Selenium-Infused Ordered Mesoporous Carbon for Room-Temperature All-Solid-State Lithium-Selenium Batteries with Ultrastable Cyclability

\Selenium with a similar reaction mechanism with sulfur and a much higher electronic conductivity is considered to be a promising cathode for all-solid-state rechargeable batteries. Herein, selenium-infused ordered mesoporous carbon composites (Se/CMK-3) are successfully prepared by a melt-diffusion method from a ball-milled mixture of Se and CMK-3 (Se-CMK-3). Furthermore, their electrochemical performances are evaluated in all-solid-state lithium-selenium batteries at room temperature. Typically, Li/75%Li2S-24%P2S5-1%P2O5/Li10GeP2S12/Se/CMK-3 all-solid-state lithium-selenium batteries exhibit high reversible capacity of 488.7 mAh g(-1) at 0.05 C after 100 cycles. Even being cycled at 0.5C, it still maintains a discharge capacity of 268.7 mAh g(-1) after 200 cycles. The excellent electrochemical performances could be attributed to the enhanced electronic/ionic conductivities and structural integrity with the addition of the CMK-3 matrix

Bio-inspired Nanoscaled Electronic/Ionic Conduction Networks for Room-Temperature All-Solid-State Sodium-Sulfur Battery

Sulfur cathode with nano-scaled electronic/ionic network is essential for all-solid-state Na/S batteries to achieve high energy density and long cycle life. However, it is great challenged to fabricate such a structure using either mechanical milling or liquid-phase reaction method. Here, a S-Na3SbS4-C cathode with distributed micro-scaled primary electronic/ionic highways along with nano-scaled secondary local-roads is fabricated by combining the liquid-phase reaction and mechanical milling. The formation mechanism for nano-scaled local-roads in S-Na3SbS4-C is systematically investigated. The S-Na3SbS4-C nanocomposite cathode with 3D distributed primary and secondary ionic/electronic conduction network provides a high initial discharge capacity of 1504.3 mAh g(-1) at 50 mA g(-1) with Coulombic efficiency of 98.5% at room temperature. Meanwhile, S-Na3SbS4-C/Na cells also demonstrate excellent rate capability with capacities of 1386.3, 1324.1, 1150.8, 893.4, 825.6, 771.2 and 662.3 mAh g(-1) at current densities of 50, 100, 200, 300, 500, 1000 and 2000 mA g(-1), respectively. Even at ultrahigh cathode loading of 6.34 and 12.74 mg cm(-2), the S-Na3SbS4-C/Na cells can deliver reversible discharge specific capacities of 742.9 and 465.6 mAh g(-1) at 100 mA g(-1), respectively. S-Na3SbS4-C/Na cell represents one of the best rate performances for room-temperature all-solid-state sodium-sulfur batteries reported to date. This work provides a simple strategy to design mixed conductive composite cathode for high-performance room-temperature all-solid-state sodium-sulfur batteries. (C) 2020 Elsevier Ltd. All rights reserved

CNTs@S composite as cathode for all-solid-state lithium-sulfur batteries with ultralong cycle life

CNTs@S composite as cathode for all-solid-state lithium-sulfur batteries with ultralong cycle lif

Fe3S4@Li7P3S11 nanocomposites as cathode materials for all-solid-state lithium batteries with improved energy density and low cost

All-solid-state lithium batteries are considered as one of the most promising alternatives to traditional lithium-ion batteries because of their high safety and high energy density. In order to further improve the energy density of all-solid-state lithium batteries, sulfide electrodes with high theoretical capacities and solid electrolytes with high ionic conductivities have been widely explored and successfully demonstrated in all-solid-state lithium batteries. However, the interfacial resistance arising from poor interfacial compatibility and loose contact seriously hinders the electrochemical performances of all-solid-state lithium batteries. Fe3S4 ultrathin nanosheets with a thickness of 15 nm are synthesized by a facile polyvinyl alcohol-assisted precipitation method. In order to achieve intimate contact between sulfide electrodes and sulfide solid electrolytes, Fe3S4 nanosheets are in situ coated with Li7P3S11 and employed as cathode materials in Li/75% Li2S-24% P2S5-1% P2O5/Li10GeP2S12/Fe3S4@Li7P3S11 all-solid-state lithium batteries to investigate their electrochemical performances. Fe3S4@Li7P3S11 nanocomposite electrodes exhibit higher discharge capacity and better rate capability than pristine Fe3S4 nanosheets. After 200 cycles, the discharge capacity remained at a high value of 1001 mA h g(-1) at a current density of 0.1 A g(-1). The superior cycling stability could be ascribed to intimate contact and low charge transfer resistance at the interface between electrodes and solid electrolytes

Cobalt-doped pyrite for Na11Sn2SbS11.5Se0.5 electrolyte based all-solid-state sodium battery with enhanced capacity

