Electrochemical performances and gassing behavior of high surface area titanium niobium oxides

Abstract

A solvothermal synthesis is developed to build a 3D network of nanoparticles, enhancing the electrochemical performances of both TiNb 2 O 7 and Ti 2 Nb 10 O 29 , especially at high current densities, with up to 190 mAh g -1 at 10C. A set of 11 mAh pouch cells combining the nanosized TiNb 2 O 7 with LiMn 1.5 Ni 0.5 O 4 is tested and is the first to be reported for this material. Soft shell cells are used, not only to evaluate the electrochemical performances of this oxide in a larger scale battery, but also to assess its gassing behavior, a well-known limitation for application of Li 4 Ti 5 O 12 in hybrid electric vehicles. In order to evaluate the sole contribution of TiNb 2 O 7 to the swelling, an additional set of soft shell TiNb 2 O 7 /Li(Ni 1/3 Mn 1/3 Co 1/3 )O 2 cells is assembled and stored at 45 ºC in a charged state. A higher swelling behavior is observed for TiNb 2 O 7 in comparison to Li 4 Ti 5 O 12 ; a clear trend also appears between surface area of the oxide and amount of gassing. The swelling of TiNb 2 O 7 or Ti 2 Nb

Mg2Nb34O87 Porous Microspheres for Use in High-Energy, Safe, Fast-Charging, and Stable Lithium-Ion Batteries

“…It should be emphasized that the superior rate capability of Mg 2 Nb 34 O 87 -P is one of the best results in the research community of the M–Nb–O anode materials (Table S4). − Additionally, at 10C, Mg 2 Nb 34 O 87 -P presents excellent cycling stability, with up to 93.1% capacity retention after 500 cycles. This percentage is very close to that of Mg 2 Nb 34 O 87 -M (93.5%) (Figure e).…”

“…At a small current rate of 0.1C, Mg 2 Nb 34 O 87 -M displays a high Coulombic efficiency of 89.3% and a high reversible capacity of 290 mAh g –1 in the first cycle, whereas Mg 2 Nb 34 O 87 -P exhibits huge values of 94.8% and 338 mAh g –1 , surpassing those of the investigated graphite and M–Nb–O anode materials. − The reason for the high initial Coulombic efficiencies can be that little SEI layers form during the electrochemical reaction of Mg 2 Nb 34 O 87 . With increasing current rate, Mg 2 Nb 34 O 87 -M retains high capacities of 253, 228, 205, 179, and 149 mAh g –1 , respectively, at 0.5, 1, 2, 5, and 10C (Figure b–d).…”

“…In recent years, intercalation-type M–Nb–O anode materials, such as TiNb 2 O 7 , − Ti 2 Nb 10 O 29 , − TiNb 24 O 62 , FeNb 11 O 29 , − GaNb 11 O 29 , Cr 0.5 Nb 24.5 O 62 , and ZrNb 24 O 62 , have gained extensive attention due to their high specific capacities, safe operating potentials, high cycling stability, and significant intercalation pseudocapacitive behavior. The M–Nb–O materials contain rich redox chemistry of Nb 4+ /Nb 5+ and Nb 3+ /Nb 4+ (Ti 3+ /Ti 4+ , Nb 4+ /Nb 5+ , and Nb 3+ /Nb 4+ for Ti–Nb–O), resulting in their high theoretical capacities of 379–403 mAh g –1 , ,,,− which are at least twice that of Li 4 Ti 5 O 12 and even surpass that of graphite.…”

Fast Charging Anode Materials for Lithium‐Ion Batteries: Current Status and Perspectives

“…Although niobium‐based oxide has made significant progress as fast charging anode materials for lithium‐ion batteries, it still suffers from problems such as high cost, gas evolution at the electrode/electrolyte surface due to the reductive decomposition of the electrolyte, [ 205 ] which limits its further commercialization.…”

High-rate lithium ion energy storage to facilitate increased penetration of photovoltaic systems in electricity grids

“…Furthermore, the less-passivated surfaces of the high potential anodes can give rise to challenges, such as gas generation and pressure buildup in the cell. [156][157][158] Another option is to engineer an artificial SEI to achieve high and stable conduction of Li ions to the electrode surface. 48 The SEI composition can be tuned by using additives in the electrolyte that will react at the surface before the electrolyte solvent and anion species.…”