The Experts below are selected from a list of 24000 Experts worldwide ranked by ideXlab platform
Takashi Kyotani - One of the best experts on this subject based on the ideXlab platform.
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Li-Rich Li-Si Alloy As A Lithium-Containing Negative Electrode Material Towards High Energy Lithium-Ion Batteries
Scientific Reports, 2015Co-Authors: Shinichiroh Iwamura, Yoshitaka Ono, Haruhiko Morito, Hiroki Nara, Hirotomo Nishihara, Hisanori Yamane, Tetsuya Osaka, Takashi KyotaniAbstract:Lithium-ion batteries (LIBs) are generally constructed by lithium-including positive Electrode materials, such as LiCoO2, and lithium-free Negative Electrode materials, such as graphite. Recently, lithium-free positive Electrode materials, such as sulfur, are gathering great attention from their very high capacities, thereby significantly increasing the energy density of LIBs. Though the lithium-free materials need to be combined with lithium-containing Negative Electrode materials, the latter has not been well developed yet. In this work, the feasibility of Li-rich Li-Si alloy is examined as a lithium-containing Negative Electrode material. Li-rich Li-Si alloy is prepared by the melt-solidification of Li and Si metals with the composition of Li21Si5. By repeating delithiation/lithiation cycles, Li-Si particles turn into porous structure, whereas the original particle size remains unchanged. Since Li-Si is free from severe constriction/expansion upon delithiation/lithiation, it shows much better cyclability than Si. The feasibility of the Li-Si alloy is further examined by constructing a full-cell together with a lithium-free positive Electrode. Though Li-Si alloy is too active to be mixed with binder polymers, the coating with carbon-black powder by physical mixing is found to prevent the undesirable reactions of Li-Si alloy with binder polymers, and thus enables the construction of a more practical electrochemical cell.
Lorenzo Stievano - One of the best experts on this subject based on the ideXlab platform.
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Snapshot on Negative Electrode Materials for Potassium-Ion Batteries
Frontiers in Energy Research, 2019Co-Authors: Vincent Gabaudan, Laure Monconduit, Lorenzo Stievano, Romain BerthelotAbstract:Potassium-based batteries have recently emerged as a promising alternative to lithium-ion batteries. The very low potential of the K + /K redox couple together with the high mobility of K + in electrolytes resulting from its weak Lewis acidity should provide high energy density systems operating with fast kinetics. However, potassium metal cannot be implemented in commercial batteries due to its high reactivity. As safety is one of the major concerns when developing new types of batteries, it is therefore crucial to look for materials alternative to potassium metal that electrochemically insert K + at low potential. Here, the different types of Negative Electrode materials highlighted in many recent reports will be presented in detail. As a cornerstone of viable potassium-ion batteries, the choice of the electrolyte will be addressed as it directly impacts the cycling performance. Lastly, guidelines to a rational design of sustainable and efficient Negative Electrode materials will be proposed as open perspectives.
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transition metal carbodiimides as molecular Negative Electrode materials for lithium and sodium ion batteries with excellent cycling properties
ChemInform, 2016Co-Authors: Moulay Tahar Sougrati, Laure Monconduit, Ali Darwiche, Abdelfattah Mahmoud, Raphael P Hermann, Samuel Jouen, Richard Dronskowski, Lorenzo StievanoAbstract:FeNCN can be efficiently used as Negative Electrode material for alkali metal ion batteries.
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transition metal carbodiimides as molecular Negative Electrode materials for lithium and sodium ion batteries with excellent cycling properties
Angewandte Chemie, 2016Co-Authors: Moulay Tahar Sougrati, Laure Monconduit, Ali Darwiche, Abdelfattah Mahmoud, Raphael P Hermann, Samuel Jouen, Richard Dronskowski, Lorenzo StievanoAbstract:We report evidence for the electrochemical activity of transition-metal carbodiimides versus lithium and sodium. In particular, iron carbodiimide, FeNCN, can be efficiently used as Negative Electrode material for alkali-metal-ion batteries, similar to its oxide analogue FeO. Based on 57Fe Mossbauer and infrared spectroscopy (IR) data, the electrochemical reaction mechanism can be explained by the reversible transformation of the Fe−NCN into Li/Na−NCN bonds during discharge and charge. These new Electrode materials exhibit higher capacity compared to well-established Negative Electrode references such as graphite or hard carbon. Contrary to its oxide analogue, iron carbodiimide does not require heavy treatments (such as nanoscale tailoring, sophisticated textures, or coating) to obtain long cycle life with current density as high as 9 A g−1 for hundreds of charge–discharge cycles. Similar to the iron compound, several other transition-metal carbodiimides Mx(NCN)y with M=Mn, Cr, Zn can cycle successfully versus lithium and sodium. Their electrochemical activity and performance open the way to the design of a novel family of anode materials.
