batterydata/paper-abstracts huggingface dataset:
Lithium-Ion Batteries lack performance and are costly for applications such as electric vehicles and electric energy storage systems. Multiphysics based battery models are one of the engineering tools to enhance their performance. In this regard, simulations have not only to provide qualitative but also quantitative valuable information. Our work focuses on the characterization and modelling of Li x Ni1/3Mn1/3Co1/3O2 based cells which has not been fully addressed yet. First, we present a modified multiphysics model compared to the conventional porous electrode theory for simulating these type of cells. The correspondence with experimental results is satisfactory but the model fails to accurately predict the voltage drop at high current rates.
A study was carried out to see if the potential of renewable energy sources other than hy droelectric power, such as wind, photovoltaic, solar thermal, biomass and waste energy sources, can meet the current energy consumption in Yakushima. The current electricity consumption can be covered by wind and photovoltaic energy sources. The total potential of wind and photovoltaic energy sources is 5.4 times as much as the current electricity consumption. LP gas and kerosene can be replaced by solar thermal and biogas energy. The potential of plant biomass and municipal waste is not sufficient (approximately one third) to cover the rest of the fossil fuels (gasoline, diesel oil and heavy oil). Also, plant biomass and municipal waste must be converted into fluid form. This shortage can be covered by the po tential of wind and photovoltaic energy sources. We also investigated the possibility of tourism expansion using the potential of wind and photovoltaic energy sources. Taking into account three types of capacity (energy, accommodation and transportation), Yakushima can accept approximately four times as many tourists as the current number of tourists.
Alkali (Li, Na, K) ion battery have practically or potentially been widely used as a power source for portable electronic devices and electric vehicles. However, lack of universal anodes for these three alkali ion battery are restricting their development, especially for Na-ion battery and K-ion battery. Rhenium disulfide (ReS2), with large interlayer space and weak van der Waals interaction between layers, can afford massive alkali (lithium, sodium, and potassium) ions to diffuse easily between the layers. However, its low electronic conductivity and large volume changes in the conversion reaction significantly compromise the cycle life. To address this issue, here, we anchor ReS2 nanosheets onto nitrogen doped carbon nanofibers (N-CNF) which forms a flexible ReS2/N-CNFs paper for alkali (Li, Na, and K) ion battery anodes. The carbon nanofibers (CNFs) can improve the conductivity and the doped nitrogen can absorb sulfur and polysulfide generated by the conversion reaction. As a result, the ReS2/N-CNFs composite anode maintains a reversible capacity of 430 mAh/g after 400 cycles at 100mA/g in LIBs, 245mAh/g after 800 cycles at 100mA/g in NIBs, and 253 mAh/g after 100 cycles at 50mA/g in KIBs. This performance is one of the best among all ReS2 reported up to date. In addition, the solid electrolyte interface formation on ReS2 and the coulombic efficiency in different alkali ion batteries are also systemically investigated.
Aqueous alkaline batteries represent a promising kind of energy storage device, which hold great promise in power electronics with both high energy density and power density. However, their development is severely limited by their anodes which have unsatisfactory cycling stability. In this study, we report a new kind of oxygen vacancy activated Bi2O3 (Bi2O3-x) nanoflowers on carbon paper as robust anode in alkaline batteries via a hydrothermal growth and a following hydrogenation treatment. Owing to the enhanced charge transport rate after introducing oxygen vacancies, the resulting binder-free Bi2O3-x nanoflowers achieve a high capacitance of 0.97 mAh/cm2 at 4 mA/cm2 in a negative potential window from 0 to −1.2 V vs Hg/HgO, remarkably larger than the pristine Bi2O3 nanoflowers (0.6 mAh/cm2). Furthermore, this Bi2O3-x anode also owns excellent durability with a capacity retention of 73.8% after 5000 cycles. This work may contribute additional insight into the construction of high-performance anodes for alkaline batteries.
We identify technological drivers for tomorrow’s data centers and telecommunications systems, including thermal, electrical and energy management challenges, based on discussions at the 2nd Workshop on Thermal Management in Telecommunication Systems and Data Centers in Santa Clara, California, on April 25–26, 2012. The relevance of thermal management in electronic systems is reviewed against the background of the energy usage of the information technology (IT) industry, encompassing perspectives of different sectors of the industry. The underlying drivers for progress at the business and technology levels are identified. The technological challenges are reviewed in two main categories – immediate needs and future needs. Enabling cooling techniques that are currently under development are also discussed.
