Nanostructured Polymer Electrolytes for Lithium-Ion Batteries

Yoon, Jeong Hoon; Cho, Won-Jang; Kang, Tai‐Hee; Lee, Minjae; Yi, Gi‐Ra

doi:10.1007/s13233-021-9073-9

Cited by 24 publications

(19 citation statements)

References 73 publications

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“…[3][4][5] Electrolytes play a role in generating current by moving anions and cations in opposite directions within the electrolyte. [6,7] Liquid electrolytes have been widely used due to their high ionic conductivities (10 −3 -10 −2 S cm −1 at 25 °C) and good wettability with electrodes, ensuring efficient charge carrier characteristics. [8] DOI: 10.1002/macp.202200460 Supercapacitor based on aqueous electrolytes has a narrow operating voltage range, whose potential window is ≈1.23 V. [9] This limits applications for high energy and power densities needed.…”

Section: Introductionmentioning

confidence: 99%

High Ion Conducting Dobule Network Crosslinked Gel Polymer Electrolytes for High‐Performance Supercapacitors

Lee

Choi

2023

Macro Chemistry & Physics

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As the demand for electrical energy storage devices increases, various electrolytes are being studied. In particular, gel polymer electrolytes (GPEs) with excellent physical properties can improve safety and cycle life, so attempts are underway to replace organic liquid electrolytes facing fire or explosion issues. However, the intrinsic poor electrochemical properties of GPEs limit their commercialization in all-solid-state energy storage devices. In an attempt to solve this problem, epoxy/poly(ethylene glycol) (PEG)-based double network electrolytes (DNEs) containing a mixture of bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) are designed to enhance the electrochemical properties of traditional single network electrolytes (SNEs). The synthesized epoxy/PEG-based DNE has higher mechanical strength (G′ = 1.7 MPa) with outstanding ionic conductivity (𝝈 DC ≈ 5.8 × 10 −4 S cm −1 ) at room temperature, compared to the epoxy-based SNE. Then, an all-solid-state supercapacitor based on the DNE and activated carbon electrodes exhibits higher specific capacitance (≈153 F g −1 ) and power density (833 W kg −1 ), compared to the SNE-based supercapacitor.

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Section: Introductionmentioning

confidence: 99%

High Ion Conducting Dobule Network Crosslinked Gel Polymer Electrolytes for High‐Performance Supercapacitors

Lee

Choi

2023

Macro Chemistry & Physics

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“…7 Therefore, for the rational design of flexible supercapacitors, it is necessary to develop mechanically and environmentally safe alternative electrolytes, that is, solidstate electrolytes that can withstand extreme deformations (bending and folding) and climate change (severe high-and low-temperature regions) and maintain stable performances. 8,9 Hydrogel (an elastic, 3D cross-linked polymer network with high water holding capacity)-based electrolytes, 10 with mechanical tunability to solid electrolytes and comparable ionic conductivity to liquid electrolytes, are promising candidates for flexible supercapacitors. This is because the hydrogel network has a mesh in a tens-of-nanometers scale that is larger than that of water molecules, so the water molecules in hydrogels can have the same physical properties as liquid water, and the effect on ionic conductivity is negligible.…”

Section: Introductionmentioning

confidence: 99%

Ionic Conduction and Dielectric Response of Nanoparticle-Coupled Hydrogel Network Polymer Electrolytes