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facile synthesis and long cycle life of snsb as Negative Electrode material for na ion batteries
Electrochemistry Communications, 2013Co-Authors: Ali Darwiche, Moulay Tahar Sougrati, Lorenzo Stievano, Bernard Fraisse, Laure MonconduitAbstract:Abstract We report significant electrochemical performances promoting SnSb as one of the most promising Negative Electrode material for rechargeable batteries. Appropriately formulated with the carboxymethyl cellulose binder and cycled in fluoroethylene carbonate containing electrolyte, it could sustain a reversible capacity largely exceeding 525 mAh g − 1 over more than 125 cycles at a rate of C/2 (55 mA/g), with a satisfactory coulombic efficiency of more than 97%. To our knowledge, this is actually the longest cycle life ever reported for an Electrode material vs. sodium.
Laure Monconduit - One of the best experts on this subject based on the ideXlab platform.
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Snapshot on Negative Electrode Materials for Potassium-Ion Batteries
Frontiers in Energy Research, 2019Co-Authors: Vincent Gabaudan, Laure Monconduit, Lorenzo Stievano, Romain BerthelotAbstract:Potassium-based batteries have recently emerged as a promising alternative to lithium-ion batteries. The very low potential of the K + /K redox couple together with the high mobility of K + in electrolytes resulting from its weak Lewis acidity should provide high energy density systems operating with fast kinetics. However, potassium metal cannot be implemented in commercial batteries due to its high reactivity. As safety is one of the major concerns when developing new types of batteries, it is therefore crucial to look for materials alternative to potassium metal that electrochemically insert K + at low potential. Here, the different types of Negative Electrode materials highlighted in many recent reports will be presented in detail. As a cornerstone of viable potassium-ion batteries, the choice of the electrolyte will be addressed as it directly impacts the cycling performance. Lastly, guidelines to a rational design of sustainable and efficient Negative Electrode materials will be proposed as open perspectives.
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transition metal carbodiimides as molecular Negative Electrode materials for lithium and sodium ion batteries with excellent cycling properties
ChemInform, 2016Co-Authors: Moulay Tahar Sougrati, Laure Monconduit, Ali Darwiche, Abdelfattah Mahmoud, Raphael P Hermann, Samuel Jouen, Richard Dronskowski, Lorenzo StievanoAbstract:FeNCN can be efficiently used as Negative Electrode material for alkali metal ion batteries.
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transition metal carbodiimides as molecular Negative Electrode materials for lithium and sodium ion batteries with excellent cycling properties
Angewandte Chemie, 2016Co-Authors: Moulay Tahar Sougrati, Laure Monconduit, Ali Darwiche, Abdelfattah Mahmoud, Raphael P Hermann, Samuel Jouen, Richard Dronskowski, Lorenzo StievanoAbstract:We report evidence for the electrochemical activity of transition-metal carbodiimides versus lithium and sodium. In particular, iron carbodiimide, FeNCN, can be efficiently used as Negative Electrode material for alkali-metal-ion batteries, similar to its oxide analogue FeO. Based on 57Fe Mossbauer and infrared spectroscopy (IR) data, the electrochemical reaction mechanism can be explained by the reversible transformation of the Fe−NCN into Li/Na−NCN bonds during discharge and charge. These new Electrode materials exhibit higher capacity compared to well-established Negative Electrode references such as graphite or hard carbon. Contrary to its oxide analogue, iron carbodiimide does not require heavy treatments (such as nanoscale tailoring, sophisticated textures, or coating) to obtain long cycle life with current density as high as 9 A g−1 for hundreds of charge–discharge cycles. Similar to the iron compound, several other transition-metal carbodiimides Mx(NCN)y with M=Mn, Cr, Zn can cycle successfully versus lithium and sodium. Their electrochemical activity and performance open the way to the design of a novel family of anode materials.
