Polymer electrolyte plasticized with PEG-borate ester having high ionic conductivity and thermal stability

Kato, Yoshifumi; Hasumi, Kohji; Yokoyama, Shinichi; Yabe, Takeshi; Ikuta, Hiromasa; Uchimoto, Yoshiharu; Wakihara, Masataka

doi:10.1016/s0167-2738(02)00450-2

Cited by 90 publications

(57 citation statements)

References 19 publications

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“…[2][3][4][5][6][7] (see Figure 1). Three kinds of plasticizers, namely, B-PEG, Al-PEG, or PEG-DME, and two kinds of Li salts, that is, .…”

Section: Methodsmentioning

confidence: 99%

“…Details of the preparation are described elsewhere. [3,4,7] The temperature dependence of the ionic conductivity of the sample was determined through AC impedance experiments carried out using a Hewlett-Packard 4192A LF impedance analyzer over the frequency range from 5 Hz to 13 MHz. Samples of the SPE films (1 mm thick) were sandwiched between two stainless-steel electrodes in an Ar-filled air-tight vessel.…”

Section: Methodsmentioning

confidence: 99%

“…In this respect, much attention has been paid to increasing the ionic conductivity of SPEs by designing polymer structures at the molecular level, adding plasticizers, and so on. In a previous study, we suggested the addition of a plasticizer composed of poly(ethylene glycol) (PEG)-borate ester (B-PEG) [2,3] or PEG-aluminate ester (Al-PEG) [4] (see Figure 1), which shows enhanced ionic conductivity and thermal stability (higher flash points of plasticizers [3] ). In addition, a higher transport number with a lowering of the anion mobility and the salt dissociation was expected for these SPEs due to the Lewis acidity of the group-13 elements, which would capture and trap the anions selectively.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Transport in Li‐Conductive Polymer Electrolytes Plasticized with Poly(ethylene glycol)–Borate/Aluminate Ester

et al. 2009

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The addition of plasticizers into Li(+)-conductive solid polymer electrolytes (SPEs) is a commonly known technique to enhance the ionic conductivity. Among the used plasticizers, alkoxides of group-13 elements [such as poly(ethylene glycol) (PEG)-borate ester] are promising candidates due to the Lewis acidity of the elements of this group (i.e. B, Al, and so on), which interact with the anions and may increase the degree of dissociation of the salts and the transport number of the SPEs. By means of pulsed-gradient stimulated-echo NMR (PGStE-NMR) and AC impedance measurements, we investigate the effect of Lewis acidity originated from group-13 elements on the transport number and the dissociation rate of SPEs containing various plasticizers. Our results show that the degree of salt dissociation is significantly enhanced by the addition of plasticizers including group-13 elements, whereas only a small or negligible increase of the transport number is observed for these SPEs. We infer that the plasticizers exhibiting Lewis acidity associate with the anions, and that the associated pairs can migrate in the SPEs as fast as free anions, which results in a lower transport number than expected.

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“…[2][3][4][5][6][7] (see Figure 1). Three kinds of plasticizers, namely, B-PEG, Al-PEG, or PEG-DME, and two kinds of Li salts, that is, .…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Transport in Li‐Conductive Polymer Electrolytes Plasticized with Poly(ethylene glycol)–Borate/Aluminate Ester

et al. 2009

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“…To this end, a new type of solid polymer electrolyte with high thermal stability was produced with PEG-borate ester as plasticizer. [134] The relationship between the ethylene oxide (EO) chain length of PEG-borate esters and the ionic conductivity, thermal stability, and electrochemical stability of the GPEs were carefully investigated. When the EO chain of the PEG-borate ester (CH 3 O(CH 2 CH 2 O) n H) had a repeating unit number of n = 3, the resulting polymer electrolyte showed the highest ionic conductivity with high thermal and electrochemical stability.…”

