Non-concentrated aqueous electrolytes with organic solvent additives for stable zinc batteries

Dong, Yang; Miao, Licheng; Ma, Guoqiang; Di, Shengli; Wang, Yuanyuan; Wang, Liubin; Xu, Jin-Quan; Zhang, Ning

doi:10.1039/d0sc06734b

Cited by 297 publications

(247 citation statements)

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“…4c). Compared with the reported literature in Table S2, [7,14,16,[27][28][29] the ASE also shows better performance in the first-cycle and cycling CEs. Thed endritic growth in Zn plating process also hinders the practicability of aqueous Zn batteries.During Zn plating process,the Zn tips adsorb cation owing to that the sharp edge on the electrode exhibits as tronger electrical field, which enhances the dendritic growth.…”

Section: àmentioning

confidence: 65%

Designing Anion‐Type Water‐Free Zn²⁺ Solvation Structure for Robust Zn Metal Anode

Zhang

Lü

et al. 2021

Angewandte Chemie

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Rechargeable aqueous Zn batteries are potential for large‐scale electrochemical energy storage due to their low cost and high security. However, Zn metal anode suffers from the dendritic growth and interfacial hydrogen evolution reaction (HER), resulting in the deterioration of electrode/battery performance. Here we propose that both dendrites and HER are related to the water participated Zn2+ solvation structure‐Zn(H2O)62+ and thus can be resolved by transforming Zn(H2O)62+ to an anion‐type water‐free solvation structure‐ZnCl42−, which is achieved in traditional ZnSO4 aqueous electrolyte after adding chloride salt with a bulky cation (1‐ethyl‐3‐methylimidazolium chloride). The elimination of cation‐water interaction suppresses HER, while the electrostatic repulsion between Zn tips and the anion solvation structure inhibits dendrite formation. As a result, the electrolyte shows uniform Zn deposition with an average Zn plating/stripping Coulombic efficiency of ≈99.9 %, enabling a capacity retention of 78.8 % after 300 cycles in anode‐free Zn batteries with pre‐zincificated polyaniline as the cathode. This work provides a novel electrolyte design strategy to prevent HER and realize long‐lifespan metal anode.

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Section: àmentioning

confidence: 65%

Designing Anion‐Type Water‐Free Zn²⁺ Solvation Structure for Robust Zn Metal Anode

Zhang

Lü

et al. 2021

Angewandte Chemie

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“…Zhang et al designed a hybrid electrolyte composed of 2 m Zn(CF3SO 3 ) 2 (Zn(OTf) 2 ) in different ratios of water and dimethyl carbonate (DMC) solvents. [153] Water and DME are immiscible intrinsically (Figure 11h). The oleophilic and hydrophilic components in (Zn(OTf) 2 ) make the hybrid electrolyte into a homogeneous one (Figure 11i).…”

Section: Aqueous Electrolytesmentioning

confidence: 99%

“…However, non-aqueous electrolytes are usually characterized by higher viscosity, higher price, lower conductivity, and much bigger electrolyte ions than aqueous electrolytes. Hybrid electrolytes that are composed of low-cost, high-concentration alkali-metalion electrolytes and zinc-ion electrolytes, such as Na + and Zn 2+ hybrid ion electrolyte [243] or hybrid solvent electrolyte, [153,244] may be good solutions.…”

Section: Electrolytesmentioning

confidence: 99%

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Electrochemical Zinc Ion Capacitors: Fundamentals, Materials, and Systems

Yin

Zhang

Alhebshi

et al. 2021

Advanced Energy Materials

174

111

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An electrochemical zinc ion capacitor (ZIC) is a hybrid supercapacitor composed of a porous carbon cathode and a zinc anode. Based on the low‐cost features of carbon and zinc metal, ZIC is a potential candidate for safe, high‐power, and low‐cost energy storage applications. ZICs have gained tremendous attention in recent years. However, the low energy densities and limited cycling stability are still major challenges for developing high‐performance ZICs. First, the energy density of ZIC is limited by the low capacitance of porous carbon cathodes. Second, aqueous electrolytes induce parasitic reactions, which results in limited voltage windows and poor cycling performances of ZICs. Third, the poor stabilities and low utilization of zinc anodes remain major challenges to develop practical ZICs. This review summarizes the recent progress in developing ZICs and highlights both the promising and challenging attributes of this emerging energy storage technology. Future research directions are proposed for developing better, lower cost, and more scalable ZICs for energy storage applications.