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NiP3: a promising Negative Electrode for Li- and Na-ion batteries
J. Mater. Chem. A, 2014Co-Authors: Julien Fullenwarth, Ali Darwiche, Adrien Soares, Bruno Donnadieu, Laure MonconduitAbstract:Due to the abundance and low cost of sodium-containing precursors ambient temperature sodium ion batteries are promising for large scale grid storage. The low melting point of Na (97.7 °C) compared to 180.6 C for Li represents a significant safety hazard for the use of Na metal anodes at ambient temperatures, which emphasizes the need for scientists and engineers to identify, design and develop new Negative Electrodes for Na-ion batteries. The identification of a suitable Negative Electrode is a crucial challenge for any further successful development of new cells, and to date efficient and competitive Negative Electrodes for NaB are still very rare. In this work we demonstrate that NiP3 could be a good challenger for this purpose. NiP3 based Electrodes are evaluated as Negative Electrode materials for Li-ion batteries (LiB) and Na-ion batteries (NaB). The study of the reaction mechanism reveals the formation of a phase of composition close to Li3P and Na3P embedding Ni nanoparticles as the final reaction product after a full discharge. While the direct conversion of NiP3 into Na3P is identified for the reaction versus Na, it is still unclear whether an amorphous phase exists during the first discharge for the reaction versus Li before the conversion. Furthermore, thanks to the carboxymethyl cellulose/ carbon black (CMC/CB) Electrode formulation, the NiP3 Electrode possesses a very promising capacity with a reversible storage capacity higher than 1000 mA h g-1 after 50 cycles for LiB and 900 mA h g-1 after 15 cycles for NaB, which represents one of the highest capacities ever sustained in Na-ion batteries.
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facile synthesis and long cycle life of snsb as Negative Electrode material for na ion batteries
Electrochemistry Communications, 2013Co-Authors: Ali Darwiche, Moulay Tahar Sougrati, Lorenzo Stievano, Bernard Fraisse, Laure MonconduitAbstract:Abstract We report significant electrochemical performances promoting SnSb as one of the most promising Negative Electrode material for rechargeable batteries. Appropriately formulated with the carboxymethyl cellulose binder and cycled in fluoroethylene carbonate containing electrolyte, it could sustain a reversible capacity largely exceeding 525 mAh g − 1 over more than 125 cycles at a rate of C/2 (55 mA/g), with a satisfactory coulombic efficiency of more than 97%. To our knowledge, this is actually the longest cycle life ever reported for an Electrode material vs. sodium.
Ali Darwiche - One of the best experts on this subject based on the ideXlab platform.
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transition metal carbodiimides as molecular Negative Electrode materials for lithium and sodium ion batteries with excellent cycling properties
ChemInform, 2016Co-Authors: Moulay Tahar Sougrati, Laure Monconduit, Ali Darwiche, Abdelfattah Mahmoud, Raphael P Hermann, Samuel Jouen, Richard Dronskowski, Lorenzo StievanoAbstract:FeNCN can be efficiently used as Negative Electrode material for alkali metal ion batteries.
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transition metal carbodiimides as molecular Negative Electrode materials for lithium and sodium ion batteries with excellent cycling properties
Angewandte Chemie, 2016Co-Authors: Moulay Tahar Sougrati, Laure Monconduit, Ali Darwiche, Abdelfattah Mahmoud, Raphael P Hermann, Samuel Jouen, Richard Dronskowski, Lorenzo StievanoAbstract:We report evidence for the electrochemical activity of transition-metal carbodiimides versus lithium and sodium. In particular, iron carbodiimide, FeNCN, can be efficiently used as Negative Electrode material for alkali-metal-ion batteries, similar to its oxide analogue FeO. Based on 57Fe Mossbauer and infrared spectroscopy (IR) data, the electrochemical reaction mechanism can be explained by the reversible transformation of the Fe−NCN into Li/Na−NCN bonds during discharge and charge. These new Electrode materials exhibit higher capacity compared to well-established Negative Electrode references such as graphite or hard carbon. Contrary to its oxide analogue, iron carbodiimide does not require heavy treatments (such as nanoscale tailoring, sophisticated textures, or coating) to obtain long cycle life with current density as high as 9 A g−1 for hundreds of charge–discharge cycles. Similar to the iron compound, several other transition-metal carbodiimides Mx(NCN)y with M=Mn, Cr, Zn can cycle successfully versus lithium and sodium. Their electrochemical activity and performance open the way to the design of a novel family of anode materials.
