Salty Ice Electrolyte with Superior Ionic Conductivity Towards Low‐Temperature Aqueous Zinc Ion Hybrid Capacitors

Sun, Yinglun; Ma, Hongyun; Zhang, Xiaqing; Bao, Liu; Liu, Lingyang; Zhang, Xu; Feng, Jianze; Zhang, Qingnuan; Ding, Yunxia; Yang, Bingjun; Qu, Liangti; Yan, Xingbin

doi:10.1002/adfm.202101277

Cited by 106 publications

(77 citation statements)

References 59 publications

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“…kind of chaotropic anion, also has ability to form a lot of HBs with water molecules due to contain four HBs-acceptor O atoms[24][25][26]. Cations commonly exist in aqueous electrolyte in the form of hydration[27,28].…”

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confidence: 99%

Synergistic Effect of Cation and Anion for Low-Temperature Aqueous Zinc-Ion Battery

et al. 2021

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Although aqueous zinc-ion batteries have gained great development due to their many merits, the frozen aqueous electrolyte hinders their practical application at low temperature conditions. Here, the synergistic effect of cation and anion to break the hydrogen-bonds network of original water molecules is demonstrated by multi-perspective characterization. Then, an aqueous-salt hydrates deep eutectic solvent of 3.5 M Mg(ClO4)2 + 1 M Zn(ClO4)2 is proposed and displays an ultralow freezing point of − 121 °C. A high ionic conductivity of 1.41 mS cm−1 and low viscosity of 22.9 mPa s at − 70 °C imply a fast ions transport behavior of this electrolyte. With the benefits of the low-temperature electrolyte, the fabricated Zn||Pyrene-4,5,9,10-tetraone (PTO) and Zn||Phenazine (PNZ) batteries exhibit satisfactory low-temperature performance. For example, Zn||PTO battery shows a high discharge capacity of 101.5 mAh g−1 at 0.5 C (200 mA g−1) and 71 mAh g−1 at 3 C (1.2 A g−1) when the temperature drops to − 70 °C. This work provides an unique view to design anti-freezing aqueous electrolyte."Image missing"

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confidence: 99%

Synergistic Effect of Cation and Anion for Low-Temperature Aqueous Zinc-Ion Battery

et al. 2021

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“…In addition, the type of electrolyte salt has an important influence on the ion conductivity of the electrolyte at low temperatures. Zn(ClO 4 ) 2 salty ice is least affected by the dramatic drop of ion conductivity caused by the phase separation in frozen aqueous electrolyte [117].…”

Section: Effects Of Anions In Electrolytementioning

confidence: 99%

Recent advances and future perspectives for aqueous zinc-ion capacitors

et al. 2022

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The ion hybrid capacitor is expected to combine the high specific energy of battery-type materials and the superior specific power of capacitor-type materials, being considered as a promising energy storage technique. Particularly, the aqueous zinc-ion capacitors (ZIC) possessing merits of high safety, cost-efficiency and eco-friendliness, have been widely explored with various electrode materials and electrolytes to obtain excellent electrochemical performance. In this review, we first summarized the research progress on enhancing the specific capacitance of capacitor-type materials and reviewed the research on improving the cycling capability of battery-type materials under high current densities. Then, we looked back on the effects of electrolyte engineering on the electrochemical performance of ZIC. Finally, the research challenges and development directions of ZIC have been proposed. This review provides a guidance for the design and construction of the high-performance ZIC.

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“…Gel electrolytes combine the advantages of high ionic conductivity of liquid components and excellent mechanical properties of polymer matrices, which have been the most commonly used electrolytes of flexible energy storage devices [27][28][29][30]. Generally, the anti-freezing property of gel electrolytes could be realized by the addition of organic solvents (e.g., ethylene glycol (EG), glycerol (Gly) and dimethyl sulfoxide) or soluble ions (e.g., sulfuric acid, potassium hydroxide and zinc chloride) with high concentrations [31][32][33][34][35][36][37][38]. These solutes with high concentrations could inhibit the crystallization of water and depress the freezing points of electrolytes.…”

Section: Introductionmentioning

confidence: 99%

An anti-freezing and anti-drying multifunctional gel electrolyte for flexible aqueous zinc-ion batteries

et al. 2022

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Aqueous zinc-ion batteries (ZIBs) have attracted immense attention for flexible energy storage devices due to their high safety and low cost. However, conventional flexible aqueous ZIBs will undergo severe capacity loss at subzero temperature due to the inevitably freeze of electrolytes. In addition, under large bending or stretching strains, the encapsulation of devices would be damaged, which causes the evaporation of water in electrolytes and results in device failure. Herein, an anti-freezing and anti-drying gel electrolyte based on polyacrylamide (PAM) and glycerol (Gly) is developed. The strong hydrogen-bonding interactions between PAM or Gly and water molecules not only avoid the crystallization of the gel electrolyte at low temperatures, but also constrain the free water and restrict its evaporation. Therefore, such gel electrolyte displays a high ionic conductivity of 9.65 × 10 −5 S cm −1 at −40°C. Furthermore, it can restrict the dehydration process when the electrolyte is exposed to ambient environment. The flexible ZIBs based on such gel electrolyte exhibit excellent electrochemical performance at −40°C and the devices without encapsulation retain 98% of their initial capacity in ambient condition after 30 days. This work provides a route to design anti-freezing and anti-drying gel electrolytes for aqueous energy storage devices.

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Salty Ice Electrolyte with Superior Ionic Conductivity Towards Low‐Temperature Aqueous Zinc Ion Hybrid Capacitors

Cited by 106 publications

References 59 publications

Synergistic Effect of Cation and Anion for Low-Temperature Aqueous Zinc-Ion Battery

Synergistic Effect of Cation and Anion for Low-Temperature Aqueous Zinc-Ion Battery

Recent advances and future perspectives for aqueous zinc-ion capacitors

An anti-freezing and anti-drying multifunctional gel electrolyte for flexible aqueous zinc-ion batteries

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