Synergistic Combination of TiO2 and S-PAN for Li-S Batteries with Long-Term Cyclability at High C-Rates

2021 ◽  
Author(s):  
Ana Laura Paez Jerez ◽  
Lilian Davies ◽  
Alvaro Yamil Tesio ◽  
Victoria Flexer
Keyword(s):  
Elemental Sulfur ◽  
Active Material ◽  
High Capacity ◽  
Cycling Performance ◽  
Inert Atmosphere ◽  
Heating Process ◽  
The Novel ◽  
Metallic Oxide ◽  
Remaining Capacity

Abstract A ternary compound was synthesized from titanium dioxide, elemental sulfur and polyacrylonitrile throughout a simple ball-milling and heating process in inert atmosphere, and was fully characterized. The novel compound belongs to the family of sulfurized polyacrylonitrile compounds (SPAN) and was incorporated as active material in the cathode of Li-S batteries. The cells achieve high and stable capacity values at 0.5 C reaching 1885 mAh/gS for the 10th cycle and ~1600 mAh/gS after 200 cycles (498 and 422 mAh/g composite, respectively). To the best of our knowledge, we are the first to report the combination of SPAN and TiO2, and to show the synergistic behaviour of these compounds. The high capacity values observed, higher than the theoretical capacity of elemental sulfur (1675 mAh/g), are explained by the extra capacity provided by the lithiation/delithiation process of TiO2. The metallic oxide also improves the overall kinetics of the redox processes in SPAN, which helped to achieve good cycling performance at 3.3 C, with a remaining capacity of 672 mAh/gS after 1400 cycles, and even at 5 C where a remaining capacity of 660 mAh/gS after 500 cycles was recorded.

scholarly journals A High-Capacity Ammonium Vanadate Cathode for Zinc-Ion Battery

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Qifei Li ◽  
Xianhong Rui ◽  
Dong Chen ◽  
Yuezhan Feng ◽  
Ni Xiao ◽  
...  
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
High Capacity ◽  
Cycling Performance ◽  
Zinc Ion ◽  
First Principles Calculations ◽  
Diffusion Channel ◽  
Ion Storage ◽  
Ion Intercalation

AbstractGiven the advantages of being abundant in resources, environmental benign and highly safe, rechargeable zinc-ion batteries (ZIBs) enter the global spotlight for their potential utilization in large-scale energy storage. Despite their preliminary success, zinc-ion storage that is able to deliver capacity > 400 mAh g−1 remains a great challenge. Here, we demonstrate the viability of NH4V4O10 (NVO) as high-capacity cathode that breaks through the bottleneck of ZIBs in limited capacity. The first-principles calculations reveal that layered NVO is a good host to provide fast Zn2+ ions diffusion channel along its [010] direction in the interlayer space. On the other hand, to further enhance Zn2+ ion intercalation kinetics and long-term cycling stability, a three-dimensional (3D) flower-like architecture that is self-assembled by NVO nanobelts (3D-NVO) is rationally designed and fabricated through a microwave-assisted hydrothermal method. As a result, such 3D-NVO cathode possesses high capacity (485 mAh g−1) and superior long-term cycling performance (3000 times) at 10 A g−1 (~ 50 s to full discharge/charge). Additionally, based on the excellent 3D-NVO cathode, a quasi-solid-state ZIB with capacity of 378 mAh g−1 is developed.

A Li4Ti5O12–rutile TiO2 nanocomposite with an excellent high rate cycling stability for lithium ion batteries

2015 ◽  
Vol 39 (6) ◽  
pp. 4430-4436 ◽  
Author(s):  
Xi-Ping Li ◽  
Jian Mao
Keyword(s):  
Lithium Ion Batteries ◽  
High Capacity ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Cycling Stability ◽  
High Rate ◽  
Rutile Tio2

Layer-stacked Li4Ti5O12–rutile TiO2 nanocomposite with high capacity and excellent long-term cycling performance at a high rate of 10 C.