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NiP3: a promising Negative Electrode for Li- and Na-ion batteries
J. Mater. Chem. A, 2014Co-Authors: Julien Fullenwarth, Ali Darwiche, Adrien Soares, Bruno Donnadieu, Laure MonconduitAbstract:Due to the abundance and low cost of sodium-containing precursors ambient temperature sodium ion batteries are promising for large scale grid storage. The low melting point of Na (97.7 °C) compared to 180.6 C for Li represents a significant safety hazard for the use of Na metal anodes at ambient temperatures, which emphasizes the need for scientists and engineers to identify, design and develop new Negative Electrodes for Na-ion batteries. The identification of a suitable Negative Electrode is a crucial challenge for any further successful development of new cells, and to date efficient and competitive Negative Electrodes for NaB are still very rare. In this work we demonstrate that NiP3 could be a good challenger for this purpose. NiP3 based Electrodes are evaluated as Negative Electrode materials for Li-ion batteries (LiB) and Na-ion batteries (NaB). The study of the reaction mechanism reveals the formation of a phase of composition close to Li3P and Na3P embedding Ni nanoparticles as the final reaction product after a full discharge. While the direct conversion of NiP3 into Na3P is identified for the reaction versus Na, it is still unclear whether an amorphous phase exists during the first discharge for the reaction versus Li before the conversion. Furthermore, thanks to the carboxymethyl cellulose/ carbon black (CMC/CB) Electrode formulation, the NiP3 Electrode possesses a very promising capacity with a reversible storage capacity higher than 1000 mA h g-1 after 50 cycles for LiB and 900 mA h g-1 after 15 cycles for NaB, which represents one of the highest capacities ever sustained in Na-ion batteries.
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facile synthesis and long cycle life of snsb as Negative Electrode material for na ion batteries
Electrochemistry Communications, 2013Co-Authors: Ali Darwiche, Moulay Tahar Sougrati, Lorenzo Stievano, Bernard Fraisse, Laure MonconduitAbstract:Abstract We report significant electrochemical performances promoting SnSb as one of the most promising Negative Electrode material for rechargeable batteries. Appropriately formulated with the carboxymethyl cellulose binder and cycled in fluoroethylene carbonate containing electrolyte, it could sustain a reversible capacity largely exceeding 525 mAh g − 1 over more than 125 cycles at a rate of C/2 (55 mA/g), with a satisfactory coulombic efficiency of more than 97%. To our knowledge, this is actually the longest cycle life ever reported for an Electrode material vs. sodium.
Vivek B Shenoy - One of the best experts on this subject based on the ideXlab platform.
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The mixing mechanism during lithiation of Si Negative Electrode in Li-ion batteries: An Ab initio molecular dynamics study
Nano Letters, 2011Co-Authors: Priya Johari, Yue Qi, Vivek B ShenoyAbstract:In order to realize Si as a Negative Electrode material in commercial Li-ion batteries, it is important to understand the mixing mechanism of Li and Si, and stress evolution during lithiation in Si Negative Electrode of Li-ion batteries. Available experiments mainly provide the diffusivity of Li in Si as an averaged property, neglecting information regarding diffusivity of Si. However, if Si can diffuse as fast as Li, the stress generated during Li diffusion can be reduced. We, therefore, studied the diffusivity of Li as well as Si atoms in the Si-anode of Li-ion battery using an ab initio molecular dynamics-based methodology. The electrochemical insertion of Li into crystalline Si prompts a crystalline-to-amorphous phase transition. We considered this situation and thus examined the diffusion kinetics of Li and Si atoms in both crystalline and amorphous Si. We find that Li diffuses faster in amorphous Si as compared to crystalline Si, while Si remains relatively immobile in both cases and generates stresses during lithiation. To further understand the mixing mechanism and to relate the structure with electrochemical mixing, we analyzed the evolution of the structure during lithiation and studied the mechanism of breaking of Si-Si network by Li. We find that Li atoms break the Si rings and chains and create ephemeral structures such as stars and boomerangs, which eventually transform to Si-Si dumbbells and isolated Si atoms in the LiSi phase. Our results are found to be in agreement with the available experimental data and provide insights into the mixing mechanism of Li and Si in Si Negative Electrode of Li-ion batteries.
