the volume change occurring during the lithiationdelithiation process may still break the electrical contact pathways in metal oxide electrodes.…”