Software Defined Network (SDN) brought revolution in the network field with the partnership of Academia and Industry.
SDN bridges the gap to overcome issues of IoT deployment, optimization and better utilization of network resources. The escalation in resource congestion in Wireless Sensor Networks (WSNs) can usually lead to scalability, data computation or storage, and energy efficiency problems with only a single sink node for data acquisition. Internet of Things (IoT) has resource and energy constraints for WSN devices. Low Power and Lossy Networks (LLNs) ought to be optimized for traffic with multiple sinks. RPL routing has constraints to support this approach. However, RPL inherits the ability to offer features like Auto-Configuration, Self-Healing, Loop avoidance, and detection. These features of RPL can be transformed into the improved performance of a WSN by increasing the number of sinks with a linear increase of data transmitting nodes in the network. Further, to mitigate the escalated computing needs, edge computing has emerged as a new paradigm to resolve SDN-enabled IoT and localized computing needs. This study proposes an SDN-based solution to the interconnectivity of resource constraint LLN devices with edge computing routers in mesh and cluster topological scenario using RPL as IoT routing protocol. Performance evaluation concerning different routing metrics and objective functions: Minimum Rank with Hysteresis Function (MRHOF) and Zero (OF0) are analyzed. COOJA simulator is used for emulation of random as well as linear grid topologies for the creation of WSN static nodes. Simulation results confirm that the gradual increase of a number of nodes from 16, 32, 48, 64 and a simultaneous increase in sinks nodes as 1, 2, 3, 4 respectively in LLN network reflects the desired advantages with the stable network.
Balancing Everyday Life (BEL) is a new activity-based lifestyle intervention for mental health service users. An earlier study found BEL to be effective in increasing occupational engagement, occupational balance, activity level, and quality of life scores when compared with a care-as-usual group. However, it is unclear whether care context and socio-demographic, clinical and self-related factors at baseline also influence the results. Thus, the aim of the current study was to explore whether such factors could predict clinically important improvements in occupational and quality of life aspects.
Aqueous battery systems feature high safety, but they usually suffer from low voltage and low energy density, restricting their applications in large-scale storage. Here, we propose an electrolyte-decoupling strategy to maximize the full potential of Zn–MnO2 batteries by simultaneously enabling the optimal redox chemistry of both the Zn and MnO2 electrodes. The decoupled Zn–MnO2 battery exhibits an open-circuit voltage of 2.83 V (in contrast to the typical voltage of 1.5 V in conventional Zn–MnO2 batteries), as well as cyclability with only 2% capacity fading after deep cycling for 200 h. Benefiting from the full utilization of MnO2, the Zn–MnO2 battery is also able to maintain approximately 100% of its capacity at various discharge current densities. We also demonstrate the feasibility of integrating the Zn–MnO2 battery with a wind and photovoltaic hybrid power generating system. This electrolyte-decoupling strategy is shown to be applicable for other high-performance zinc-based aqueous batteries such as Zn–Cu and Zn–Ag batteries.
Abstract According to recent studies, about 60% of plastics failures come from a wrong selection of the used plastic grade. This chapter aims at helping to define the problem, pointing out the difficulty of a right choice of a defined plastic material taking into account a broad range of interactive parameters linked to the polymer properties, on the one hand, and surrounding stresses and media, on the other hand. Some thermoplastic features can surprise designers usually working with steels and other metals: the sensitivity to temperature, humidity, creep, chemicals, and viscoelasticity. The final choice results from numerous iterations, leading to a subtle balance of technical requirements, economic considerations, and targeted lifetime. The ins and outs linked to the main interactions between thermoplastics properties (mechanical, physical, aging, sensorial), surrounding parameters (temperature, time, stresses, chemicals…), economics, regulations, green trends, and lifetimes are examined. A checklist of 125 good questions concludes this chapter.
