The slow redox kinetics and shuttling behavior of the intermediate lithium polysulfides constrain the further development of lithium-sulfur (Li-S) electrochemistry. A yolk-shell InS@void@carbon hybrid engineered to host the sulfur for Li-S batteries is prepared by using a multi-layered assembly method. The InS/electrolyte interface acted as powerful adsorption and activation sites for soluble polysulfides, which is demonstrated using density functional theory (DFT) calculations.
View Article and Find Full Text PDFSince current graphite-based lithium-ion battery anode has a low theoretical capacity, the development of high-performance lithium-ion battery is severely restricted. Here, novel hierarchical composites composing of microdisc and the secondarily grown nanosheets and nanowires are developed, taking NiMoOnanosheets and MnOnanowires growing on FeOmicrodiscs as demonstrating examples. The growth processes of the hierarchical structures have been investigated by adjusting a series of preparation conditions.
View Article and Find Full Text PDFMagnesium/lithium hybrid-ion batteries (MLHBs) combine the advantages of high safety and fast ionic kinetics, which enable them to be promising emerging energy-storage systems. Here, a high-performance MLHB using a modified all-phenyl complex with a lithium bis(trifluoromethanesulfonyl)imide electrolyte and a NiCoS cathode on a copper current collector is developed. A reversible conversion involving a copper collector with NiCoS efficiently avoids the electrolyte dissociation and diffusion difficulties of Mg ions, enabling low polarization and fast redox, which is verified by X-ray absorption near edge structure analysis.
View Article and Find Full Text PDFThe shuttling behavior and slow conversion kinetics of the intermediate lithium polysulfides are the severe obstacles for the application of lithium-sulfur (Li-S) batteries over a wide temperature range. Here, an engineered lamellar yolk-shell structure of In O @void@carbon for the Li-S battery cathode is developed for the first time to construct a powerful barrier that effectively inhibits the shuttling of polysulfides. On the basis of the unique nanochannel-containing morphology, the continuous kinetic transformation of sulfur and polysulfides is confined in a stable framework, which is demonstrated by using X-ray nanotomography.
View Article and Find Full Text PDFA novel hierarchical composite consisting of an ordered NiCo2O4 nanowire array growing on the lateral side of a Fe2O3 microdisc is presented, which was confirmed by X-ray holography technology on a synchrotron radiation station. The composite-based Li-ion battery anode exhibits a high capacity of 1528 mA h g-1 after 200 cycles at 0.2C, a recoverable rate-performance after repeated tests, and robust mechanical properties.
View Article and Find Full Text PDFHigh capacity and stable anodes are demanded since the current graphite-based anode does not meet the high-performance requirements of emerging Li-ion battery systems. Herein, we present a novel spring-shaped hierarchical SiO@CoO nanowire composite, which exhibits good Li-storage performance. The special structure is able to effectively accommodate the change in structure during charge-discharge, and the coaxial hierarchical morphology enables rapid Li ion and electron transfer.
View Article and Find Full Text PDFWei Sheng Yan Jiu
July 2015
Objective: To explore the effects of tyrosine oxidized products (TOP) on the redox state of rats myocardium and investigate the oxidative damage mechanism.
Methods: Male SD Rats were randomly assigned to three groups and treated respectively with normal diet (Group C), 440 mg/kg TOP (Group TOP), 440 mg/kg tyrosine oxidized products plus 5 mg/kg lipoic acid (Group TOP + LA). Indicators of oxidative stress in blood and myocardial were measured at the end of 6 weeks, 12 weeks and 24 weeks.