The ionic conductivity and electrochemical stability of the electrolyte layer as well as the capacity of cathode material play pivotal roles for enhancing the electrochemical performances of all-solid-state sodium batteries. Herein, Na11Sn2SbS11.5Se0.5 solid electrolyte with ionic conductivity of 6.6 x 10(-4) S cm(-1) is synthesized. Meanwhile, Na11Sn2SbS11.5Se0.5-Na3PS4 electrolyte bilayer is employed to address the unstability of Na11Sn2SbS11.5Se0.5 against sodium. Moreover, the optimized Co0.1Fe0.9S2 is used as cathode to further improve the capacity of the all-solid-state sodium batteries. Thus, the as-generated Co0.1Fe0.9S2/Na11Sn2SbS11.5Se0.5Na3PS4/Na all-solid-state sodium battery exhibits high reversible capacity of 383.5 mAh g(-1) after cycling at 20 mA g(-1) for 30 cycles, enhanced rate capability with capacities of 454.6, 405.3, 256.6 and 115.7 mAh g(-1) at 20, 50, 100 and 200 mA g(-1) after the first activation cycle, respectively, and improved high rate cycling stability with capacity of 159.8 mAh g(-1) after cycling at 100 mA g(-1) for 100 cycles

SaaS sRNA promotes Salmonella intestinal invasion via modulating MAPK inflammatory pathway

ABSTRACTSalmonella Enteritidis is a foodborne enteric pathogen that infects humans and animals, utilizing complex survival strategies. Bacterial small RNA (sRNA) plays an important role in these strategies. However, the virulence regulatory network of S. Enteritidis remains largely incomplete and knowledge of gut virulence mechanisms of sRNAs is limited. Here, we characterized the function of a previously identified Salmonella adhesive-associated sRNA (SaaS) in the intestinal pathogenesis of S. Enteritidis. We found that SaaS promoted bacterial colonization in both cecum and colon of a BALB/c mouse model; it was preferentially expressed in colon. Moreover, our results showed that SaaS enhanced damage to mucosal barrier by affecting expressions of antimicrobial products, decreasing the number of goblet cells, suppressing mucin gene expression, and eventually reducing thickness of mucus layer; it further breached below physical barrier by strengthening invasion into epithelial cells in Caco-2 cell model as well as decreasing tight junction expressions. High throughput 16S rRNA gene sequencing revealed that SaaS also altered gut homeostasis by depleting beneficial gut microbiota while increasing harmful ones. Furthermore, by employing ELISA and western blot analysis, we demonstrated that SaaS regulated intestinal inflammation through sequential activation P38-JNK-ERK MAPK signaling pathway, which enabled immune escape at primary infection stage but strengthened pathogenesis at later stage, respectively. These findings suggest that SaaS plays an essential role in the virulence of S. Enteritidis and reveals its biological role in intestinal pathogenesis

Co3S4@Li7P3S11 Hexagonal Platelets as Cathodes with Superior Interfacial Contact for All-Solid-State Lithium Batteries

Poor solid-solid contact between an electrode and solid electrolyte is a great challenge for all-solid-state lithium batteries (ASSLBs) which results in limited ion transport and eventually leads to rapid capacity fading. Twodimensional (2D) materials have incomparable advantage in the construction of the desired interface because of their flat surface and large specific surface area. In order to realize intimate interfacial contact and superior ion transport, monodisperse 2D Co3S4 hexagonal platelets as cathodes for all ASSLBs are synthesized through a series of topological reactions followed with in situ coating of tiny Li7P3S11 using a liquid-phase method. The unique 2D hexagonal platelets are favorable for in situ solid electrolyte coating. Moreover, the well-designed interfacial structure can make the electrode materials contact with solid electrolytes more closely, contributing to a remarkable improvement on electrochemical performance. ASSLBs employing the Co3S4@Li7P3S11 composite platelets as a cathode deliver a large reversible capacity of 685.9 mA h g(-1) at 0.5 A g(-1) for 50 cycles. Even at a high current density of 1 A g(-1), the Co3S4@Li7P3S11 composite cathode still exhibits a high capacity of 457.3 mA h g(-1) after 100 cycles. This work provides a simple strategy to design the composite electrode with intimate contact and superior ion transport via morphology controlling

Construction of 3D Electronic/Ionic Conduction Networks for All-Solid-State Lithium Batteries

Construction of 3D Electronic/Ionic Conduction Networks for All-Solid-State Lithium Batterie

Highly Crystalline Layered VS2. Nanosheets for All-Solid-State Lithium Batteries with Enhanced Electrochemical Performances

All-solid-state lithium batteries employing inorganic solid electrolytes have been regarded as an ultimate solution to safety issues because of their features of no leakage as well as incombustibility and they are expected to achieve higher energy densities owing to their simplified structure. Two-dimensional transition-metal dichalcogenides exhibit a great potential in energy storage devices because of their unique physical and chemical characteristics. In this work, 50 nm thick highly crystalline layered VS2 (hc-VS2) nanosheets are prepared by a solvothermal method, and their electrochemical performances are evaluated in Li/75% Li2S-24% P2S5-1% P2O5/Li10GeP2S12/hc-VS2 all-solid-state lithium batteries. At 50 mA g(-1),he-VS2 nanosheets show a high reversible capacity of 532.2 mAh g(-1) after 30 cycles. Moreover, stable discharge capacities are maintained at 436.8 and 270.4 mAh g(-1) at 100 and 500 mA after 100 cycles, respectively. The superior rate capability and cycling stability are ascribed to the better electronic conductivity and well-developed layered structure. In addition, the electrochemical reaction kinetics and capacity contributions were analyzed via cyclic voltammetry measurements at different scan rates