This paper presents a fractional-order model (FOM) for lithium-ion batteries and its parameter identification using time-domain test data. The FOM is derived from a modified Randles model and takes the form of an equivalent circuit model with free non-integer differentiation orders. The coefficients and differentiation orders of the FOM are identified by hybrid multi-swarm particle swarm optimization. The influence of approximation degree on model accuracy is discussed. Battery datasets under a range of conditions are used to analyze model performance. The accuracy and robustness of the FOM are benchmarked against the commonly used first-order RC equivalent circuit model.
Hybrid energy system is increasingly emerging as an option to produce energy for the remote areas. This paper presented an economic feasibility analysis of a single standalone house operating with a hybrid power plant consisting of a fixed capacity producer gas generator (2 kWe) and other renewable energy sources (Photovoltaic and wind). The National Renewable Energy Laboratory's Hybrid Optimization Model for Electric Renewable (HOMER) was employed which evaluated techno-economic analysis based on the criteria of net present cost and levelized cost of electricity. Taking the site specific daily average solar radiation, average wind speed and load data into account, renewable hybrid model consisting of Bio/PV (Photovoltaic)/wind/battery/capacitor was found feasible giving 19,866 kWh/yr. of energy with a levelized cost of electricity of 0.306 kWh/yr. While comparing the hybrid system with a diesel or, natural gas generator alone, the maximum savings from CO2 emissions worth 22,626 kg/yr. was achieved. The sensitivity analysis over a range of diesel/natural/producer gas price (0.1 $/L to 1 $/L or, 0.1 $/m3 to 1.0 $/m3) showed that in addition to the environmental benefits hybrid energy configuration could result economic advantages when the producer gas price does not exceed the threshold of 0.1 $/m3.
Alkaline water electrolyzers promise very high purity hydrogen gas production but suffer from large overpotential for anodic oxygen evolution reaction (OER). Here we describe the effect of lithium (Li+)-substitution into nickel oxide on the electrocatalytic activity towards OER in alkaline electrolyte. The X-ray diffraction patterns of lithiated nickel oxides (Li x Ni1−x O, x = 0.00–0.50) synthesized by the solution-combustion method suggest that pure phase of lithiated nickel oxide was formed until x = 0.30; thereafter, a secondary phase of LiNiO2 was observed. Rietveld analysis showed that Li+-substitution caused a contraction in the lattice structure as shown by the decrease in lattice parameters upon Li+-substitution. Further, the weight fraction of LiNiO2 was found to be dominant for x = 0.50. Deconvolution of the high resolution X-ray photoelectron spectroscopy for O 1s and Ni 2p spectra suggested that concentration of oxygen vacancies increased linearly, whereas that of Ni3+ increased till x = 0.30 and it decreased when Li+-substitution was further increased to x = 0.40 and 0.50. Although electrical conductivity increased upon Li+-substitution, no significant effect was observed for lithiated samples with varying Li+-content (x = 0.10–0.50). The activities for OER were measured using the rotating disk electrode in 0.5 M NaOH electrolyte, and the data suggest that lithiated nickel oxide synthesized with x = 0.30 shows the highest current density at 1.70 vs. RHE (V). The decrease in OER activity for x = 0.40 and 0.50 was attributed to the decline in OER active Ni3+ sites (probably due to the presence of chemically unstable LiNiO2).
The results of the Japanese national project of R&D on large-size lithium rechargeable batteries by Lithium Battery Energy Storage Technology Research Association (LIBES), as of fiscal year (FY) 2000 are reviewed. Based on the results of 10Wh-class cell development in Phase I, the program of Phase II aims at further improvement of the performance of large-size cells and battery modules, and the formulation of roadmaps toward worldwide dissemination of large-size lithium secondary batteries. In addition to the above R&D programs, a new target was presented particularly for the near-term practical application of several kWh-class battery modules in FY 1998. For the large-size battery modules, two types of 2 and 3kWh-class battery modules have been developed for stationary device and electric vehicle applications, respectively. The battery modules for both types have achieved most of the targets other than cycle life. Currently, further improvements in the cycle life of the cells themselves are being pursued. For this purpose, the materials for cathodes and anodes, the shapes and structures for batteries and the methods for cell connection are being re-investigated. The development of middle-size battery systems for mini-size electric vehicles (EVs), as well as for demand-side stationary device applications is under way. These battery systems have been fabricated and their fundamental performance confirmed. They are now being subjected to field tests.
