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"Discharge process"

Beibei Wang, Shaobo Cai, Gang Wang, Xiaojie Liu, Hui Wang, Jintao Bai
Hierarchical ultrathin NiCo2O4 nanosheeets grown on uniform hollow carbon microspheres (HC@NiCo2O4) are designed and fabricated by a solvothermal reaction followed with an annealing process. When evaluated as an anode for lithium ion batteries, the as-prepared HC@NiCo2O4 microspheres exhibit excellent electrochemical performance (a high reversible capacity of 1015 mA h g-1 after 100 cycles at a current density of 0.1 A g-1 and a high capacity of 805 mA h g-1 even at a high current density of 0...
November 23, 2017: Journal of Colloid and Interface Science
C Brouwers, H Merten, M Willems, D J Habraken, F W Bloemers, T H Biesheuvel, L S van Galen, P W B Nanayakkara, C Wagner
BACKGROUND: The proportion of older people needing acute care is rapidly growing, thereby posing an increased burden on the acute care chain. The aim of this study is to gain more insight into the obstacles and potential improvement opportunities of the acute care process for older patients arriving at the hospital. METHODS: Semi-structured interviews were conducted to determine the experiences of 18 different primary (i.e. general practitioner, community nurse) and secondary healthcare professionals (i...
October 2017: Netherlands Journal of Medicine
Hanting Tang, Jinlong Yang, Guangxing Zhang, Chaokun Liu, Han Wang, Qinghe Zhao, Jiangtao Hu, Yandong Duan, Feng Pan
Functional porous carbon materials are widely used to solve the low conductivity and shuttle effect of Li-S batteries; however, the common carbon/sulfur composite electrodes based on traditional technology (with conducting agents and binders) make it difficult for a battery to work stably at an ultra-high sulfur loading of 10 mg cm-2. Herein, an appropriate content of sulfur was injected into a pomegranate-like structure self-assembled with nanohollows (PSSN) of N-graphene. The Li-PSSN/S battery based on traditional technology displays a large-capacity, high-rate and long-life at an ultra-high areal-sulfur loading of 10...
December 8, 2017: Nanoscale
Kui Xu, Zifeng Lin, Céline Merlet, Pierre-Louis Taberna, Ling Miao, Jianjun Jiang, Patrice Simon
We present a molecular dynamics simulation study achieved on two-dimensional (2D) Ti3C2Tx MXenes in an [EMIM]+[TFSI]- ionic liquid electrolyte. Our simulations reproduce the different patterns of volumetric change observed experimentally for both the negative and positive electrodes. The analysis of ionic fluxes and structure rearrangements in the 2D material provide an atomic scale insight into the charge and discharge processes in the layer pore and confirm the existence of two different charge storage mechanisms at the negative and positive electrodes...
December 6, 2017: ChemSusChem
Jingzhi Hu, Tong Li, Bingqing Wei
The electrochemical-mechanical coupling property of solid electrolyte membranes is critical to improving the performance of solid-state energy storage devices. A new phenomenon was observed that the electrochemical charge-discharge process induced aligned wrinkles on the edge of PVA-H2SO4 gel polymer electrolytes (GPEs), which is attributed to the deformation of polymer chains under electrochemical stimulation according to multiscale simulations. In the reversed direction, by means of modeling and testing, it was proved that the ionic conductivity of GPE can be tuned by mediating the mechanical properties of GPEs via tailoring the polymer at the nanoscale...
December 6, 2017: Journal of Physical Chemistry Letters
Yingqian Chen, Johann Lüder, Man-Fai Ng, Michael Sullivan, Sergei Manzhos
We present the first atomistic-scale simulation of the discharge process of polymeric cathode materials for electrochemical batteries in solid state. The oxidation of polyaniline (PANI) and of cyano groups (CN) functionalized PANI induced by coordination to the electrolyte anions is computed and voltage curves are estimated. To deal with the large required numbers of atoms and structures, a combination of molecular dynamics and density functional tight binding (DFTB) is used. The DFTB is benchmarked to density functional theory (DFT) calculations using different functionals to confirm its accuracy...
December 4, 2017: Physical Chemistry Chemical Physics: PCCP
Ruixue Sun, Guangyin Liu, Shuzhi Cao, Bitao Dong, Xiaodi Liu, Min Hu, Miao Liu, Xinying Duan
We report the synthesis and application of ordered mesoporous TiNb6O17 microspheres (M-TNO) using a one-step solvothermal method for the first time in lithium-ion batteries. The diameters of TiNb6O17 microspheres are in the range from 2.2 to 2.4 μm with a mesopore size of about 35 nm, which promotes the electron and ion migration in charge/discharge processes. M-TNO shows a high specific capacitance (307.2 mA h g-1) at a low current density of 0.2 C and a long-term cycle life over 500 cycles as an electrode...