Novel safer phosphonate-based gel polymer electrolytes for sodium-ion batteries with excellent cycling performance

2018 ◽  
Vol 6 (15) ◽  
pp. 6559-6564 ◽  
Author(s):  
Jinyun Zheng ◽  
Yanhong Zhao ◽  
Xiangming Feng ◽  
Weihua Chen ◽  
Yufen Zhao
Keyword(s):  
Polymer Electrolytes ◽  
High Capacity ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Gel Polymer Electrolytes

Phosphonate containing GPEs for safer sodium ion batteries with high capacity and stable long term cycling performance.

Concussion in sports in children and adolescents – to play or not to play?

2017 ◽  
Vol 65 (3) ◽  
Keyword(s):  
Gender Differences ◽  
Children And Adolescents ◽  
Return To Sport ◽  
Consensus Conference ◽  
Return To School ◽  
The Novel ◽  
International Consensus ◽  
Persistent Symptoms ◽  
New Findings

A lot has been published on the topic concussion in sports during the last years, conscience was sharpened, much was structured and defined more precisely, help tools were developed and rules changed. This article summarizes the fifth edition of the recently published guidelines of the “International Consensus Conference on Concussion in Sport”. In addition, new findings regarding gender differences and recovery will be presented, as well as the modified “return-to-sport” and the novel “return-to-school” protocols. Despite increased knowledge many questions remain such as the therapy of persistent symptoms or long-term sequelae of recurrent concussions.

scholarly journals Influence of material degradation on weld seam quality in hot gas butt welding of polyamides

2021 ◽  
Author(s):  
Max Bialaschik ◽  
Volker Schöppner ◽  
Mirko Albrecht ◽  
Michael Gehde
Keyword(s):  
Weld Seam ◽  
Experimental Investigations ◽  
Heating Process ◽  
Butt Welding ◽  
Hot Gas ◽  
Process Gas ◽  
Glass Fiber Reinforced ◽  
Extrusion Welding ◽  
Different Gases

AbstractThe joining of plastics is required because component geometries are severely restricted in conventional manufacturing processes such as injection molding or extrusion. In addition to established processes such as hot plate welding, infrared welding, or vibration welding, hot gas butt welding is becoming more and more important industrially due to its advantages. The main benefits are the contactless heating process, the suitability for glass fiber reinforced, and high-temperature plastics as well as complex component geometries. However, various degradation phenomena can occur during the heating process used for economic reasons, due to the presence of oxygen in the air and to the high gas temperatures. In addition, the current patent situation suggests that welding with an oxidizing gas is not permissible depending on the material. On the other hand, however, there is experience from extrusion welding, with which long-term resistant weld seams can be produced using air. Investigations have shown that the same weld seam properties can be achieved with polypropylene using either air or nitrogen as the process gas. Experimental investigations have now been carried out on the suitability of different gases with regard to the weld seam quality when welding polyamides, which are generally regarded as more prone to oxidation. The results show that weld strengths are higher when nitrogen is used as process gas. However, equal weld strengths can be achieved with air and nitrogen when the material contains heat stabilizers.

scholarly journals 458. Molecular SARS-CoV-2 Testing During the COVID-19 Outbreak: Experiences of a Hospital in Southeast Michigan, USA

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S296-S297
Author(s):  
Trini A Mathew ◽  
Jonathan Hopkins ◽  
Diane Kamerer ◽  
Shagufta N Ali ◽  
Daniel Ortiz ◽  
...  
Keyword(s):  
Clinical Features ◽  
Diagnostic Testing ◽  
Beaumont Hospital ◽  
High Capacity ◽  
Turnaround Time ◽  
Molecular Diagnostic ◽  
The Novel ◽  
Repeat Testing ◽  
Asymptomatic Patients ◽  
Novel Coronavirus

