Ultrathin Anatase TiO₂ Nanosheets Embedded with TiO₂‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries

Abstract

A new form of TiO2 microspheres comprised of anatase/TiO2‐B ultrathin composite nanosheets has been synthesized successfully and used as Li‐ion storage electrode material. By comparison between samples obtained with different annealing temperatures, it is demonstrated that the anatase/TiO2‐B coherent interfaces may contribute additional lithium storage venues due to a favorable charge separation at the boundary between the two phases. The as‐prepared hierarchical nanostructures show capacities of 180 and 110 mAh g−1 after 1000 cycles at current densities of 3400 and 8500 mA g−1. The ultrathin nanosheet structure which provides short lithium diffusion length and high electrode/electrolyte contact area also accounts for the high capacity and long‐cycle stability.

Titanium dioxide nanotrees for high-capacity lithium-ion microbatteries

“…Recently, anatase 2D nanosheet branches were fabricated via solvothermal reactions. 32,33 In the anatase/TiO 2 (B) composites, anatase acts as electronaccepting phase and TiO 2 (B) accommodates the Li + ions, resulting in an effective charge separation at the interface and thus the enhanced lithium storage. Moreover, it still remains a great challenge to construct 2D TiO 2 nanobranches with ultrathin thickness (below 10 nm) and large length (above 200 nm) on vertically aligned 1D TiO 2 nanoarrays, especially through a facile route without the need of high temperature/high pressure.…”

“…29,30 Although some TiO 2 nanotrees were prepared and used in photocatalysis, 24 photoelectrochemical water splitting 22,23 and dye sensitized solar cell, 21,25-30 their electrochemical performances as anode for LIBs remain unexplored, to the best of our knowledge. [32][33][34] Herein, TiO 2 nanotrees were fabricated for lithium ion microbatteries by depositing anatase/TiO 2 (B) mixed phase nanobelts onto single-crystalline anatase nanowire arrays via a facile synthetic route without any surfactant or seed layer, for the first time. Recently, we developed a facile strategy to synthesize TiO 2 ultrathin nanobelt powders.…”

Fabrication of core–shell porous nanocubic Mn2O3@TiO2as a high-performance anode for lithium ion batteries

“…[15][16][17] Inert compounds such as ZnO, AlF 3 , ZrO 2 are often used for coating, which cause the capacity loss of oxide cathodes. [22][23][24] In this work, we proposed a novel composite of Mn 2 O 3 and anatase TiO 2 nanoparticles, core-shell porous cubic Mn 2 O 3 @TiO 2 , as anode of lithium ion battery. [18][19][20][21] Anatase TiO 2 has a theoretical capacity of 167.5 mAh g -1 with a relatively wide potential plateau and its tetragonal crystal structure provides paths for fast transportation of lithium ions.…”

Amorphous Vanadium Titanates as a Negative Electrode for Lithium-ion Batteries

“…The morphology of aVTO powder is advantageous in high-power applications because it provides a short Li + diffusion path and a larger contact area with the electrolyte solution [13][14][15][16][17]. Fig.…”

“…It is intuitive that phase transitions can be suppressed by introducing disorder, for instance, structural defects such as vacancies and void spaces on the surface of nanostructured materials or in the bulk of amorphous materials [12]. Moreover, nanostructuring of electrode materials is expected to be a promising strategy to increase the power density of cells by shortening the Li + diffusion path within the bulk materials [13][14][15][16][17]. In addition to suppressing unwanted phase transitions, amorphization of electrode materials has also been proven effective for increasing the number of Li + storage sites and facilitating solid-state Li + diffusion through the abundant void spaces [18][19][20][21].…”