November 30, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Jian Tan, Dongna Liu, Xu Xu, Liqiang Mai
Rechargeable lithium-sulfur (Li-S) batteries have recently attracted global research interest due to their high theoretical specific capacity and energy density. To improve the performance and cycling stability of Li-S batteries, a clear understanding of the electrochemical reaction process and the degradation mechanisms of the sulfur redox chemistry are extremely important. In the past few decades, various advanced in situ/operando characterization tools have emerged, which have facilitated the understanding of the degradation mechanisms and the further development of high-performance Li-S batteries...
November 29, 2017: Nanoscale
Jun Liu, Jiadong Shen, Zhengbo Liu, Renzong Hu, Jiangwen Liu, Min Zhu
The sulfur cathode, as a new generation of lithium-ion battery cathode material, has a high theoretical energy density of ~2500 Wh kg-1. However, the low conductivity of sulfur and the "shuttle effect", widely presenting in the lithiation/de-lithiation process, seriously hinder its practical application. Herein, we report a new nanoconfined oxidation route (first complete oxidation of metal sulfide and subsequently partial oxidation of the generated S from sulfide) for S cathode encapsulated with MnO2 nanosheets and N-doped carbon hollow spheres...
November 27, 2017: Chemistry: a European Journal
Joo-Hyung Kim, Young Hwa Jung, Jong Hyuk Yun, P Ragupathy, Do Kyung Kim
To date, the possible depletion of lithium resources has become relevant, giving rise to the interest in Na-ion batteries (NIBs) as promising alternatives to Li-ion batteries. While extensive investigations have examined various transition metal oxides and chalcogenides as anode materials for NIBs, few of these have been able to utilize their high specific capacity in sodium-based systems because of their irreversibility in a charge/discharge process. Here, the mixed Sn-S nanocomposites uniformly distributed on reduced graphene oxide are prepared via a facile hydrothermal synthesis and a unique carbothermal reduction process, producing ultrafine nanoparticle with the size of 2 nm...
November 24, 2017: Small
Xiaoqiao Chen, Zhiguang Cao, Lidan Xing, Youhao Liao, Yongcai Qiu, Weishan Li
In this paper, MnO2 nanoboxes coated with poly(3,4-ethylenedioxythiophene) film (denoted as MnO2@PEDOT) are investigated as an anode material in lithium-ion batteries. The MnO2 nanoboxes are developed through the surface chemical oxidation decomposition of MnCO3 cubes and the subsequent removal of their remaining cores. PEDOT is coated on the surface of MnO2 nanoboxes via in situ polymerization of 3,4-ethylenedioxythiophene. The charge-discharge tests demonstrate that this special configuration endows the resulting MnO2@PEDOT with remarkable electrochemical performances, that is a reversible capacity of 628 mA h g(-1) after 850 cycles at a current density of 1000 mA g(-1) and a rate capacity of 367 mA h g(-1) at 3000 mA g(-1)...
November 21, 2017: Nanoscale
Yan Wang, Zhen-Yu He, Yao-Xuan Wang, Cong Fan, Chen-Ren-Lang Liu, Qi-Ling Peng, Jin-Ju Chen, Zhe-Sheng Feng
In this work, a free-standing flexible composite electrode was prepared by vacuum filtration method with LiFePO4, graphene and nanofibrillated cellulose (NFC). Compared with the pure LiFePO4 electrode, the resulting flexible composite (LiFePO4/graphene/NFC) electrode showed excellent mechanical flexibility, and possessed an enhanced initial discharge capacity of 151 mA h/g (0.1 C) and a good capacity retention rate with only 5% loss after 60 cycles due to suitable electrolyte wettability at the interface...
October 12, 2017: Journal of Colloid and Interface Science
Lijun Ren, Gaini Zhang, Ji Lei, Yan Wang, Dengwei Hu
It is a challenge to fabricate polyaniline (PANI) materials with high rate performance and excellent stability. Herein a new special supercapacitor electrode material of polyaniline-poly(hydroquinone)/graphene (PANI-PHQ/RGO) film with layered structure was prepared by chemical oxidative polymerization of aniline and hydroquinone (H2Q) in the presence of RGO hydrogel film. The synergistic effect and loose layered structure of the composite film facilitate fast diffusion and transportation of electrolyte ions through unimpeded channels during rapid charge-discharge process, resulting in high rate capability and stable cycling performance...
October 18, 2017: Journal of Colloid and Interface Science
Linxia Fang, Yan Qiu, Wen Li, Fan Wang, Mengdi Lan, Kejing Huang, Qiangshan Jing
A novel three-dimensional (3D) flower-like MoS2-CoSe2 heterostructure has been designed and synthesized by a facile two-step hydrothermal process as the electrode materials for supercapacitors. The MoS2-CoSe2 heterostructure is demonstrated to deliver a high specific capacitance (2577 F g(-1) at 1 A g(-1)) and remarkable rate capability (896 F g(-1) at 20 A g(-1)). Besides, the MoS2-CoSe2 electrode also exhibits excellent cycling stability of 91.03% capacitance retention after 5000 cycles even at a relatively high current density of 20 A g(-1)...
