A5036698809- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Ionic liquids properties and applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Supercapacitor Materials and Fabrication
- Crystallography and molecular interactions
- Layered Double Hydroxides Synthesis and Applications
- Inorganic Chemistry and Materials
- Magnesium Alloys: Properties and Applications
- Advanced battery technologies research
- Conducting polymers and applications
- Inorganic Fluorides and Related Compounds
- Advanced Battery Technologies Research
- Polyoxometalates: Synthesis and Applications
- Extraction and Separation Processes
- Hydrogen Storage and Materials
- Fuel Cells and Related Materials
- MXene and MAX Phase Materials
- Magnesium Oxide Properties and Applications
- Synthesis and characterization of novel inorganic/organometallic compounds
- Inorganic and Organometallic Chemistry
- Metal-Organic Frameworks: Synthesis and Applications
- Solid-state spectroscopy and crystallography
- Thermal Expansion and Ionic Conductivity
National Institute for Materials Science
2019-2025
National Alliance on Mental Illness
2020
Iwate University
2017-2019
Morioka University
2017-2019
Ueda Womens Junior College
2019
Green Chemistry
2019
Tokyo Metropolitan University
2017
Yokohama National University
2013-2016
Chalmers University of Technology
2015-2016
Hodogaya Chemical (Japan)
2014-2015
We report the data of liquid density, thermal properties including glass transition temperature, melting point, and decomposition surface tension, shear viscosity for imidazolium-based dicationic ionic liquids with anions bis(trifluoromethylsulfonyl)amide, bis(pentafluoroethylsulfonyl)amide, tetrafluoroborate, nitrate. To find unique general features liquids, their corresponding monocationic are also summarized. The results showed that density was high; temperature point were high, they...
Certain concentrated mixtures of salts and solvents are not simply "solutions" anymore, but they may be described as "ionic liquids". In this perspective paper, we describe possible criteria for the new family ionic liquids: "solvate" liquids. This subclass liquids was originally proposed by Angell et al. in their recent review; however, remain to debated. Concentrated lithium organic useful models these solvate liquids, effects salt concentration, types solvents, counter anions on structure...
Raman spectra and electrode potentials corroborated that glyme–Li salt solvate ionic liquids consist of crown-ether like complex cations counter anions with a few uncoordinated glyme molecules in the liquid state.
To develop a basic understanding of new class ionic liquids (ILs), "solvate" ILs, the transport properties binary mixtures lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA]) and oligoethers (tetraglyme (G4), triglyme (G3), diglyme (G2), monoglyme (G1)) or tetrahydrofuran (THF) were studied. The self-diffusion coefficient ratio solvents Li+ ions (Dsol/DLi) was good metric for evaluating stability complex cations consisting solvent(s). When molar solvent oxygen atoms ([O]/[Li+]) adjusted to...
A series of equimolar mixtures Li salts (LiX) and glymes (triglyme (G3) tetraglyme (G4)), [Li(glyme)]X with different anions (X: [N(SO2C2F5)2] = [BETI]; [N(SO2CF3)2] [TFSA]; [CF3SO3] [OTf]; BF4; NO3), were used as electrolytes to study the anionic effects on performance lithium–sulfur (Li–S) batteries. The dissolution lithium polysulfides (Li2Sm), which are discharge products elemental sulfur, was significantly suppressed in solvate ionic liquid (IL) electrolytes, seen [Li(G4)][BETI]...
Li+ intercalation into graphite electrodes was investigated in electrolytes consisting of triglyme (G3) and Li[TFSA] [TFSA = bis(trifluoromethanesulfonyl)amide]. Li+-intercalated successfully formed an equimolar molten complex, [Li(G3)1][TFSA]. The desolvation ions took place at the graphite/[Li(G3)1][TFSA] interface electrode potential range 0.3–0 V vs Li. In contrast, cointercalation G3 (intercalation solvate [Li(G3)1]+ cation) occurred [Li(G3)x][TFSA] containing excess (x > 1). This...
Solvent–ion and ion–ion interactions have significant effects on the physicochemical properties of electrolyte solutions for lithium batteries. The solvation structure Li+ formation ion pairs in composed triglyme (G3) a hydrofluoroether (HFE) containing 1 mol dm–3 Li[TFSA] (TFSA: bis(trifluoromethanesulfonyl)amide) were analyzed using pulsed-field gradient spin–echo (PGSE) NMR Raman spectroscopy. It was found that is preferentially solvated by G3 forms [Li(G3)]+ complex cation electrolytes....
Highly concentrated, molten mixtures of lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA]) and ether solvents (tetrahydrofuran (THF), monoglyme (G1), diglyme (G2), triglyme (G3)) were investigated as electrolytes for Li batteries. To compare the electrochemical reactions in with different solvents, ratio ether–oxygen atoms Li+ ([O]/[Li]) was fixed at four. The capacity a Li–LiCoO2 cell [Li(THF)4][TFSA] dramatically decreased upon charge/discharge cycling, whereas [Li(G3)1][TFSA] allowed...
An equimolar mixture of lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA]) and either triglyme (G3) or tetraglyme (G4) yielded stable molten complexes: [Li(G3)][TFSA] [Li(G4)][TFSA]. These are known as solvate ionic liquids (SILs). Glyme-based SILs have thermal electrochemical properties favorable for use lithium-conducting electrolytes in batteries. However, their intrinsically high viscosities low conductivities prevent practical application. Therefore, we diluted with molecular...