Section: Gpes With High Thermal Stabilitymentioning

confidence: 99%

Gel Polymer Electrolytes for Electrochemical Energy Storage

Cheng

Pan

Zhao

et al. 2017

Advanced Energy Materials

755

562

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storage devices with adjustable shapes and high flexibility, which is promising for the burgeoning portable and wearable electronics. [7][8][9] Furthermore, the flexibility and elasticity of GPEs are also prone to tolerate the volume change of electrode materials and the dendrites of lithium metal during charge and discharge processes. [10][11][12][13] As a consequence, GPEs have become one of the most desirable alternatives among various electrolytes for the electrochemical energy storage devices, and significant progress has been made in lithium-ion batteries (LIBs), supercapacitors (SCs), lithium-oxygen (Li-O 2 ) batteries as well as the other kinds of electrochemical energy storage devices, such as sodium-ion batteries, lithium-sulfur batteries, fuel cells, and zinc-air batteries. [14][15][16] In order to meet the requirements of wearable devices for flexibility and deformability, more special GPEs with tough, [17] stretchable, [18] and compressible [19] functionalities have been also developed.Typically, a polymeric framework is adopted in GPEs as host material, providing high mechanical integrity. Several criteria for a good polymer host lie in: [20][21][22] (i) fast segmental motion of polymer chain; (ii) special groups promoting the dissolution of salts; (iii) low glass transition temperature (T g ); (iv) high molecular weight; (v) wide electrochemical window; (vi) high degradation temperature. Within the framework, the salts in the GPEs serve as the sources of the charge carriers, which are generally required to have large anions and low dissociation energy for easier dissociating-induced free/mobile ions. According to the types of electrolytes, there are four categories of GPEs based on proton, [23] alkaline, [24] conducting salts, and ionic liquids (ILs). [25] The criteria for an appropriate electrolyte include: [26][27][28] (i) good dissociation without forming ion pairs or ion aggregation; (ii) high thermal, chemical, and electrochemical stability; (iii) high ionic conductivity. In order to dissolve both the polymer hosts and electrolytic salts, the organic/ aqueous solvents are introduced to provide the medium for ionic conduction. A good solvent should simultaneously have high dielectric constant (ɛ > 15), donor number for more dissociation of ion and chemical and electrochemical stability. Organic solvents normally include ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dimethyl formamide (DMF), dimethyl sulphoxide, ethyl methyl carbonate, and tetrahydrofuran.To prepare a high-performance GPE, it is essential to select the species of host polymer, solvent, and electrolytic salt, and then blend them by solution or melt processes, such as casting With the booming development of flexible and wearable electronics, their safety issues and operation stabilities have attracted worldwide attentions. Compared with traditional liquid electrolytes, gel polymer electrolytes (GPEs) are preferred due to their higher safety and adaptability to the design of ...

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“…Lewis acid boron and Lewis-base oxygen interact with both cations and anions in the electrolytes and contribute to the ion-pairing in the electrolytes [20][21][22][23]. Borane or borate derivatives can also improve the thermal stability of the electrolytes [24]. Lithium batteries or ultracapacitors include these kinds of stable branched electrolytes either directly or imbibing into porous nanofibers that have been produced via electrospinning.…”

Section: Introductionmentioning

confidence: 99%

Polymer Electrolytes Based on Borane/Poly(ethylene glycol) Methyl Ether for Lithium Batteries

Soydan

Akdeniz

2017

Journal of Chemistry

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This work presents a different approach to preparing polymer electrolytes having borate ester groups for lithium ion batteries. The polymers were synthesized by reaction between poly(ethylene glycol) methyl ether (PEGME) and BH 3 -THF complex. Molecular weight of PEGMEs was changed with different chain lengths. Then the polymer electrolytes comprising boron were prepared by doping of the matrices with CF 3 SO 3 Li at various molar ratios with respect to EO to Li and they are abbreviated as PEGMEX-B-. The identification of the PEGME-borate esters was carried out by FTIR and 1 H NMR spectroscopy. Thermal properties of these electrolytes were investigated via thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The ionic conductivity of these novel polymer electrolytes was studied by dielectric-impedance spectroscopy. Lithium ion conductivity of these electrolytes was changed by the length of PEGME as well as the doping ratios. They exhibit approximate conductivities of 10 −4 S⋅cm −1 at 30 ∘ C and 10 −3 S⋅cm

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Polymer electrolyte plasticized with PEG-borate ester having high ionic conductivity and thermal stability

Cited by 90 publications

References 19 publications

Dynamic Transport in Li‐Conductive Polymer Electrolytes Plasticized with Poly(ethylene glycol)–Borate/Aluminate Ester

Dynamic Transport in Li‐Conductive Polymer Electrolytes Plasticized with Poly(ethylene glycol)–Borate/Aluminate Ester

Gel Polymer Electrolytes for Electrochemical Energy Storage

Polymer Electrolytes Based on Borane/Poly(ethylene glycol) Methyl Ether for Lithium Batteries

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