Publications

Sep, 2015

Journal

Understanding the Role of NH4F and Al2O3 Surface Co-modification on Lithium-Excess Layered Oxide Li1.2Ni0.2Mn0.6O2

In this work we prepared Li1.2Ni0.2Mn0.6O2 (LNMO) using a hydroxide co-precipitation method and investigated the effect of co-modification with NH4F and Al2O3. After surface co-modification, the first cycle Coulombic efficiency of Li1.2Ni0.2Mn0.6O2 improved from 82.7% to 87.5%, and the reversible discharge capacity improved from 253 to 287 mAh g−1 at C/20. Moreover, the ra…

Aug, 2015

Journal

Origin of high Li+ conduction in doped Li7La3Zr2O12 garnets

Jul, 2015

Journal

Correlation of Anisotropy and Directional Conduction in β-Li3PS4 Fast Li+ Conductor

Nov, 2014

Journal

A Search for Temperature Induced Time-dependent Structural Transitions in 10mol%Sc2O3–1molO2–ZrO2 and 8mol%Y2O3–ZrO2 Electrolyte Ceramics

Both Sc2O3–CeO2-stabilized-ZrO2 (SCSZ) and Y2O3-stabilized-ZrO2 (YSZ) show similar Young's modulus damping at 175–400 °C and 200–400 °C, respectively, by impulse excitation acoustic technique. The phase transition in SCSZ is considered responsible for the damping; however for YSZ, such a phase transition has never been reported. To clarify the relation of damping and struc…

Sep, 2014

Journal

A High-Conduction Ge Substituted Li3AsS4 Solid Electrolyte with Exceptional Low Activation Energy

Lithium-ion conducting solid electrolytes show potential to enable high-energy-density secondary batteries and offer distinctive safety features as an advantage over traditional liquid electrolytes. Achieving the combination of high ionic conductivity, low activation energy, and outstanding electrochemical stability in crystalline solid electrolytes is a challenge for the…

Aug, 2014

Journal

Revealing cyclic hardening mechanism of a TRIP steel by real-time in situ neutron diffraction

Real-time in situ neutron diffraction was performed on a transformation-induced plasticity (TRIP) steel under cyclic loading at room temperature. By Rietveld refinement and single peak analysis, the volume fraction and average stress estimates as well as dislocation density of individual phases (austenite and martensite phase) were derived. The results reveal that the volu…

Jul, 2014

Journal

Phase-specific deformation behavior of a relatively tough NiAl-Cr(Mo) lamellar composite

Jul, 2014

Journal

In-situ neutron diffraction of LaCoO3 perovskite under uniaxial compression. I. Crystal structure analysis and texture development

The dynamics of texture formation, changes in crystal structure and stress accommodation mechanisms are studied in R3c rhombohedral LaCoO3 perovskite during in-situ uniaxial compression experiment by neutron diffraction. The neutron diffraction revealed the complex crystallographic changes causing the texture formation and significant straining along certain crystallograph…

Jul, 2014

Journal

In-situ neutron diffraction of LaCoO3 perovskite under uniaxial compression. II. Elastic properties

Jun, 2014

Journal

Visualizing the Structural Evolution of LSM/xYSZ Composite Cathodes for SOFC by in-situ Neutron Diffraction

Composite cathodes for solid oxide fuel cells, the mixtures of (La0.8Sr0.2)0.95MnO3-δ (LSM) and (Y2O3)x(ZrO2)1-x (xYSZ, x = 3, 6, 8 and 10), have the thermal stability unraveled at elevated temperatures by using in-situ neutron diffraction. The Rietveld refinement analysis of neutron diffraction visualizes the phase evolutions and the ion activities in the material systems…

Mar, 2014

Journal

Novel chemically stable Ba3Ca1.18Nb1.82-xYxO9-δ proton conductor: improved proton conductivity through tailored cation ordering

Simple perovskite-structured proton conductors encounter significant challenges to simultaneously achieving excellent chemical stability and proton conductivity that are desirable for many important applications in energy conversion and storage. This work demonstrates that Y-doped complex-perovskite-structured Ba3Ca1.18Nb1.82–xYxO9−δ materials possess both improved proton…