October 19, 2017: Journal of Colloid and Interface Science
Gillian Stockwell-Smith, Wendy Moyle, Andrea P Marshall, Alison Argo, Laura Brown, Shelley Howe, Keith Layton, Ornissa Naidoo, Yuwati Santoso, Elizabeth Soleil-Moudiky-Joh, Laurie Grealish
PURPOSE OF THE STUDY: Hospital discharge can be particularly challenging for older people with dementia. To assist in the development of bespoke discharge processes that address the unique needs of older people with dementia, an integrated review of the literature was undertaken. AIMS AND OBJECTIVES: The aim of the review was to identify barriers and facilitators to engagement of people with dementia and family carers in planning for discharge from hospital. DESIGN AND METHODS: A four-stage integrative review framework guided the review...
October 27, 2017: Journal of Clinical Nursing
Yuewen Liu, Ahmad Hassan Siddique, Heran Huang, Qile Fang, Wei Deng, Xufeng Zhou, Huanming Lu, Zhaoping Liu
A new conductive carbon hybrid combining both reduced graphene nanoscrolls and carbon nanotubes (rGNSs-CNTs) is prepared, and used to host Fe3O4 nanoparticles through an in situ synthesis method. As an anode material for LIBs, the obtained Fe3O4@rGNSs-CNTs shows good electrochemical performance. At a current density of 0.1 A g(-1), the anode material shows a high reversible capacity of 1232.9 mAh g(-1) after 100 cycles. Even at a current density of 1 A g(-1), it still achieves a high reversible capacity of 812...
October 23, 2017: Nanotechnology
Chelsea Leonard, Emily Lawrence, Marina McCreight, Brandi Lippmann, Lynette Kelley, Ashlea Mayberry, Amy Ladebue, Heather Gilmartin, Murray J Côté, Jacqueline Jones, Borsika A Rabin, P Michael Ho, Robert Burke
BACKGROUND: Adapting promising health care interventions to local settings is a critical component in the dissemination and implementation process. The Veterans Health Administration (VHA) rural transitions nurse program (TNP) is a nurse-led, Veteran-centered intervention designed to improve transitional care for rural Veterans funded by VA national offices for dissemination to other VA sites serving a predominantly rural Veteran population. Here, we describe our novel approach to the implementation and evaluation = the TNP...
October 23, 2017: Implementation Science: IS
Wei Wang, Peihao Li, Henry Zheng, Qiao Liu, Fan Lv, Jiandong Wu, Hao Wang, Shaojun Guo
2D electrode materials with layered structures have shown huge potential in the fields of lithium- and sodium-ion batteries. However, their poor conductivity limits the rate performance and cycle stability of batteries. Herein a new colloid chemistry strategy is reported for making 2D ultrathin layered SnSe nanoplates (SnSe NPs) for achieving more efficient alkali-ion batteries. Due to the effect of weak Van der Waals forces, each semiconductive SnSe nanoplate stacks on top of each other, which can facilitate the ion transfer and accommodate volume expansion during the charge and discharge process...
October 23, 2017: Small
A Harun, Andrew Y Finlay, M Sam Salek, Vincent Piguet
BACKGROUND/AIMS: The decision to discharge is a critical and common outpatient consultation event. However, little guidance exists over how discharge decision-making can be taught. We aimed to provide educational recommendations concerning outpatient discharge decision-making. METHODS: Recommendations were drawn from prior interviews with 40 consultant dermatologists and 56 dermatology outpatients, and from the "traffic light" design discharge information checklist, developed using the Delphi technique...
October 10, 2017: Dermatology: International Journal for Clinical and Investigative Dermatology
Yinxiang Zeng, Yue Meng, Zhengzhe Lai, Xiyue Zhang, Minghao Yu, Pingping Fang, Mingmei Wu, Yexiang Tong, Xihong Lu
Currently, the main bottleneck for the widespread application of Ni-Zn batteries is their poor cycling stability as a result of the irreversibility of the Ni-based cathode and dendrite formation of the Zn anode during the charging-discharging processes. Herein, a highly rechargeable, flexible, fiber-shaped Ni-Zn battery with impressive electrochemical performance is rationally demonstrated by employing Ni-NiO heterostructured nanosheets as the cathode. Benefiting from the improved conductivity and enhanced electroactivity of the Ni-NiO heterojunction nanosheet cathode, the as-fabricated fiber-shaped Ni-NiO//Zn battery displays high capacity and admirable rate capability...
October 9, 2017: Advanced Materials
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