Non-flammable super-concentrated polymer electrolyte with “solvated ionic liquid” for lithium-ion batteries

Ding, Dong; Maeyoshi, Yuta; Kubota, Masaaki; Wakasugi, Jungo; Kanamura, Kiyoshi; Abe, Hidetoshi

doi:10.1016/j.jpowsour.2021.230099

Cited by 18 publications

(12 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decrease in melting temperatures ( T m ) in electrolytes was architecture-dependent. More specifically, increasing branching at the same total molar mass of 20 kDa lowered the T m more significantly, implying a higher degree of coordination between EO units and the salt ions as the degree of branching increased (see Table S1 values in the SI) . Similarly, the addition of the LiTFSI salt into PEO matrices severely decreased the crystallization with decreasing melting enthalpies for all architectures, but the extent of the relative decrease was architecture-dependent such that the higher the degree of branching, the lower the enthalpies (for the same total molar mass). ,,, More importantly, the fully amorphous PEO (l) phase boundary shifts toward lower salt concentrations with increasing branching.…”

Section: Resultsmentioning

confidence: 92%

“…The results at high salt concentrations are also important as the salt ions tend to aggregate, leading to decreased Li + conductivity 38 when the salt concentration increases above the critical point as shown by the salt concentration-dependent Li-ion conductivities in Figure 3 . We performed Fourier transform infrared (FT-IR) and high-temperature XRD to investigate ion aggregation ( Figures 4 and 5 ).…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic peaks monitored for pure PEO at 1467, 1341, 1240, 1097, 958, and 841 cm –1 could be attributed to CH 2 scissoring, asymmetric CH 2 wagging, asymmetric CH 2 twisting, C–O–C stretching, gauche C–C conformation, and CH 2 rocking, respectively. , The broad peak from 2750 to 3000 cm –1 corresponds to asymmetric CH 2 stretching. , These characteristic peaks are also seen in the case of electrolyte samples with significant changes in peak positions and intensities with increasing salt concentration for those two fundamental peaks positioned at 746 and 1634 cm –1 . These peaks have been commonly used as representative vibrational modes attributed to ion pair formation and aggregation, respectively, ,,− which indicates ion pairing and clustering effects.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Decoding Polymer Architecture Effect on Ion Clustering, Chain Dynamics, and Ionic Conductivity in Polymer Electrolytes

Bakar

Darvishi

Aydemir

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Poly(ethylene oxide) (PEO)-based polymer electrolytes are a promising class of materials for use in lithium-ion batteries due to their high ionic conductivity and flexibility. In this study, the effects of polymer architecture including linear, star, and hyperbranched and salt (lithiumbis(trifluoromethanesulfonyl)imide (LiTFSI)) concentration on the glass transition (T g ), microstructure, phase diagram, free volume, and bulk viscosity, all of which play a significant role in determining the ionic conductivity of the electrolyte, have been systematically studied for PEO-based polymer electrolytes. The branching of PEO widens the liquid phase toward lower salt concentrations, suggesting decreased crystallization and improved ion coordination. At high salt loadings, ion clustering is common for all electrolytes, yet the cluster size and distribution appear to be strongly architecture-dependent. Also, the ionic conductivity is maximized at a salt concentration of [Li/EO ≈ 0.085] for all architectures, and the highly branched polymers displayed as much as three times higher ionic conductivity (with respect to the linear analogue) for the same total molar mass. The architecture-dependent ionic conductivity is attributed to the enhanced free volume measured by positron annihilation lifetime spectroscopy. Interestingly, despite the strong architecture dependence of ionic conductivity, the salt addition in the highly branched architectures results in accelerated yet similar monomeric friction coefficients for these polymers, offering significant potential toward decoupling of conductivity from segmental dynamics of polymer electrolytes, leading to outstanding battery performance.

show abstract

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Decoding Polymer Architecture Effect on Ion Clustering, Chain Dynamics, and Ionic Conductivity in Polymer Electrolytes

Bakar

Darvishi

Aydemir

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…5,6 Several attempts have been made to use nonflammable solvents, thermally and electrochemically stable (non-fluorinated) Li-salts, as well as additives to improve safety. [7][8][9][10][11][12] There is an urge to develop new salts and solvents with beneficial physical and chemical properties that can potentially replace the conventional fluorinated electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Aromatic heterocyclic anion based ionic liquids and electrolytes

Ahmed

Rao

Филиппов

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…[ 74 ] Recently, Abe and co‐workers developed a new ionogel electrolyte based on the PEO framework and a high concentration of LiTFSI in “solvated ionic liquid” by the blending method, in which tetrahydrofuran (THF) was chosen as the solvent. [ 75 ] Although PEO‐based ionogels have been widely studied, combining solvated ionic liquid and THF solvent is rather interesting. Polyimides (PIs) are another widely used material in the electrochemical field due to their high thermal stability and mechanical properties.…”

Section: Preparation and Structure Of Ionogel Membrane Electrolytesmentioning

confidence: 99%

Ionogel‐Based Membranes for Safe Lithium/Sodium Batteries

Wang

Jiang

2022

Advanced Materials

View full text Add to dashboard Cite

Alkali (lithium, sodium)‐based second batteries are considered one of the brightest candidates for energy‐storage applications in order to utilize the random and intermittent renewable energy to achieve carbon neutrality. Conventional lithium/sodium batteries containing liquid organic electrolytes are vulnerable to electrolytes leakage and even combustion, which hinders their large‐scale and reliable application. All‐solid‐state electrolytes which are considered to have better safety have been developed in recent years. However, most of them suffer from low ionic conductivity and large interfacial resistance with the electrode. Ionogel‐electrolyte membranes composed of ionic liquids and solid matrices, have attracted much attention because of their nonvolatility, nonflammability, and superior chemical and electrochemical properties. This review focuses on the most recent advances of ionogel electrolytes that sprang up with the emerging demand and progress of safe lithium/sodium batteries. The ionogel‐electrolyte membranes are discussed based on the framework components and preparation methods. Their structure and properties, including ionic conductivity, mechanical strength, electrochemical stabilities, and so on, are demonstrated in combination with their applications. The current challenges and insights on the future development of ionogel electrolytes for advanced safe lithium/sodium batteries are also proposed.

show abstract

Non-flammable super-concentrated polymer electrolyte with “solvated ionic liquid” for lithium-ion batteries

Cited by 18 publications

References 44 publications

Decoding Polymer Architecture Effect on Ion Clustering, Chain Dynamics, and Ionic Conductivity in Polymer Electrolytes

Decoding Polymer Architecture Effect on Ion Clustering, Chain Dynamics, and Ionic Conductivity in Polymer Electrolytes

Aromatic heterocyclic anion based ionic liquids and electrolytes

Ionogel‐Based Membranes for Safe Lithium/Sodium Batteries

Contact Info

Product

Resources

About