Pseudocapacitive Storage in Nanolayered Ti2NTx MXene Using Mg-Ion Electrolyte

Rational design of efficient electrode–electrolyte interfaces for solid-state energy storage using ion soft landing

The rational design of improved electrode-electrolyte interfaces (EEI) for energy storage is critically dependent on a molecular-level understanding of ionic interactions and nanoscale phenomena. The presence of non-redox active species at EEI has been shown to strongly influence Faradaic efficiency and long-term operational stability during energy storage processes. Herein, we achieve substant...

Ultra-high-rate pseudocapacitive energy storage in two-dimensional transition metal carbides

The use of fast surface redox storage (pseudocapacitive) mechanisms can enable devices that store much more energy than electrical double-layer capacitors (EDLCs) and, unlike batteries, can do so quite rapidly. Yet, few pseudocapacitive transition metal oxides can provide a high power capability due to their low intrinsic electronic and ionic conductivity. Here we demonstrate that two-dimension...

Pseudocapacitive oxide materials for high-rate electrochemical energy storage

Nanoscale spinel LiFeTiO4 for intercalation pseudocapacitive Li(+) storage.

Intercalation pseudocapacitive Li(+) storage has been recognized recently in metal oxide materials, wherein Li(+) intercalation into the lattice is not solid-state diffusion-limited. This may bridge the performance gap between electrochemical capacitors and battery materials. To date, only a few materials with desired crystal structure and with well-defined nanoarchitectures have been found to ...

Lithium-ion capacitors with 2D Nb2CTx (MXene) - carbon nanotube electrodes

3 types of lithium-ion capacitors using Nb2CTx-CNT as one electrode were tested. The highest volumetric energy density of 50e70 Wh/L was achieved. Energy density of symmetric cell exceeds that of lithium titanate/acti-