et al. 2023

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The molecular level understanding of ion and polymer dynamics in nanoparticle-coupled hydrogel network polymer electrolytes is investigated by linear dielectric and viscoelastic measurements covering broad ranges of frequency and temperature. We prepare hydrogel polymer electrolytes (HPEs), composed of Li + conducting hydrophilic poly(lithium acrylate) (PLiA) as the HPE matrix and vinyl-functionalized silica nanoparticles (NPs) as cross-linking points, via radical polymerization and sol−gel reaction. The NP content variation leads to changes in ionic conductivity (σ DC ), dielectric constant (ε s ), relaxation frequency, and elastic modulus, which are important characteristic factors for understanding ion transport. From the physical model of electrode polarization (EP), allowing for the determination of the number density of simultaneously conducting ions and their mobility, the NP-containing HPEs (HPE-NP) have simultaneously higher conducting ion concentration (p) and mobility (μ), resulting in higher ionic conductivity (σ DC ∼ pμ), compared to the HPE without NPs. The temperature dependence of p and μ follows Arrhenius (thermally activated) and Vogel−Fulcher (segmentally driven) temperature dependences, respectively. In addition to the lower frequency EP, the HPEs show higher frequency relaxation (α 2 ), attributed to ions rearranging. NP incorporation leads to faster α 2 relaxation and higher static dielectric constant ε s (shorter Bjerrum length l B ). Time−temperature superposition (tTS) works well for these electrolytes and is applied to construct master curves of viscoelasticity and in-phase conductivity. In the end, the NP-containing HPE-based supercapacitor is fabricated using carbon nanotube yarn (CNTY) electrodes and shows stable electrochemical performance, demonstrating that our HPE can be a solid-state polymer electrolyte for energy storage devices.

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“…In 2021, Gao et al produced 421 GW h LIBs, and the production has been rapidly growing at a record growth rate of approximately 17%. In addition, it has been reported that LIB sales are expected to surge from 70 million units in 2020 to 180 million units in 2045. , However, the current achievable energy density of LIBs is 250–300 W h kg –1 , which is not sufficient to meet the demands of large-scale energy storage devices such as EVs. − Many studies have been conducted to design a LIB with a high-capacity/high-output system, focusing on its core components, namely, the cathode, anode, electrolyte, and separator. − However, a long-term cycling stability research is important. Exploration of the core materials for achieving long-term cycling is being conducted; however, alternative core materials investigated to date have structural limitations. − As a result, it is crucial to investigate batteries that exhibit long-term cycling stability based on the solution of the cell’s fundamental issue.…”

Section: Introductionmentioning

confidence: 99%

Microbial-Copolyester-Based Eco-Friendly Binder for Lithium-Ion Battery Electrodes

Yoon

Han

Cho

et al. 2023

ACS Appl. Polym. Mater.

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Extensive research has been conducted in order to enhance the capacities of Li-ion batteries (LIBs). However, there is limited research on binders which are one of the main electrode components that contribute to the long life cycle of LIBs. Improving the binder properties enhances both long-term cycling performance and battery life. In this study, amorphous polyhydroxyalkanoate (aPHA), poly(3-hydroxybutyrate-co-4-hydroxybutyrate), with a 4-hydroxybutyric acid content of approximately 47%, was used as a novel eco-friendly binder material. aPHA is an affinity polymer material synthesized by microorganisms and is suitable as a binder because of its electrochemical and thermal stability over the operating voltage and temperature ranges of LIBs. aPHA allowed strong adhesion between the active material and the current collector and maintained the structural stability of the electrode even after long-term cycling owing to its elastic properties. In addition, the high wettability of the aPHA binder toward the electrolyte reduced the resistance of the electrode, providing a shortened diffusion path for Li ions. As a result, aPHA exhibited a superior capacity over the commercially available polyvinylidene fluoride binder and displayed capacity retention with a high Coulombic efficiency (CE) of over 94% for 100 cycles. The PHA content was reduced from 10% to 5% by weight relative to that of the electrode, while the active material content was increased. The use of the aPHA binder increased the capacity and capacity retention with a CE of 94.1% over 100 cycles, indicating its potential as a next-generation eco-friendly binder for LIBs.

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Nanostructured Polymer Electrolytes for Lithium-Ion Batteries

Cited by 24 publications

References 73 publications

High Ion Conducting Dobule Network Crosslinked Gel Polymer Electrolytes for High‐Performance Supercapacitors

High Ion Conducting Dobule Network Crosslinked Gel Polymer Electrolytes for High‐Performance Supercapacitors

Ionic Conduction and Dielectric Response of Nanoparticle-Coupled Hydrogel Network Polymer Electrolytes

Microbial-Copolyester-Based Eco-Friendly Binder for Lithium-Ion Battery Electrodes

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