Titanium niobium oxides (TiNb2O7): Design, fabrication and application in energy storage devices

High-pressure bandgap engineering and amorphization in TiNb2O7 single crystals

“…9 Similar to TiTa 2 O 7 , the structure of TiNb 2 O 7 can also be described as a “3 × 3 shear ReO 3 ”. 10 In such a structure, Ti 4+ and Nb 5+ cations occupy the centre of MO 6 (M = Ti, Nb) octahedra randomly. These octahedra are connected by corner- and edge-sharing bridge oxygen atoms, and along the b -axis, they form linear columns which are connected by face-sharing.…”

Ternary Deep Eutectic Solvent (DES) with a Regulated Rate-Determining Step for Efficient Recycling of Lithium Cobalt Oxide

“…The massive production and upgrading of electronic devices and electric vehicles have led to the rapid growth for the production of rechargeable lithium ion batteries (LIBs), − which will translate to tremendous amounts of waste in the coming years. − Direct disposal of LIBs through landfilling or burning would cause severe environmental pollution and resource wasting, , thus calling for the development of an efficient, economical, safe, and green recycling strategy of LIBs. − Among various components in LIBs, most efforts to improve recycling have focused on the extraction of valuable metal elements from cathodes, especially cobalt for its high value and environmental consideration. ,− Currently, pyrometallurgy or mixed pyro- and hydrometallury is the dominating approach used in industry (companies including Accure GmbH, Sony. Umicore, etc.…”

Effect of Mechanical Activation and Carbon Coating on Electrochemistry of TiNb2O7 Anodes for Lithium-Ion Batteries

“…Recently, Nb-based oxides with Wadsley-Roth crystallographic shear structures have been intensively studied as high-rate anode materials with increased specific capacity for LIBs [5][6][7][8][9]. Their unique stable shear ReO 3 -type crystal structure and the possibility of implementing multielectron redox processes give hope for the development of nextgeneration of LIBs characterized by high energy density and long cycle life [9].…”

“…Its average insertion voltage is about 1.64 V vs. Li + /Li at 0.1 C, which is close to that of 1.55 V for Li 4 Ti 5 O 12 . However, pure TiNb 2 O 7 has the same drawbacks as Li 4 Ti 5 O 12 : it is an oxide with a wide band gap and therefore has poor electronic conductivity (10 −9 -10 −11 S cm −1 ), which can be increased by the introduction of oxygen vacancies, doping, and conductive coating [5,8,9].…”

“…Usually, cost-effective and simple solid-state synthesis is used as the most suitable way to produce TiNb 2 O 7 . However, this method requires heat treatment of a reagent mixture of TiO 2 and Nb 2 O 5 at a high temperature of 1000-1400 • C for 12-24 h and usually results in the formation of a heterogeneous product with micron-sized agglomerated particles and wide particle size distribution [5,8]. There have been several reports in which the authors tried to reduce the temperature and synthesis time.…”