Abstract Background The novel Coronavirus SARS CoV-2 (COVID-19) outbreak was complicated by the lack of diagnostic testing kits. In early March 2020, leadership at Beaumont Hospital, Royal Oak Michigan (Beaumont) identified the need to develop high capacity testing modalities with appropriate sensitivity and specificity and rapid turnaround time. We describe the molecular diagnostic testing experience since initial rollout on March 16, 2020 at Beaumont, and results of repeat testing during the peak of the COVID-19 pandemic in MI. Methods Beaumont is an 1100 bed hospital in Southeast MI. In March, testing was initially performed with the EUA Luminex NxTAG CoV Extended Panel until March 28, 2020 when testing was converted to the EUA Cepheid Xpert Xpress SARS-CoV-2 for quicker turnaround times. Each assay was validated with a combination of patient samples and contrived specimens. Results During the initial week of testing there was > 20 % specimen positivity. As the prevalence grew the positivity rate reached 68% by the end of March (Figure 1). Many state and hospital initiatives were implemented during the outbreak, including social distancing and screening of asymptomatic patients to increase case-finding and prevent transmission. We also adopted a process for clinical review of symptomatic patients who initially tested negative for SARS-CoV-2 by a group of infectious disease physicians (Figure 2). This process was expanded to include other trained clinicians who were redeployed from other departments in the hospital. Repeat testing was performed to allow consideration of discontinuation of isolation precautions. During the surge of community cases from March 16 to April 30, 2020, we identified patients with negative PCR tests who subsequently had repeat testing based on clinical evaluation, with 7.1% (39/551) returning positive for SARS- CoV2. Of the patients who expired due to COVID-19 during this period, 4.3% (9/206) initially tested negative before ultimately testing positive. Figure 1 BH RO testing Epicurve Figure 2: Screening tool for repeat COVID19 testing and precautions Conclusion Many state and hospital initiatives helped us flatten the curve for COVID-19. Our hospital testing experience indicate that repeat testing may be warranted for those patients with clinical features suggestive of COVID-19. We will further analyze these cases and clinical features that prompted repeat testing. Disclosures All Authors: No reported disclosures

scholarly journals Waning antibody responses in COVID-19: what can we learn from the analysis of other coronaviruses?

Infection ◽  
2021 ◽  
Author(s):  
Ali Hamady ◽  
JinJu Lee ◽  
Zuzanna A. Loboda
Keyword(s):  
Cross Reactivity ◽  
Antibody Responses ◽  
The Novel ◽  
Incidence And Mortality ◽  
Antibody Titres ◽  
Human Coronaviruses ◽  
Public Health Strategies ◽  
Antibody Dynamics

Abstract Objectives The coronavirus disease 2019 (COVID-19), caused by the novel betacoronavirus severe acute respiratory syndrome 2 (SARS-CoV-2), was declared a pandemic in March 2020. Due to the continuing surge in incidence and mortality globally, determining whether protective, long-term immunity develops after initial infection or vaccination has become critical. Methods/Results In this narrative review, we evaluate the latest understanding of antibody-mediated immunity to SARS-CoV-2 and to other coronaviruses (SARS-CoV, Middle East respiratory syndrome coronavirus and the four endemic human coronaviruses) in order to predict the consequences of antibody waning on long-term immunity against SARS-CoV-2. We summarise their antibody dynamics, including the potential effects of cross-reactivity and antibody waning on vaccination and other public health strategies. At present, based on our comparison with other coronaviruses we estimate that natural antibody-mediated protection for SARS-CoV-2 is likely to last for 1–2 years and therefore, if vaccine-induced antibodies follow a similar course, booster doses may be required. However, other factors such as memory B- and T-cells and new viral strains will also affect the duration of both natural and vaccine-mediated immunity. Conclusion Overall, antibody titres required for protection are yet to be established and inaccuracies of serological methods may be affecting this. We expect that with standardisation of serological testing and studies with longer follow-up, the implications of antibody waning will become clearer.

Influence of post-bonding heating process on the long-term reliability of Cu/Al contact

2021 ◽  
Vol 118 ◽  
pp. 114058
Author(s):  
Motoki Eto ◽  
Noritoshi Araki ◽  
Takashi Yamada ◽  
Masaaki Sugiyama ◽  
Shinji Fujimoto
Keyword(s):  
Heating Process
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