Aqueous Rechargeable Sodium-Ion Batteries Hydrogel

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Aqueous Rechargeable Sodium-Ion Batteries Hydrogel ( aqueous-rechargeable-sodium-ion-batteries-hydrogel )

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ionic crosslinking with some groups such as guluronic acid units in different alginate; not only is the ability to withstand external pressure increased by two hundred times, but also the process of ionic crosslinking is completely reversible. In addition, a comparison of the potential range from −0.7 V to 1.1 V (compared to SCE) was made between Al-algi- Batteries 2022, 8, 180 6 of 23 nate/PAM hydrogel electrolytes, shown in Figure 3c [39]. The dual-crosslinked hydrogel electrolyte can reach an ion conductivity of 29.8 mS cm−1 with the help of dissolved Li2SO4, which is higher than that of many reported gel electrolytes [37]. cm−1 with the help of dissolved Li2SO4, which is higher than that of many reported gel electrolytes [37]. Figure 3. (a) Optical image of hydrogel electrolytes at 25 ◦C and −20 ◦C and electrochemical Figure 3. (a) Optical image of hydrogel electrolytes at 25 °C and −20 °C and electrochemical per- performance of full flexible battery. Reproduced with the permission of ref. [37], copyright 2021 formance of full flexible battery. Reproduced with the permission of ref. [37], copyright 2021 Else- Elsevier B.V. (b) PAM and SL−PAM hydrogels in zinc ion batteries: compressibility and stress−strain curves. Reproduced with the permission of ref. [38], copyright 2021 Elsevier Inc. (c) Analyses of vier B.V. (b) PAM and SL−PAM hydrogels in zinc ion batteries: compressibility and stress−strain the mechanical (I, II and III ) and electrochemical properties of the Al-alginate/PAAm hydrogels. curves. Reproduced with the permission of ref. [38], copyright 2021 Elsevier Inc. (c) Analyses of the Reproduced with the permission of ref. [39], copyright 2019 Elsevier Ltd. (d) Electrochemical and mechanical (I, II and III ) and electrochemical properties of the Al-alginate/PAAm hydrogels. Re- cut−heal test under different conditions including bending, twisting and stretching at high strains. produced with the permission of ref. [39], copyright 2019 Elsevier Ltd. (d) Electrochemical and Reproduced with the permission of ref. [40], copyright 2019 WILEY−VCH. cut−heal test under different conditions including bending, twisting and stretching at high strains. As we know, the low-temperature electrochemical performance of aqueous batteries Reproduced with the pdeorems nisostiodno oasf wreefl.l [a4s0a],t croopmyrtiegmhtpe2r0a1tu9rWe. ITLhEeYs−tanVdCarHd .aqueous solution and most polymer hydrogels, such as guar gum (GG) and sodium alginate (SA), freeze at sub- zero temperatures, resulting in significantly limited functionality. As shown in Figure 3a, As we know, the low-temperature electrochemical performance of aqueous batteries antifreeze hydrogel electrolyte can better solve this problem. Utilization of ethylene glycol does not do as wellasasanaatdrdoitoivme intetmhepperreapaturarteio.nTohf eGGst/aSnAd/aetrhdyleanqeugleyocoul(sEGso) lhuytdiorongeal ncadn mgreoastlty improve the frost resistance of hydrogels. The flexible full cells can still maintain a great polymer hydrogels, such as guar gum (GG) and sodium alginate (SA), freeze at sub-zero ionic conductivity at −20 ◦C [37]. With regard to the current trend in the development of portable devices, greater stretchability and self-healing properties are also essential for improving the practica- bility and reliability of batteries in portable and wearable electronic devices [40]. The introduction of self-healing hydrogels into flexible portable devices undoubtedly pro- vides feasibility for the recycling of equipment, especially for hydrogels with sufficiently fast self-healing properties, as shown in Figure 3d; after being disconnected by external force, part of its performance can be restored in a short time. Although it takes several hours to achieve close to complete recovery, application to flexible wearable devices that are often exposed to extreme external environments is equivalent to increasing the service life of the power supply part of the flexible electronic device. At the same time, due to the choice of water for the hydrogel solvent, its self-healing properties are more clearly manifested after water wets the damaged interface [41]. In addition, most of the hydrogels that are used as hydrogel electrolyte also have unique cell affinity and

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