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“…As shown in Supplementary Figure 9 and Figure 3b, the Zn||Zn cell in ZnSO4-H2O-DMF (4:2) electrolyte achieved a stable operating status of over 1400 h at 2 mA cm -2 and 1000 h at 4 mA cm -2 , respectively, with the specific capacity of 1 mA h cm -2 . As compared to the cycling performances of symmetrical cells plotting the cumulative capacities of Zn||Zn cells as shown in Figure 3c (based on the data summarized in Supplementary Table 4), ZnSO4-H2O-DMF (4:2) electrolyte surpasses the values of most of the previous works at different current densities using the electrolyte optimization strategies 12,13,[16][17][18][19][20][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] . Figure 3d and Supplementary Figure 10 exhibit the rate capability of the symmetric cells in hybrid and ZnSO4-H2O electrolytes at an area capacity of 1 mA h cm -2 .…”

Section: High Zn/zn 2+ Reversibility and Uniform Zn Depositsmentioning

confidence: 99%

Solvation Structure and Interfacial Regulation for Extremely Stable Zinc Metal Anodes Operating in a Wide Range of Temperatures

Kang

Yao

Chen

et al. 2021

Preprint

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Aqueous zinc-metal batteries are promising for large-scale energy storage owing to their reasonable energy density, safety and low cost. However, their practical applications are limited by hydrogen evolution, corrosion, and dendrite formation of Zn anode and there is trade-off between efficiency and stability at high and low temperatures. Herein, we propose a solvation chemistry regulation strategy that can adjust the Zn2+-solvation structure and in situ form a robust and Zn2+-conducting Zn5(CO3)2(OH)6 SEI on the Zn surface, using hybrid electrolytes of water and a polar aprotic N, N-dimethylformamide. As verified by experimental characterizations and computational analyses, the unique solvation structure and the newly formed solid electrolyte interface are created by hybrid electrolytes, resulting in highly reversible and dendrite-free Zn plating/stripping process as well as thermal stability and high ionic conductivity from −30 to 70 °C. The Zn||Zn symmetric cells in hybrid electrolytes are very stable over 2500 h at 25 ℃ and 2000 h even at –20 ℃. Thus, the stability and reversibility of the hybrid zinc-ion capacitors with Zn metal anode in hybrid electrolytes are firstly achieved in a wide and extreme temperature range, demonstrating high capacity retentions and Coulombic efficiencies over 14000, 10000, and 600 cycles at 25, −20, and 70 ℃, respectively.

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Non-concentrated aqueous electrolytes with organic solvent additives for stable zinc batteries

Abstract: Rechargeable aqueous zinc batteries (RAZBs) are promising for large-scale energy storage because of superiority in addressing cost and safety concerns. However, their practical realization is hampered by the issues including...

Cited by 297 publications

References 50 publications

Designing Anion‐Type Water‐Free Zn²⁺ Solvation Structure for Robust Zn Metal Anode

Designing Anion‐Type Water‐Free Zn²⁺ Solvation Structure for Robust Zn Metal Anode

Electrochemical Zinc Ion Capacitors: Fundamentals, Materials, and Systems

Solvation Structure and Interfacial Regulation for Extremely Stable Zinc Metal Anodes Operating in a Wide Range of Temperatures

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Non-concentrated aqueous electrolytes with organic solvent additives for stable zinc batteries

Abstract: Rechargeable aqueous zinc batteries (RAZBs) are promising for large-scale energy storage because of superiority in addressing cost and safety concerns. However, their practical realization is hampered by the issues including...

Cited by 297 publications

References 50 publications

Designing Anion‐Type Water‐Free Zn2+ Solvation Structure for Robust Zn Metal Anode

Designing Anion‐Type Water‐Free Zn2+ Solvation Structure for Robust Zn Metal Anode

Electrochemical Zinc Ion Capacitors: Fundamentals, Materials, and Systems

Solvation Structure and Interfacial Regulation for Extremely Stable Zinc Metal Anodes Operating in a Wide Range of Temperatures

Contact Info

Product

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Designing Anion‐Type Water‐Free Zn²⁺ Solvation Structure for Robust Zn Metal Anode

Designing Anion‐Type Water‐Free Zn²⁺ Solvation Structure for Robust Zn Metal Anode