Tag: M.W=200-250

Siedle, A. R. published the artcileCyanographite, Formula: C10H22O5, the main research area is cyanographite.

Reactions of graphite fluoride with NaCN in tetraglyme, DMF, or water lead to the formation of disordered graphitic carbon by reductive defluorination and to the oxidation of cyanide to cyanogen followed by its polymerization to paracyanogen. There is also XPS and NMR evidence for the presence of CN groups attached to the carbon in cyanographite. The product of this unselective chem. is a composite of paracyanogen and cyanographite, having a small d. of CN groups. Difficulties in the synthesis of new carbon materials from graphite fluoride are discussed.

Journal of Physical Chemistry C published new progress about Cyanation. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Formula: C10H22O5.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Sun, Yue published the artcileFast and Reversible Four-Electron Storage Enabled by Ethyl Viologen for Rechargeable Magnesium Batteries, Synthetic Route of 143-24-8, the main research area is four electron rechargeable magnesium battery ethyl viologen.

Magnesium (Mg) batteries are the most promising “”post-lithium-ion”” energy storage technologies owing to their high theor. energy d., low cost, and intrinsic safety with air and moisture. However, the development of Mg batteries has been limited to cathode materials leading to low power, low reversible energy d., and poor cycle life. Here, a new Mg cathode is reported based on Et viologen (EV), which not only has a fast redox couple EV2+/EV0 but also is capable of coupling with redox-active anions, such as iodide (I-), achieving a total four-electron storage. The EV2+/EV0 redox couple demonstrates a superior rate performance (10 C) and stable cycle life (500 cycles) owing to intrinsic fast electrode kinetics. A high material utilization (>80%) can be achieved at 1.0 C under a high areal loading of 5 mg cm-2. When coupling with iodide I-, a reversible four-electron storage is achieved with a high energy d. (304.2 Wh kg-1) and a stable cycle life (>100 cycles). This study provides effective strategies for designing reversible multielectron storage for high-rate and high-energy rechargeable Mg batteries.

Advanced Energy Materials published new progress about Diffusion. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Synthetic Route of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Pipertzis, Achilleas published the artcileIonic Conductivity in Polyfluorene-Based Diblock Copolymers Comprising Nanodomains of a Polymerized Ionic Liquid and a Solid Polymer Electrolyte Doped with LiTFSI, COA of Formula: C9H20O5, the main research area is ionic conductivity polyfluorene diblock copolymer polymer electrolyte doped LiTFSI.

Diblock copolymer electrolytes based on a π-conjugated polyfluorene (PF) backbone were synthesized comprising nanodomains of a polymerized ionic liquid (PIL) and of a solid polymer electrolyte (SPE). The former consists of a single-ion conductor based on an imidazolium alkyl chain with a [Br]- counteranion grafted on the PF backbone. The latter consists of short ethylene oxide (EO) chains, grafted on the PF backbone and further doped with LiTFSI. The two nanophases support ionic conductivity, whereas the rigid PF backbone provides the required mech. stability. In the absence of LiTFSI, ionic conductivity in the PIL nanophase is low and exhibits an Arrhenius temperature dependence. LiTFSI substitution enhances ionic conductivity by about 3 orders of magnitude and further changes to a Vogel-Fulcher-Tammann temperature dependence. However, at ambient temperature, ionic conductivity is lower than in the corresponding PEO/LiTFSI electrolytes. X-ray studies and thermal anal. revealed that the conjugated backbone imparts liquid-crystalline order that can be fine-tuned through the EO side group length. Ionic conductivity measurements performed as a function of pressure identified local jumps of [Li]+ and [Br]- ions in the resp. SPE/PIL nanophases as responsible for the ionic conductivity Between the two ions, it is [Li]+ that has the major contribution to the ionic conductivity The current results provide designing rules for new copolymers that comprise two different ionic nanodomains (PIL and SPE) and a conjugated backbone that can further support electronic conduction.

Macromolecules (Washington, DC, United States) published new progress about Diffusion. 23783-42-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11-Tetraoxatridecan-13-ol, and the molecular formula is C9H20O5, COA of Formula: C9H20O5.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Richter, Raphael published the artcileInsights into Self-Discharge of Lithium- and Magnesium-Sulfur Batteries, Formula: C10H22O5, the main research area is lithium magnesium sulfur battery diffusion.