The ongoing release of the Human Connectome Project (HCP) data is a watershed event in clinical neuroscience. By attaining a quantum leap in spatial and temporal resolution within the framework of a twin/sibling design, this open science resource provides the basis for delineating brain-behavior relationships across the neuropsychiatric landscape. Here we focus on attention-deficit/hyperactivity disorder (ADHD), which is at least partly continuous across the population, highlighting constructs that have been proposed for ADHD and which are included in the HCP phenotypic battery. We review constructs implicated in ADHD (reward-related processing, inhibition, vigilant attention, reaction time variability, timing and emotional lability) which can be examined in the HCP data and in future ‘high definition’ clinical datasets.
The nociceptive blink reflex (nBR) can be useful to investigate trigeminal nociceptive function. The aim of this study was to estimate the reliability of the nBR evoked by electrical stimulation of the three branches of the trigeminal nerve under the following conditions: over time (test-retest and intrarater reliability) and by two examiners (interrater reliability).
Li4Ti5O12/n-Ag composite powders were investigated using Cyclic Voltammetry and Electrochemical Impedance Spectroscopy methods to understand the reasons behind enhanced electrochemical properties of lithium-titanium oxide after silver nanoparticles deposition. CV measurements revealed increased chemical diffusion coefficient values for Li+ ions inside lithium-titanium oxide matrix for samples modified with silver nanoparticles. It has been shown, that increasing amount of n-Ag on the surface of LTO resulted in enhanced lithium mobility in host material. EIS experiments confirmed the chemical diffusion coefficient trend and also showed a decrease in Li4Ti5O12/n-Ag electrodes' impedance. The electrochemical properties of examined powders did not change significantly above 3% wt. content of n-Ag in composite materials.
Stretchability and compressibility are essential features for next-generation flexible energy storage devices. Most previous studies on stretchable and compressible energy storage devices have focused on supercapacitors, whereas the intrinsically stretchable and compressible batteries are rarely reported for the lack of a stretchable and compressible high-performance electrolyte as well as highly conductive flexible electrodes. Here, a new type of intrinsically stretchable and compressible battery is fabricated for the first time, by employing a sodium polyacrylate (PANa) hydrogel as electrolyte, and nickel cobalt hydroxide and zinc nanosheets deposited on Au@CNT papers as electrodes. The newly developed battery can be intrinsically stretched up to 400% strain (capacity enhanced) and compressed to 50% strain (capacity well retained). After being stretched for 500 cycles and compressed for 1500 cycles, the battery is able to deliver 87% and 97% of its initial capacity, respectively.
The performance of nickel hydroxide/carbon asymmetric supercapacitors has been studied with a range of positive and negative active material ratios. The utilisation of the nickel hydroxide electrode in asymmetric supercapacitors was found to be a function of the mass ratio of the positive and negative electrode materials and not independent as previously assumed. Previous models describing the behaviour of asymmetric supercapacitors assumed that the voltage swing was entirely due to the polarisable electrode. These models were found to be inadequate for describing the rate dependant charge/discharge behaviour of asymmetric supercapacitors. The mass ratio of the active materials was determined to be an important factor in predicting the observed behaviour and has been incorporated into an improved model.
Garnet-type solid electrolytes are one of key materials to enable practical usage of lithium metal anode for high-energy-density batteries. However, it suffers from lithium growth in pellets on charging, which causes short circuit. In this study, grain boundaries of Li6.5La3Zr1.5Ta0.5O12 (LLZT) pellets are modified with Li2CO3 and LiOH to investigate the influence of the microstructure of grain boundaries on lithium growth and to study the mechanism of the lithium growth. In spite of similar properties (relative density of ca. 96% and total ionic conductivity of 7 × 10−4 S cm−1 at 25 °C), the obtained pellets exhibit different tolerance on the short circuit. The LLZT pellets prepared from LiOH-modified LLZT powders exhibit rather high critical current density of 0.6 mA cm−2, at which short circuit occurs. On the other hand, the LLZT pellets without grain boundary modification short-circuited at 0.15 mA cm−2. Microstructural analyses by means of SEM, STEM and EIS suggest that lithium grows through interconnected open voids, and reveal that surface layers such as Li2CO3 and LiOH are not only plug voids but also facilitate the sintering of LLZT to suppress the lithium growth. The results indicate a strategy towards short-circuit-free lithium metal batteries.
