The Experts below are selected from a list of 993 Experts worldwide ranked by ideXlab platform
Kong Xueqian - One of the best experts on this subject based on the ideXlab platform.
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Revealing the chemistry of an anode-Passivating Electrolyte salt for high rate and stable sodium metal batteries
'Royal Society of Chemistry (RSC)', 2018Co-Authors: Gao Lina, Chen Juner, Liu Yaqin, Yamauchi Yusuke, Huang Zhenguo, Kong XueqianAbstract:Stabilizing the reactive metal anode is a critical challenge for the development of next-generation alkali metal batteries. This work demonstrates that sodium-difluoro(oxalato)borate (NaDFOB)-based carbonate-ester Electrolytes have excellent compatibility with the anode in sodium metal batteries, enabling high rate performance and long cycle life. The NaDFOB-based Electrolytes possess favourable electrochemical stability and effectively passivate the Na metal anode by forming a compact, robust and conductive solid-Electrolyte interphase (SEI) layer. Quantitative nuclear magnetic resonance (NMR) measurements of Electrolyte solvents indicated that the SEI layer forms mainly in the initial cycles, and it prevents further solvent degradation. Solid-state NMR and X-ray photoelectron spectroscopy studies revealed the chemical composition of the NaDFOB-derived SEI film, which includes a mixed phase consisting primarily of sodium diborate, tetrafluoroborate and carbonate. The formation of such a composite SEI rich in borate and tetrafluoroborate provides robust structural and chemical stability, and facilitates fast ion transport for uniform Na stripping/plating
Kong X - One of the best experts on this subject based on the ideXlab platform.
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Revealing the chemistry of an anode-Passivating Electrolyte salt for high rate and stable sodium metal batteries
'Royal Society of Chemistry (RSC)', 2018Co-Authors: Gao L, Chen J, Liu Y, Yamauchi Y, Huang Z, Kong XAbstract:© The Royal Society of Chemistry 2018. Stabilizing the reactive metal anode is a critical challenge for the development of next-generation alkali metal batteries. This work demonstrates that sodium-difluoro(oxalato)borate (NaDFOB)-based carbonate-ester Electrolytes have excellent compatibility with the anode in sodium metal batteries, enabling high rate performance and long cycle life. The NaDFOB-based Electrolytes possess favourable electrochemical stability and effectively passivate the Na metal anode by forming a compact, robust and conductive solid-Electrolyte interphase (SEI) layer. Quantitative nuclear magnetic resonance (NMR) measurements of Electrolyte solvents indicated that the SEI layer forms mainly in the initial cycles, and it prevents further solvent degradation. Solid-state NMR and X-ray photoelectron spectroscopy studies revealed the chemical composition of the NaDFOB-derived SEI film, which includes a mixed phase consisting primarily of sodium diborate, tetrafluoroborate and carbonate. The formation of such a composite SEI rich in borate and tetrafluoroborate provides robust structural and chemical stability, and facilitates fast ion transport for uniform Na stripping/plating
Gao Lina - One of the best experts on this subject based on the ideXlab platform.
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Revealing the chemistry of an anode-Passivating Electrolyte salt for high rate and stable sodium metal batteries
'Royal Society of Chemistry (RSC)', 2018Co-Authors: Gao Lina, Chen Juner, Liu Yaqin, Yamauchi Yusuke, Huang Zhenguo, Kong XueqianAbstract:Stabilizing the reactive metal anode is a critical challenge for the development of next-generation alkali metal batteries. This work demonstrates that sodium-difluoro(oxalato)borate (NaDFOB)-based carbonate-ester Electrolytes have excellent compatibility with the anode in sodium metal batteries, enabling high rate performance and long cycle life. The NaDFOB-based Electrolytes possess favourable electrochemical stability and effectively passivate the Na metal anode by forming a compact, robust and conductive solid-Electrolyte interphase (SEI) layer. Quantitative nuclear magnetic resonance (NMR) measurements of Electrolyte solvents indicated that the SEI layer forms mainly in the initial cycles, and it prevents further solvent degradation. Solid-state NMR and X-ray photoelectron spectroscopy studies revealed the chemical composition of the NaDFOB-derived SEI film, which includes a mixed phase consisting primarily of sodium diborate, tetrafluoroborate and carbonate. The formation of such a composite SEI rich in borate and tetrafluoroborate provides robust structural and chemical stability, and facilitates fast ion transport for uniform Na stripping/plating
Gao L - One of the best experts on this subject based on the ideXlab platform.
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Revealing the chemistry of an anode-Passivating Electrolyte salt for high rate and stable sodium metal batteries
'Royal Society of Chemistry (RSC)', 2018Co-Authors: Gao L, Chen J, Liu Y, Yamauchi Y, Huang Z, Kong XAbstract:© The Royal Society of Chemistry 2018. Stabilizing the reactive metal anode is a critical challenge for the development of next-generation alkali metal batteries. This work demonstrates that sodium-difluoro(oxalato)borate (NaDFOB)-based carbonate-ester Electrolytes have excellent compatibility with the anode in sodium metal batteries, enabling high rate performance and long cycle life. The NaDFOB-based Electrolytes possess favourable electrochemical stability and effectively passivate the Na metal anode by forming a compact, robust and conductive solid-Electrolyte interphase (SEI) layer. Quantitative nuclear magnetic resonance (NMR) measurements of Electrolyte solvents indicated that the SEI layer forms mainly in the initial cycles, and it prevents further solvent degradation. Solid-state NMR and X-ray photoelectron spectroscopy studies revealed the chemical composition of the NaDFOB-derived SEI film, which includes a mixed phase consisting primarily of sodium diborate, tetrafluoroborate and carbonate. The formation of such a composite SEI rich in borate and tetrafluoroborate provides robust structural and chemical stability, and facilitates fast ion transport for uniform Na stripping/plating
S J Dowey - One of the best experts on this subject based on the ideXlab platform.
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Plasma electrolysis for surface engineering
Surface and Coatings Technology, 1999Co-Authors: A L Yerokhin, X Nie, Allan Matthews, Adrian Leyland, S J DoweyAbstract:This paper overviews the relatively new surface engineering discipline of plasma electrolysis, the main derivative of this being plasma electrolytic deposition (PED), which includes techniques such as plasma electrolytic oxidation (PEO) and plasma electrolytic saturation (PES) processes such as plasma electrolytic nitriding/carburizing (PEN/PEC). In PED technology, spark or arc plasma micro-discharges in an aqueous solution are utilised to ionise gaseous media from the solution such that complex compounds are synthesised on the metal surface through the plasma chemical interactions. The physical and chemical fundamentals of plasma electrolysis are discussed here. The equipment and deposition procedures for coating production are described, and the effects of Electrolyte composition and temperature on ignition voltage, discharge intensity and deposited layer thickness and composition are outlined. AC-pulse PEO treatment of aluminium in a suitable Passivating Electrolyte allows the formation of relatively thick (up to 500 μm) and hard (up to 23 GPa) surface layers with excellent adhesion to the substrate. A 10-20 μm thick surface compound layer (1200HV) and 200-300 μm inner diffusion layer with very good mechanical and corrosion-resistant properties can also be formed on steel substrates in only 3-5 min by use of the PEN/PEC saturation techniques. Details are given of the basic operational characteristics of the various techniques, and the physical, mechanical and tribological characteristics of coatings produced by plasma electrolytic treatments are presented.