Magnesium-sulfur (Mg-S) batteries represent a very promising emerging cell chem. However, developments in Mg-S batteries are in an early stage, and the system exhibits problems similar to those of early lithium-sulfur (Li-S) batteries. The significant challenges are the low Coulombic efficiency and short cycle life of Mg-S batteries, mainly associated with the well-known polysulfide shuttle. An obvious result of this phenomenon is the rapid self-discharge of Mg-S batteries. In this article, we present a multiscale simulation framework for metal-sulfur batteries. In our approach, we provide a continuum description of chem. and electrochem. processes at the pos. and neg. electrodes. In combination with a one-dimensional (1D) model for the transport of dissolved species in the electrolyte, this approach allows us to reproduce and interpret exptl. data measured on Li-S and Mg-S batteries. We focus on the common properties of Li-S and Mg-S batteries as well as on the key differences causing the much more rapid self-discharge of the Mg system. We identify side reactions on the anode surface as a limiting process, while other factors, such as the mobility of dissolved species and solid-phase kinetics, play a minor role.

ACS Applied Energy Materials published new progress about Diffusion. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Formula: C10H22O5.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Shigenobu, Keisuke published the artcileSolvent effects on Li ion transference number and dynamic ion correlations in glyme- and sulfolane-based molten Li salt solvates, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is solvent effect lithium transference number glyme sulfolane solvate.

The Li+ transference number of electrolytes is one of the key factors contributing to the enhancement in the charge-discharge performance of Li secondary batteries. However, a design principle to achieve a high Li+ transference number has not been established for liquid electrolytes. To understand the factors governing the Li+ transference number tLi, we investigated the influence of the ion-solvent interactions, Li ion coordination, and correlations of ion motions on the Li+ transference number in glyme (Gn, n = 1-4)- and sulfolane (SL)-based molten Li salt solvate electrolytes with lithium bis(trifluoromethansulfonyl)amide (LiTFSA). For the 1 : 1 tetraglyme-LiTFSA molten complex, [Li(G4)][TFSA], the Li+ transference number estimated using the potentiostatic polarisation method (tPPLi = 0.028) was considerably lower than that estimated using the self-diffusion coefficient data with pulsed filed gradient (PFG)-NMR (tNMRLi = 0.52). The dynamic ion correlations (i.e., cation-cation, anion-anion, and cation-anion cross-correlations) were determined from the exptl. data on the basis of Roling and Bedrov′s concentrated solution theory, and the results suggest that the strongly neg. cross-correlations of the ion motions (especially for cation-cation motions) are responsible for the extremely low tPPLi of [Li(G4)][TFSA]. In contrast, tPPLi is larger than tNMRLi in the SL-based electrolytes. The high tPPLi of the SL-based electrolytes was ascribed to the substantially weaker anti-correlations of cation-cation and cation-anion motions. Whereas the translational motions of the long-lived [Li(glyme)]+ and [TFSA]- dominate the ionic conduction for [Li(G4)][TFSA], Li ion hopping/exchange conduction was reported to be prevalent in the SL-based electrolytes. The unique Li ion conduction mechanism is considered to contribute to the less correlated cation-cation and cation-anion motions in SL-based electrolytes.

Physical Chemistry Chemical Physics published new progress about Diffusion. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Hu, Pu published the artcileCapturing the differences between lithiation and sodiation of nanostructured TiS2 electrodes, Application In Synthesis of 143-24-8, the main research area is titanium disulfide nanoparticle electrode lithiation sodiation.

In this study TiS2 is chosen as a model electrode material to investigate the relationship between the electrochem. and mech. performance of layered cathodes for Na-ion batteries. Employing NaFP6 in EC/DMC as the electrolyte allowed for the most promising electrochem. properties recorded in the literature, namely a reversible capacity of 203 mAh g-1 at 0.2 C and 88 mAh g-1 at 10 C with a capacity retention of 92% over 50 cycles. Despite this promising performance the capacity still decayed during long term cycling. In-situ x-ray diffraction and high-resolution transmission electron microscopy imaging revealed that TiS2 underwent a large expansion of 17.7% along the c direction and irreversible phase transformations took place during the sodiation/de-sodiation process, which lead to severe mech. strains and intragranular cracks. In comparison, the mech. stability of TiS2 in Li-ion cells was significantly higher. The exptl. results are interpreted within a continuum mechanics model which revealed that the maximum effective von Mises stress that is present at the interface between the ion-intercalated TiS2 and pristine TiS2 is about four times higher during sodiation than lithiation indicating that the electrode is more susceptible to failure/fracture during sodiation.

Nano Energy published new progress about Diffusion. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Application In Synthesis of 143-24-8.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Grundy, Lorena S. published the artcileImpact of frictional interactions on conductivity, diffusion, and transference number in ether- and perfluoroether-based electrolytes, Related Products of ethers-buliding-blocks, the main research area is lithium tetraglyme perfluoroether mol interaction electrolyte ionic conductivity thermodn.