Li+ ion hopping conduction in highly concentrated solutions of lithium bis(fluorosulfonyl)amide (LiFSA) dissolved dinitrile solvents, namely succinonitrile, glutaronitrile, and adiponitrile, was investigated. Phase behaviors the LiFSA/dinitrile binary mixtures assessed by differential scanning calorimetry suggested that LiFSA dinitriles form stable solvates a molar ratio 1 : 2. For glass forming room temperature liquid is formed when [LiFSA]/[succinonitrile] > 1. The corresponding...
A series of binary mixtures composed glymes (triglyme, G3; tetraglyme, G4; pentaglyme, G5) and alkali-metal bis(trifluoromethanesulfonyl)amide salts (M[TFSA]; M = Li, Na, K) were prepared, the correlation between composition solvate stability was systematically investigated. Their phase diagrams Raman spectra suggested complexation with M[TFSA] in 1:1 and/or 2:1 molar ratio(s). From isothermal measurements, it found that formation structurally stable complexes solid state did not necessarily...
Molecular dynamics simulations of equimolar mixtures glymes (triglyme and tetraglyme) Li[TFSA] (lithium bis(trifluoromethylsulfonyl)amide) show that the glyme chain length affects coordination geometries Li(+), which induces changes in interactions between [Li(glyme)](+) complex [TFSA](-) anions diffusion ions mixtures.
Phase behavior of binary mixtures tetraglyme (G4) and Mg[TFSA]2 (TFSA: bis(trifluoromethanesulfonyl)amide) was investigated. In a 1:1 molar ratio, G4 formed stable complex with melting point 137 °C. X-ray crystallography single crystal the grown from G4-Mg[TFSA]2 mixture revealed that molecule wraps around Mg2+ to form [Mg(G4)]2+ cation, two [TFSA]− anions also participate in coordination crystal. The thermal stability [Mg(G4)][TFSA]2 examined by thermogravimetry, it found is up 250 Above...
Hydrofluoroethers have recently been used as the diluent to a lithium battery electrolyte solution increase and decrease ionic conductivity viscosity, respectively. In order clarify Li+ local structure in 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (HFE) diluted [Li(G4)][TFSA] (G4, tetraglyme; TFSA, bis(trifluoromethanesulfonyl)amide) solvate liquid, Raman spectroscopic study has done with DFT calculations. It turned out that HFE never coordinates directly, solvent (G4) shared...
The development of noncorrosive but highly efficient electrolytes has been a long-standing challenge in magnesium rechargeable battery (MRB) research fields. As fluorinated alkoxyborate-based have overcome serious problems associated with conventional electrolytes, they are regarded as promising for practical MRB applications. An electrolyte containing representative alkoxyborate Mg[B(HFIP)4]2 ([B(HFIP)4]: tetrakis(hexafluoroisopropoxy) borate) was prepared through general synthetic routes...
Abstract New materials for electrochemical energy storage and conversion are the key to electrification sustainable development of our modern societies. Molecular modelling based on principles quantum mechanics statistical as well empowered by machine learning techniques can help us understand, control design at atomistic precision. Therefore, this roadmap, which is a collection authoritative opinions, serves gateway both experts beginners have quick overview current status corresponding...
We describe here the electrochemical properties and battery performance of polymer electrolytes composed ABA-triblock copolymers Li-glyme solvate ionic liquids (SILs), which consist [Li(glyme)]+ complex cation bis(trifluoromethanesulfoly)amide ([TFSA]−) anion, to simultaneously achieve high conductivity, thermal stability, a wide potential window. Three different block copolymers, consisting SIL-incompatible A segment (polystyrene, PSt) SIL-compatible B segments (poly(methyl methacrylate)...
To achieve a sustainable-energy society in the future, next-generation highly efficient energy storage technologies, particularly those based on multivalent metal negative electrodes, are urgently required to be developed. Magnesium rechargeable batteries (MRBs) promising options owing many advantageous chemical and electrochemical properties of magnesium. However, substantially low working voltage sulfur-based positive electrodes may hinder MRBs becoming alternatives current Li-ion...
One specific magnesium battery electrolyte composed of Mg[Al(HFIP) 4 ] 2 and G2 exhibits outstanding electrochemical activity owing to the enhanced mass transport combined with favorable interfacial kinetics.
High-performance electrolytes are at the heart of magnesium battery development. Long-term stability along with low potential difference between plating and stripping processes needed to consider them for next-generation devices. Within this work, we perform an in-depth characterization novel Mg[Al(hfip)
Magnesium rechargeable batteries (MRBs) promise to be the next post lithium-ion that can help meet increasing demand for high-energy, cost-effective, high-safety energy storage devices. Early prototype MRBs use molybdenum-sulfide cathodes have low terminal voltages, requiring development of oxide-based capable overcoming sulfide's Mg2+ conductivity. Here, we fabricate an ultraporous (>500 m2 g–1) and ultrasmall (<2.5 nm) cubic spinel MgMn2O4 (MMO) by a freeze-dry assisted room-temperature...
Magnesium rechargeable batteries are potential successors to lithium-ion batteries, owing their low cost, superior safety, and high volumetric energy density. However, the development of high-energy high-rate cathode materials remains challenging. Oxide-type cathodes, specifically spinels, have become a focus attention due higher voltage operation capacity. Nevertheless, previous studies predominantly centered on high-temperature operations, account sluggish diffusion Mg ions in solids...
We prepared a series of binary mixtures composed selected Na salts and glymes (tetraglyme, G4, pentaglyme, G5) with different salt concentrations anionic species ([X]−: [N(SO2CF3)2]− = [TFSA]−, [N(SO2F)2]− [FSA]–, ClO4–, PF6–) studied the effects concentration, structure, glyme chain length on their phase diagrams solvate structures. The clearly illustrate that all form 1:1 complexes, [Na(G4 or G5)1][X]. thermal stability equimolar was drastically improved in comparison those diluted...