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Iontogel 3
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1. Energy density
Ionogels are a 3D polymer network containing ionic fluids. They have excellent electrochemical, chemical, and thermal stability. They exhibit nonflammability, negligible vapor pressure, and a large potential window, making them ideal for supercapacitors. Furthermore, the presence Ionic liquids inside their structure endows them with mechanical strength. Ionogels can be used without encapsulation, and they are compatible with harsh conditions such as high temperatures.
They are therefore a promising candidate for wearable and portable electronics. However, they suffer from incompatibility with electrodes due their large ion size and high viscosity, which leads to slow ionic diffusion and diminution in capacitance over time. To overcome this limitation, researchers incorporated ionogels into solid-state capacitors (SC) to achieve high energy density and long durability. The resulting iontogel based SCs outperformed previous ILs and gel-based ILSCs.
To fabricate the iontogel-based SCs, 0.6 g of the copolymer P(VDF-HFP) was mixed with 1.8 g of the hydrophobic EMIMBF4 ionic liquid (IL). The solution was then poured onto a Ni-based film and sandwiched between MCNN/CNT/CNT films and CCNN/CNT/CNT/CNT film, which were utilized as negative and positive electrodes. The ionogel electrode was evaporated in a glovebox filled with Ar, resulting in an FISC that was symmetrical with a 3.0 V potential window.
The FISCs based on iontogel demonstrated an excellent endurance with a retention of up 88% after 1000 cycles in straight and bending conditions. In addition, they displayed excellent stability, sustaining an even potential window when bending. These results indicate that iontogels are a reliable and long-lasting alternative to conventional electrolytes made of ionic liquids. they may pave the way for future development of solid-state flexible lithium-ion supercapacitors. Moreover, these iontogel-based FISCs can be easily customized to meet the needs of different applications. ion togel can be designed to fit the dimensions of the device and they can be used for charging and discharging under different bending angles. This makes them a great candidate for applications in which the dimension of the device is limited and the bending angle is not fixed.
2. Ionic conductivity
The Ionic conductivity of ionogels may be greatly affected by the structure of the polymer network. A polymer with high crystallinity and a high Tg has more conductivity than one with a low Tg or crystallinity. Therefore, iontogels that have high Ionic conductivity are needed for applications that require electrochemical performance. Recently, we have successfully prepared a self-healable ionogel with excellent mechanical properties and a high ionic conductivity. This new ionogel is prepared by locking ionic liquids, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM TFSI), into poly(aminopropyl-methylsiloxane) grafted with [2-(methacryloyloxy)ethyl] trimethylammonium chloride (METAC), in the presence of tannic acid (TA). The result is an unidirectional crosslinked system that is completely physical, composed of ionic clusters between METAC, TA and PAPMS and hydrophobic networks between TA, PAPMS and iontogel 3
The chemically crosslinked ionogel has excellent mechanical properties, including high elastic strain to break and high strain recovery. It also has good thermal stability, and an ionic conductivity of up to 1.19mS cm-1 at 25 degrees Celsius. It is also capable of healing completely within 12 hours at room temperature, with a maximum recovery of 83%. This is because of a fully physical dual crosslinked network between METAC and TA as well as hydrogen bonding between iontogel3 and the TA.
Additionally we have been able to alter the mechanical properties of ionogels by using different ratios of trithiol crosslinker and dithiols within the material that is used as the starting. By increasing the concentrations of dithiols, we can reduce the density of crosslinking networks in ionogels. We also discovered that altering the thiolacrylate concentration has a significant effect on the ionogel's polymerization kinetics and mechanical properties.
Additionally Ionogels have been observed to have good dynamic viscoelasticity with storage modulus that ranges from 105 Pa to 105 Pa. The Arrhenius plots of the ionic liquid BMIMBF4 and ionogels that have varying contents of hyperbranched polymer show typical rubberlike behavior, where the storage modulus becomes independent of frequency over the investigated temperature range. The ionic conductivity is also independent from frequency, which is important for applications as solid state electrolytes.
3. Flexibility
Ionogels consisting of ionic liquid and polymer substrates have excellent stability and superior electrical properties. They are promising materials that could be used in iontronic devices such as triboelectric-based microgenerators, thermoelectric ionic materials and strain sensors. Their flexibility is a major issue. We have developed a flexible, ionic-conductive ionogel that can self-heal by the reversible weak and strong interactions. The ionogel is highly resistant to stretching and shear forces and can be stretched up to 10 times its original size, without losing the ionic conducting properties.
The ionogel is composed of an acrylamide monomer with a carboxyl-linked polyvinylpyrrolidone chain (PVDF). It is easily soluble in ethanol, water and Acetone. It has a high modulus of 1.6MPa and break length of 9.1 percent. Solution casting is a simple method of coating the Ionogel on non-conductive surfaces. It is also a viable option for a supercapacitor based on ionogel, since it has a specific capacity of 62 F g-1 with a current density of 1 A g-1 and excellent cyclic stability.
Additionally the ionogel has the capability to generate electromechanical signals at an extremely high frequency and magnitude, as demonstrated by the paper fan as an example of a flexible strain sensor (Fig. 5C). Furthermore, if the ionogel-coated paper is folded repeatedly and closed like an accordion and then closed, it can produce reproducible and stable electromechanical responses.
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4. Healability
The unique properties of Iontogel 3 make it a great material for a variety of applications. These include information security, electronic devices that are soft and wearable and energy harvesters that convert mechanical energy to electrical energy (e.g.). Ionogels are translucent and self-healing when the reversible reaction of crosslinking is controlled in a controlled manner.
To prepare ionogels, a block copolymer of poly(styrene)-b-poly(N,N-dimethylacrylamide-r-acrylic acid) (P(St)-b-P(DMAAm-r-AAc)) is cast into an ionic liquid (IL) and crosslinked using the thermoresponsive Diels-Alder reaction. The resulting ionogels have high tensile strength, ionic conductivity, and resilience while also possessing a large thermal stability window.
For a more advanced application, the ionogels were doped with carbon quantum dots through dynamic covalent cross-linking of chitosan with glutaraldehyde and chemical cross-linking of acrylamide in 1-ethyl-3-methylimidazolium chloride (EMIMCl). By taking advantage of the ionic dipole interaction between DMAAm r AAc block, ionogels are able to be made into an elastic and stretchable elastomer. Ionogels were also observed to exhibit excellent transparency and self-healing properties when stretched cyclically.
Similarly, another approach to endow materials with self-healing capabilities is to utilize photo-responsive chromophores that create dimers when exposed to light using [2-2 and [4-4] cycloaddition reactions as shown in Figure 8b. This method allows the creation of Ion block copolymer gels that are reversible that self heal by simply heating the dimers back to their initial state.
Another benefit of these bonds is that they eliminate the need for costly crosslinking agents, and allows for simple modification of the material's properties. The ability to control the reversible crosslinking reaction makes ionogels adaptable and suitable for both industrial and consumer applications. Additionally, these ionogels can be designed to function at various temperatures by altering the concentration of the ionic liquid and the conditions for synthesis. Self-healing Ionogels are able to be used in space as they can maintain their shape and ionic conductivity properties at low vapor pressures. Further research is required to create self-healing ionogels that are stronger and more durable. To provide adequate protection from environmental stressors, ionogels could be strengthened with rigid materials like carbon fibres or cellulose.
Read More: https://potofu.me/iontogel
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