To understand the origin of enhanced electrochemical performances MgO-coated LiCoO2 as cathode materials for lithium ion battery, we investigate internal structures at nanometer scale. The are annealed various temperatures 750–810 °C so to find optimized heat-treatment condition. surface morphologies and crystalline characterized by SEM, TEM, EELS, XRD. results show that delivers a high capacity with excellent retention property. In particular, sample 810 °C, which possesses doping level...

The encapsulation of Ni-rich cathode materials (LiNi0.6Co0.2Mn0.2O2) for lithium ion batteries in reduced graphene oxide (rGO) sheets is introduced to improve electrochemical performances. Using (3-aminopropyl)triethoxysilane, the active are completely wrapped with several rGO layers ∼2 nm thickness. By virtue great electrical conductivity graphene, rGO-coated exhibit much enhanced performances cycling property and rate capability. In addition, it shown that structural degradation materials,...

Conductive polymers (CPs) such as polypyrrole (PPY) are emerging biomaterials for use scaffolds and bioelectrodes which interact with biological systems electrically. Still, more electrically conductive biologically interactive CPs required to develop high performance medical devices. In this study, in situ electrochemical copolymerization of polydopamine (PDA) PPY were performed electrode modification. Their material properties characterized using multiple techniques. The electrical...

Quantum dots (QDs) have been used as fluorophores in various imaging fields owing to their strong fluorescent intensity, high quantum yield (QY), and narrow emission bandwidth. However, the application of QDs bio-imaging is limited because QY decreases substantially during surface modification step for bio-application.In this study, we fabricated alloy-typed core/shell CdSeZnS/ZnS (alloy QDs) that showed higher stability hydrophilization compared with conventional CdSe/CdS/ZnS multilayer...

Double-network hydrogels (DN-gels) prepared from the combination of a moderately cross-linked anionic polyelectrolyte (PE) and an uncross-linked linear polymer solution (NP) exhibit mechanical properties such as fracture toughness that are intriguingly superior to their individual constituents. The scheme double-network preparation, however, is not equally successful for all polyelectrolyte/neutral pairs. A example poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS) network...

Using atomistic simulation with empirical potential parameters, a layered metal oxide (LiNi1/3Co1/3Mn1/3O2) as cathode material for lithium ion battery is investigated in terms of energetics and dynamics. Structural characteristics, defect chemistry, doping effects are determined by calculation, which has been developed Islam et al., while dynamics properties characterized molecular simulation. The core–shell model force fields reproduced the unit-cell well matched experimental data. With...

By use of energetics calculation and classical molecular dynamics simulation, the structural characteristics, defect chemistry, Li+ ion migration, properties monoclinic Li3V2(PO4)3, which is one promising candidates for lithium battery cathode materials, are investigated. The empirical potential parameters reproduce experimentally determined unit-cell with good agreement. It expected that intrinsic defects such as Frenkel antisite would rarely form due to their high formation energy....

A lithium ionic conductor, Li1.3Al0.3Ti1.7(PO4)3 (LATP), is introduced as a coating material on the surface of Mg-doped LiCoO2 to improve electrochemical performances for high-voltage (4.5 V) ion batteries. Structure, morphology, elemental distribution, and electrical properties materials are thoroughly characterized by SEM, TEM, EELS, EDS, C-AFM. The layer electrically conductive with aid Mg ions which used dopant active materials; therefore, this mixed electronic conductor strongly...

Both the origin and mechanism of improvement in electrochemical performances post-thermal treated LiCoO2 as a cathode material for lithium ion batteries are investigated through high-quality characterization. X-ray diffraction transmission electron microscopy measurements revealed that high temperature sintering results Li deficiency consequent formation spinel LixCo2O4. The slow quenching allows two phases LixCo2O4 to intermix, whereas treatment at 800 °C separation phase surface LiCoO2....

Development of a tangible solid state battery has received great attention but there are various engineering challenges to overcome, especially for the scalable processing and use Li metal anode. In order tackle these issues, we first evaluated electrochemical stability thio-LISICON electrolytes, i.e., Li10GeP2S12 (LGPS), Li7P3S11 (LPS), Li7P2S8I (LPSI), where glass-ceramic LPSI electrolyte showed superior compatibility with metal. Moreover, superionic conductivity 1.35 × 10−3 S/cm could be...

Li-ion batteries are at risk of explosions caused by fires, primarily because the high energy density Li ions, which raises temperature. Battery cases typically made plastic, aluminum, or SAF30400. Although plastic and aluminum aid weight reduction, their strength melting points low. SAF30400 offers excellent corrosion resistance but suffers from work hardening low high-temperature 700 °C. Additionally, Ni used for plating has a current 25% international copper alloy standard (ICAS). SAF2507...

Lithium transition metal pyrophosphate materials (Li2MP2O7, M: Mn, Fe, and Co) have been proposed as promising novel cathode for lithium ion batteries. Using atomistic simulation with empirical potential parameters, which has validated on various by Islam et al. [Phil. Trans. R. Soc. A2010, 368, 3255–3267], these new pyrophosphates are investigated to elucidate structure, defect chemistry, Li+ transport pathway. The core–shell model force fields reproduces the experimental unit-cell...

Conductive polymers, including polypyrrole (PPy), have been extensively explored to fabricate electrically conductive biomaterials for bioelectrodes and tissue engineering scaffolds. For their in vivo uses, a sterilization method without severe impairment of original material properties performance is necessary. Gamma-ray radiation has commonly applied medical products because its simple uniform heat generation. Herein we describe the first study on gamma-ray PPy effects characteristics. We...

A molecular mechanism is proposed for the toughness enhancement observed in double-network (DN) hydrogels prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) polyelectrolyte network and poly(acrylamide) (PAAm) linear polymer. It an extension of phenomenological model set forth recently by Gong et al. ( Macromolecules 2007, 40, 6658- 6664 ). This rationalizes changes structure DN gel constituents via situ neutron scattering measurements, composition dependence solution...

Bioelectrodes are key components of electronic devices that efficiently mediate electrical signals in biological systems. However, conventional bioelectrodes often undergo biofouling associated with non-specific proteins and cell adhesion on the electrode surfaces, which leads to seriously degraded and/or electrochemical properties. Hence, a facile effective method modify surface is required introduce anti-biofouling properties improve performance. Here, we report an modification...

Weaponized spores of a pathogenic bacterium such as Bacillus anthracis are new critical threat to mankind. The occurrences in New York and south Florida 2001 showed the potential capability be used for mass destruction. Due their stealthiness during infection resistance harsh environment, an early prompt detection before they endanger population is significant issue. In this paper, we present method instant identification subtilis (nonpathogenic simulant anthracis) by constructing dual...

The electrochemical properties of Li(Ni<italic>x</italic>Co<italic>y</italic>Mn<italic>z</italic>)O₂ (NCM) materials are decisively determined by the interplay combined disordering cations and relevant chemical/electronic changes.

To explore the possibility of LiFeSO4F with two polymorphs (tavorite and triplite) as cathode material for lithium ion batteries, structure, defect chemistry, Li+ conduction properties are studied by atomistic simulation empirical potential parameters. We investigate correct structure tavorite LiFeSO4F, which was newly determined. The concentration intrinsic defects in form is very low comparison triplite form. Configurations FeO4F2 octahedra favor corner-sharing connections over...