Lithium intercalation and de-intercalation processes have been used to fabricate bulk Bi(2)Se(0.3)Te(2.7) with internal nanostructures. The doped Li content can be precisely controlled through this method. It provides a chance to directly optimize electrical properties when preparing nano-structured materials, leading to the optimum carrier concentration for improved thermoelectric figure of me...

Magnesium ion based batteries hold promise as a competitive alternative to conventional Lithium ion battery technology due to several key features. Theoretical volumetric capacity for magnesium metal anode is much higher compared to lithium metal. Furthermore, Mg is more readily available compared to Li, which can potentially lead to cost reduction and switching to Mg offers safety benefits ove...

Graphite has long been the most used commercial anode material in Li-ion batteries. However, it has a limited Li intercalation capacity of 372 mAh g , which cannot meet the increasing energy demand for Li-ion batteries. Here, we propose massive artificial graphite as a host material for the controlled deposition and stripping of Li metal within the internal space of the particles and demonstrat...

Since its appearance in 1991, the Li ion battery has been the major power source driving the rapid digitalization of our daily life; however, much of the processes and mechanisms underpinning this newest battery chemistry remains poorly understood. As in any electrochemical device, the major challenge comes from the electrolyte/electrode interfaces, where the discontinuity in charge distributio...

Silicon is one of the most promising anode materials for future rechargeable batteries because of its high theoretical capacity. New crystalline Li15Si4 was found as the fully electrochemical lithiated phase of crystalline Si or amorphous Si. Density functional theory was used to study the crystal and electronic structure of Li15Si4. Li15Si4 is formed by the unit figure in which six Li atoms su...

the entro y s of intercalation compounds from W describe the first measurements of changes in ropy e e d 1 of intercalation accurately describes the variation etr of electrochemical cells. A lattice-gas mo e e calorime y rature T with no adjustable parameters. This agreement of (ils/Bx)T with x in Li„Mo6se& at fixed temperature t j L M Se for x & 1 are randomly distributed over a single type of...

Platelet- and fibrillar-structured V2O5 films have been prepared by solution methods, and their electrochemical Li+ intercalation properties have been studied. Platelet film consists of 20-30 nm sized V2O5 particles with random orientation, whereas fibrillar film is comprised of randomly oriented fibers though most of them protrude from the substrate surface. These platelet- and fibrillar-struc...

A change in the electronic spin state of the surfaces relevant to Li (de)intercalation of nanosized stoichiometric lithium cobalt oxide LiCo(III)O(2) from low-spin to intermediate and high spin is observed for the first time. These surfaces are the ones that are relevant for Li (de)intercalation. From density functional theory calculations with a Hubbard U correction, the surface energies of th...

Yvan Reynier,1,2 Jason Graetz,1 Tabitha Swan-Wood,1 Peter Rez,3 Rachid Yazami,1,2 and Brent Fultz1 1California Institute of Technology, W. M. Keck Laboratory, Pasadena, California 91125, USA 2CNRS (UMR5631)-BP75 38402 St. Martin d’Heres, France 3Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287, USA (Received 26 February 2004; revised manuscript received 2 July...