There is growing interest in fluorinated electrolytes due to their high-voltage stability. We use full electrochem. characterization based on concentrated solution theory to investigate the underpinnings of conductivity and transference number in tetraglyme/LiTFSI mixtures (H4) and a fluorinated analog, C8-DMC, mixed with LiFSI (F4). Conductivity is significantly lower in F4 than in H4, and F4 exhibits neg. cation transference numbers, while that of H4 is pos. at most salt concentrations By relating Stefan-Maxwell diffusion coefficients, which quantify ion-solvent and cation-anion frictional interactions, to conductivity and transference number, we determine that at high salt concentrations, the origin of differences in transference number is differences in anion-solvent interactions. We also define new Nernst-Einstein-like equations relating conductivity to Stefan-Maxwell diffusion coefficients In H4 at moderate to high salt concentrations, we find that all mol. interactions must be included. However, we demonstrate another regime, in which conductivity is controlled by cation-anion interactions. The applicability of this assumption is quantified by a pre-factor, β±, which is similar to the “”ionicity”” pre-factor that is often included in the Nernst-Einstein equation. In F4, β± is unity at all salt concentrations, indicating that ionic conductivity is entirely controlled by the Stefan-Maxwell diffusion coefficient quantifying cation-anion frictional interactions.

Journal of the Electrochemical Society published new progress about Diffusion. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Related Products of ethers-buliding-blocks.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Xing, Wei published the artcileRevealing the impacting factors of cathodic carbon catalysts for Li-CO2 batteries in the pore-structure point of view, Application of 2,5,8,11,14-Pentaoxapentadecane, the main research area is impact cathodic carbon catalyst lithium dioxide battery pore structure.

Li-CO2 battery is a very promising power source with high energy d. Its performance is strongly restricted by the cathode catalysts, in which C-based catalysts were mostly studied. However, the impacting factors on the performance of C catalysts is not yet elucidated. Here, the authors employed a variety of C materials with different pore-structure features as the cathode catalysts of Li-CO2 batteries to reveal which are the main influencing factor on the catalytic performance of C catalysts. Suitable pore shape (most important), large pore size and high surface area are crucial factors to the catalytic performance of C catalysts. This finding is of great significance to the further development of Li-CO2 batteries.

Electrochimica Acta published new progress about Aerogels. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Application of 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Dutta, Prasit Kumar published the artcileMechanism of Na-Ion Storage in BiOCl Anode and the Sodium-Ion Battery Formation, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is bismuth oxychloride anode Prussian blue cathode sodium ion battery.

We systematically unravel the mechanism by which sodium ion reacts electrochem. with ionically layered BiOCl nanosheets. Solution-processed BiOCl nanosheets were cycled using slow scan cyclic voltammetry (50 μV s-1) to reach the desired reaction voltages. Characterizations using in situ impedance spectroscopy and ex situ X-ray diffraction, Raman spectroscopy, and transmission electron microscopy are used to map the mechanism of Na-ion insertion and deinsertion in BiOCl nanosheets. It was found that BiOCl initially undergoes a conversion reaction to form metallic Bi. The metallic Bi further alloys with sodium ion to form Na3Bi and NaBi, a compound whose formation has not been reported before. We also detect the formation of BiO, Na3BiO4, and NaBiO3. Finally, BiOCl is used as anode against a Prussian blue cathode to prepare a full cell that is capable of providing an average discharge potential of ∼2.2 V at the 100th cycle. The overall study reveals new insights and key differences in the mechanism of sodium-based electrochem. energy storage systems.

Journal of Physical Chemistry C published new progress about Alloying. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Liu, Weiwei published the artcileLight-Assisted Li-O2 Batteries with Lowered Bias Voltages by Redox Mediators, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane, the main research area is redox mediator lithium oxygen battery bias voltage; bias voltage; lithium-oxygen batteries; photocatalysts; photogenerated holes and electrons; redox mediators.

The enormous overpotential caused by sluggish kinetics of the oxygen reduction reaction and the oxygen evolution reaction prevents the practical application of Li-O2 batteries. The recently proposed light-assisted strategy is an effective way to improve round-trip efficiency; however, the high-potential photogenerated holes during the charge would degrade the electrolyte with side reactions and poor cycling performance. Herein, a synergistic interaction between a polyterthiophene photocatalyst and a redox mediator is employed in Li-O2 batteries. During the discharge, the voltage can be compensated by the photovoltage generated on the photoelectrode. Upon the charge with illumination, the photogenerated holes can be consumed by the oxidization of iodide ions, and thus the external circuit voltage is compensated by photogenerated electrons. Accordingly, a smaller bias voltage is needed for the semiconductor to decompose Li2O2, and the potential of photogenerated holes decreases. Finally, the round-trip efficiency of the battery reaches 97% with a discharge voltage of 3.10 V and a charge voltage of 3.19 V. The batteries show stable operation up to 150 cycles without increased polarization. This work provides new routes for light-assisted Li-O2 batteries with reduced overpotential and boosted efficiency.

Small published new progress about Band gap. 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Recommanded Product: 2,5,8,11,14-Pentaoxapentadecane.

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem