Cross-linked polymeric ionic liquids ion gel electrolytes by in situ radical polymerization

Chen, Liya; Fu, Jing; Lü, Qi; Shi, Liyi; Li, Mengmeng; Dong, Linna; Xu, Yufeng; Jia, Rongrong

doi:10.1016/j.cej.2019.122245

Cited by 71 publications

(53 citation statements)

References 47 publications

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“…The broad peak appearing at 2941 cm −1 is associated with the asymmetric C−H stretching. The sharp peak located at 1647 cm −1 is assigned to the C=O stretching of carboxyl group [ 36 ]. The appearance of peaks in the region of 1562 cm −1 could be assigned to the strong C=C stretching vibration from α, β-unsaturated ketone of the polymer composites [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

Optimization of the Electrochemical Performance of a Composite Polymer Electrolyte Based on PVA-K2CO3-SiO2 Composite

et al. 2020

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Composite polymer electrolyte (CPE) based on polyvinyl alcohol (PVA) polymer, potassium carbonate (K2CO3) salt, and silica (SiO2) filler was investigated and optimized in this study for improved ionic conductivity and potential window for use in electrochemical devices. Various quantities of SiO2 in wt.% were incorporated into PVA-K2CO3 complex to prepare the CPEs. To study the effect of SiO2 on PVA-K2CO3 composites, the developed electrolytes were characterized for their chemical structure (FTIR), morphology (FESEM), thermal stabilities (TGA), glass transition temperature (differential scanning calorimetry (DSC)), ionic conductivity using electrochemical impedance spectroscopy (EIS), and potential window using linear sweep voltammetry (LSV). Physicochemical characterization results based on thermal and structural analysis indicated that the addition of SiO2 enhanced the amorphous region of the PVA-K2CO3 composites which enhanced the dissociation of the K2CO3 salt into K+ and CO32− and thus resulting in an increase of the ionic conduction of the electrolyte. An optimum ionic conductivity of 3.25 × 10−4 and 7.86 × 10−3 mScm−1 at ambient temperature and at 373.15 K, respectively, at a potential window of 3.35 V was observed at a composition of 15 wt.% SiO2. From FESEM micrographs, the white granules and aggregate seen on the surface of the samples confirm that SiO2 particles have been successfully dispersed into the PVA-K2CO3 matrix. The observed ionic conductivity increased linearly with increase in temperature confirming the electrolyte as temperature-dependent. Based on the observed performance, it can be concluded that the CPEs based on PVA-K2CO3-SiO2 composites could serve as promising candidate for portable and flexible next generation energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Optimization of the Electrochemical Performance of a Composite Polymer Electrolyte Based on PVA-K2CO3-SiO2 Composite

et al. 2020

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“…The other SNP‐ x electrolytes also showed similar T g as shown in Figure S3 (Supporting Information), which means that the content of ETPTA does not significantly change the T g of SNP‐ x electrolytes with co‐solvent content ranges from 54 wt % to 43 wt %. Low crystallinity can produce large free volume and improve the mobility of polymer segments in polymer electrolyte, [3a,20] and a low T g of polymer matrix benefits to enhance the ionic conduction of the quasi‐solid polymer electrolyte. Furthermore, thermogravimetric analysis (TGA) curve (Figure S4, Supporting Information) shows that the thermal stability of SNP‐30 electrolyte is significantly higher than that of liquid electrolyte (LE, 1.0 M LiPF 6 in EC/DMC).…”

Section: Resultsmentioning

confidence: 99%

“…The two absorption peaks at 1619 and 1637 cm −1 correspond to the stretching vibration of acrylic C=C bonds (1610–1650 cm −1 ) in ETPTA monomer [19] . After UV‐irradiation, the absorption peaks of C=C bonds disappeared, while the absorption peaks at other positions did not change, indicating successful photo‐polymerization of the ETPTA monomer [20] . In addition, the solidifying process of SNP electrolyte was tracked by impedance measurement, as shown in Figure S2 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet‐Cured Semi‐Interpenetrating Network Polymer Electrolytes for High‐Performance Quasi‐Solid‐State Lithium Metal Batteries