Mesoporous lithium titanate microsphere anodes have been made by hydrothermal synthesis. Layered hydrous lithium titanate was obtained after hydrothermal reaction and Li4Ti5O12 microspheres assembled from nanosheets were subsequently formed by thermal treatment. This results in improved voltage profiles and charge/discharge dynamics. Mesoporous lithium titanate microspheres showed stable cycling performances, with high capacity retention (140 mAh g−1) even after 4000 cycles. In order to understand the functioning of this promising anode material at the molecular level, we used in-situ X-ray absorption spectroscopy (XAS). The XAS results verify the Ti conversion between Ti4+ and Ti3+ during charge/discharge cycling and demonstrate that this reduction is accompanied by small changes Ti–O distance but no detectable change in Ti–Ti distance. This anion re-arrangement suggests a structural explanation for the fact that this material is electrochemically very stable even under higher current density cycling.
Hepatic glucose production is crucial for glucose homeostasis, and its dysregulation contributes to the pathogenesis of diabetes. Here, we show that members of the NR4A family of ligand-independent orphan nuclear receptors are downstream mediators of cAMP action in the hormonal control of gluconeogenesis. Hepatic expression of Nur77, Nurr1 and NOR1 is induced by the cAMP axis in response to glucagon and fasting in vivo and is increased in diabetic mice that exhibit elevated gluconeogenesis. Adenoviral expression of Nur77 induces genes involved in gluconeogenesis, stimulates glucose production both in vitro and in vivo, and raises blood glucose levels. Conversely, expression of an inhibitory mutant Nur77 receptor antagonizes gluconeogenic gene expression and lowers blood glucose levels in db/db mice. These results outline a previously unrecognized role for orphan nuclear receptors in the transcriptional control of glucose homeostasis.
Microbiological confirmation cannot be obtained in approximately two-third patients with tuberculous meningitis. In this study, we sought to identify epidemiological, clinical, cerebrospinal fluid, and imaging parameters that could indicate the possibility of microbiological confirmation among patients with suspected tuberculous meningitis.
Hydrogen evolution reaction (HER) through low-cost and earth-abundant electrocatalysts at low overpotentials is a crucial project to clean energy. Molybdenum dioxide/reduced graphene oxide/polyimide-carbon nanotube (MoO2/RGO/PI-CNT) film was synthesized by a simple electrodeposition method as an efficient catalyst for HER. MoO2 nanoparticles with a small size of 10–20 nm uniformly disperse on the RGO surface. The large quantity and small size of MoO2 nanoparticles afford large surface area for HER, greatly enhancing the electrocatalytic performance of MoO2/RGO/PI-CNT film. The HER electrocatalytic property of MoO2/RGO/PI-CNT film in acidic solution is evaluated by linear sweep voltammetry (LSV). MoO2/RGO/PI-CNT film exhibit a high electrocatalytic activity for HER at a small onset overpotential (−110 mV vs RHE) with a high current density (10.0 mA cm−2) and a good stability. The low Tafel slope (68 mV dec−1) reveals the Volmer-Heyrovsky mechanism for HER. The comparison between MoO2/RGO/PI-CNT film and other catalysts indicate that the MoO2/RGO/PI-CNT film had a great performance for HER. This work presents a new thought for the synthesis of MoO2/RGO/PI-CNT film as an efficient HER electrocatalyst.
Imidazolium-based ionic liquid is one of attractive candidates for advanced lithium battery electrolyte. However, its cathodic stability is not sufficient for the reversible charge–discharge of negative electrodes. The authors previously proposed a quaternary ammonium-based ionic liquid containing a cyano group (cyano-QA) as a film-forming electrolyte on the negative electrode surface. In the present study, several cyano-QA ionic liquids have been prepared and their electrolyte properties have been estimated. Some ionic liquids based on cyano-containing quaternary ammonium cation provided reversible lithium deposition/dissolution couple when they were used as ‘co-solvent’ of electrolyte with the co-existence of EMITFSI.