A mesoporous nanocomposite of TiO2 and cut single-walled carbon nanotubes (c-SWNTs) is successfully synthesized by a bicontinuous microemulsion-aided process. The electrode (see Figure) shows high capacity even at charging–discharging rates due to the presence nanochannels for both ion electron transport.

The effect of crystallite size on Li-ion insertion in electrode materials is great interest recently because the need for nanoelectrodes higher-power rechargeable batteries. We present a systematic study electrochemical properties LiMn2O4. Accurate control nanocrystalline LiMn2O4, which realized by hydrothermal method, significantly alters phase diagram as well voltage. Nanocrystalline LiMn2O4 with extremely small 15 nm cannot accommodate domain boundaries between Li-rich and Li-poor phases...

Porous carbons with large meso/macropore surface areas were prepared by the colloidal-crystal-templating technique. The porous exibited extremely high specific electrochemical double layer (EDL) capacitance of 200−350 F g-1 in an aqueous electrolyte (1 M H2SO4). pore structure dependence was studied mainly means cyclic voltammetry and is discussed detail. From sweep rate series resistance capacitance, it found that ion-penetration depth at electrode finite decreased increasing rate. Peaks...

Interface structure between Li and garnet-type Li6.5La3Zr1.5Ta0.5O12 (LLZT) solid electrolyte was investigated by means of electrochemical impedance spectroscopy (EIS) on symmetric cells | LLZT Li. Charge transfer resistance (RCT) using pellets with various roughness. RCT activation energy (Ea) obtained the flat interface is as high 746 Ω cm2 0.51 eV at 25°C, respectively, indicating that charge reaction (grit number: #8000) a kinetically slow process, which may suppress rate capability all...

Abstract The silver ionic conductivity in heterogeneous systems of AgBr:Al 2 O 3 and AgI:Al is highly enhanced by utilizing mesoporous Al as the insulating phase. highest Ag + 3.1 × 10 –3 Ω –1 cm (at 25 °C) has been obtained for composite with an volume fraction 0.3. For , enhancement satisfactorily explained framework ideal space‐charge model, while case stacking disorder also considered to contribute conductivity.

Interfacial resistance is one of the severe problems in composite electrodes all solid state batteries (ASSBs), especially oxide-type ASSBs. Conflicts between poor sinterability and possible unfavorable reaction with active materials limit applicable processes. In this report, a novel approach proposed to decrease grain boundary among nonsintered electrolyte particles. The concept successfully demonstrated, highly conducting (Li1.3Al0.3Ti1.7(PO4)3) was suppressed by being coated poorly...

Bimodal porous carbons with both micropores and meso- or macropores were selectively synthesized by an colloidal crystal-templating process. The opal templates exclusively contributed to the formation of in carbons. electrical double-layer capacitance per surface area templated was much larger than those commercially available activated high areas. generated shows a highly efficient capacitive property; specific originating from and/or estimated be © 2004 Electrochemical Society. All rights reserved.

Nanoporous composite electrodes for lithium ion batteries were successfully fabricated by coating porous carbon with V2O5 gel, and their high rate capability was demonstrated. The carbons prepared using SiO2 colloidal crystals as templates exhibited ordered three dimensionally interconnected pores. immersed in sol under reduced pressure repeatedly to obtain V2O5/carbon composites. nanoporous composites thus obtained large capacity of more than 100 mAh (g-composite)-1 good 80% at 5.0 A...

Schematic representation of Li growth during DC polarization experiments in the investigated garnet-type metal oxides.

Lanthanum oxide thin films were fabricated on Si substrates by the metallorganic chemical vapor deposition (MOCVD) method at substrate temperatures ranging from 400 to 650°C. From results of X-ray photoelectron spectroscopy (XPS), diffraction (XRD), cross-sectional scanning transmission electron microscopy (STEM), and energy-dispersive (EDX) analyses, enhanced reaction interface between was revealed, which in generation an interfacial layer (1-2 nm thick) lanthanum silicate all experimental...

A (K,Na)NbO3-based lead-free piezoelectric ceramic was successfully densified. It exhibited an enhanced electromechanical coupling factor of kp = 0.52, a constant d33 252 pC/N, and frequency Np 3170 Hz m because the incorporation elaborate secondary phase composed primarily KTiNbO5. The ceramic's nominal composition 0.92K0.42Na0.44Ca0.04Li0.02Nb0.85O3–0.047K0.85Ti0.85Nb1.15O5–0.023BaZrO3–0.0017Co3O4–0.002Fe2O3–0.005ZnO, abbreviated herein as KNN–NTK composite. dense microstructure with few...

Li-stuffed garnet-type solid Li-ion electrolytes have been considered as a promising candidate for all-solid-state Li batteries. In this work, alkaline earth metal-doped electrolytes, Li6.5La2.5A0.5TaZrO12 (A = Ca, Sr, Ba) were prepared by conventional solid-state sintering (CSS) and spark plasma (SPS) methods. The effect of methods on the structural electrochemical properties was investigated powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), impedance spectroscopy (EIS)....

Chemical stability of garnet-type lithium ion conductors is one the critical issues in their application all-solid-state batteries. Here, we conducted quantitative analysis impurity layers on solid electrolytes, Li6.5La3–xAExZr1.5–xTa0.5+xO12 (x = 0 and 0.1; AE Ca, Sr, Ba), by means X-ray photoelectron spectroscopy (XPS) electrochemical methods. Two complimentary XPS techniques were employed: (i) background analyses Tougaard's method (ii) relative intensity La 3d/La 4d spectra to determine...

The effect of pulsed laser irradiation on silver particles in aqueous solution was investigated. particle size decreased and the distribution became narrower after for 15 minutes using third harmonics a YAG laser. number aggregated also irradiation.

Order or disorder often exists in a uniform spin system consisting of one kind magnetic ion. Nevertheless, they rarely coexist normal conditions. Our thermodynamic and microscopic studies ${\mathrm{Co}}_{2}(\mathrm{OH}{)}_{3}\mathrm{Cl}$, distorted tetrahedral lattice compound with ${\mathrm{Co}}^{2+}$ spin, demonstrate that the spins located on corner tetrahedron are periodically ordered, but those other three disordered below ferromagnetic transition at ${T}_{C}=10.5\text{ }\text{...

All solid state batteries are attracting interests as next generation energy storage devices. However, little is known on interfaces between active materials and electrolytes, which may affect performance of the In this study, interfacial phenomena electrodes electrolytes all were investigated by using nano-composites Li2SiO3-TiO2, Li2SiO3-LiTiO2, Li2SiO3-FePO4. Studies ionic conductivity these composites revealed lithium ion transfer across without electric field, depended electrode...