Xie

et al. 2021

Chemistry A European J

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Solid polymer electrolytes with relatively low ionic conductivity at room temperature and poor mechanical strength greatly restrict their practical applications. Herein, we design semi‐interpenetrating network polymer (SNP) electrolyte composed of an ultraviolet‐crosslinked polymer network (ethoxylated trimethylolpropane triacrylate), linear polymer chains (polyvinylidene fluoride‐co‐hexafluoropropylene) and lithium salt solution to satisfy the demand of high ionic conductivity, good mechanical flexibility, and electrochemical stability for lithium metal batteries. The semi‐interpenetrating network has a pivotal effect in improving chain relaxation, facilitating the local segmental motion of polymer chains and reducing the polymer crystallinity. Thanks to these advantages, the SNP electrolyte shows a high ionic conductivity (1.12 mS cm−1 at 30 °C), wide electrochemical stability window (4.6 V vs. Li+/Li), good bendability and shape versatility. The promoted ion transport combined with suppressed impedance growth during cycling contribute to good cell performance. The assembled quasi‐solid‐state lithium metal batteries (LiFePO4/SNP/Li) exhibit good cycling stability and rate capability at room temperature.

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“…Therefore, suppression of crystallinity, along with increasing the percentage of the amorphous phase in the PEO matrix, is the design criterion for PEO-based electrolyte. Numerous approaches, that is, dispersion of inorganic fillers, such as SiO 2, 5 TiO 2, 6 Al 2 O 3, 7,8 ZrO 2, 9 MMT, 10 etc, blending the polymer with liquid plasticizers, [11][12][13][14][15][16] mingling with other polymers, 17,18 crosslinking of polymers, 19 copolymerization, 20 etc, have been employed to improve the ionic conductivity of PEO-based electrolytes. It has been observed that incorporation of the liquid plasticizers, such as aprotic carbonated solvents and room temperature ionic liquids (ILs), in the polymer matrices is an effective means to improve the conductivity of those polymer electrolytes.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, suppression of crystallinity, along with increasing the percentage of the amorphous phase in the PEO matrix, is the design criterion for PEO‐based electrolyte. Numerous approaches, that is, dispersion of inorganic fillers, such as SiO 2, 5 TiO 2, 6 Al 2 O 3, 7,8 ZrO 2, 9 MMT, 10 etc, blending the polymer with liquid plasticizers, 11‐16 mingling with other polymers, 17,18 crosslinking of polymers, 19 copolymerization, 20 etc, have been employed to improve the ionic conductivity of PEO‐based electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Ionanofluid plasticized electrolyte with improved electrical and electrochemical properties for high‐performance lithium polymer battery

2020

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Herein, the electrochemical characteristics of Li/LiFePO 4 battery, comprising a new class of poly (ethylene oxide) (PEO) hosted polymer electrolytes, are reported. The electrolytes were prepared using lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) dopant salt and imidazolium ionic liquid-based nanofluid (ionanofluid) as the plasticizer. Morphological, thermophysical, electrical, and electrochemical properties of these newly developed electrolytes were studied. Using FT-IR spectroscopy, the interactions between dopant salt plasticizers and the host polymer, within the electrolytes, were evaluated. The optimized 30 wt% ionanofluid plasticized electrolyte exhibits a room temperature ionic conductivity of 6.33 × 10 −3 S cm −1 , wide electrochemical voltage window (4.94 V vs Li/Li +) along with a moderately high value of lithium-ion transference number (0.47). The values are substantially higher than that of similar wt% IL plasticized electrolyte (7.85 × 10 −4 S cm −1 , 4.44 V vs Li/Li + and 0.28, respectively). Finally, the Li/LiFePO 4 battery, comprising optimized 30 wt% ionanofluid plasticized electrolyte, delivers 156 mAh g −1 discharge capacity at 0.1 C rate and able to retain its 92% value after 50 cycles. Such a superior battery performance as compared to the IL plasticized electrolyte cell (137 mAh g −1 and 84% after 50 cycles at the same current rate) would endow this ionanofluid a very promising plasticizer to develop electrolytes for next-generation lithium polymer battery.

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Cross-linked polymeric ionic liquids ion gel electrolytes by in situ radical polymerization

Cited by 71 publications

References 47 publications

Optimization of the Electrochemical Performance of a Composite Polymer Electrolyte Based on PVA-K2CO3-SiO2 Composite

Optimization of the Electrochemical Performance of a Composite Polymer Electrolyte Based on PVA-K2CO3-SiO2 Composite

Ultraviolet‐Cured Semi‐Interpenetrating Network Polymer Electrolytes for High‐Performance Quasi‐Solid‐State Lithium Metal Batteries

Ionanofluid plasticized electrolyte with improved electrical and electrochemical properties for high‐performance lithium polymer battery

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