A Robust Hybrid Zn-Battery with Ultralong Cycle Life

Li, Bing; Quan, Junye; Loh, Adeline; Chai, Jianwei; Chen, Ye; Tan, Chaoliang; Ge, Xiaoming; Hor, T. S. Andy; Liu, Zhaolin; Zhang, Hua; Zong, Yun

doi:10.1021/acs.nanolett.6b03691

Cited by 144 publications

(116 citation statements)

References 35 publications

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“…In order to further increase Zn–air battery discharge potential and energy density, concepts of hybridizing Zn–air battery with other Faradic energy storage processes have been explored. The air electrode was designed by loading redox capable metal oxides/hydroxides, such as Co 3 O 4 , MnCo 2 O 4 , or Ni/Co(OH) 2 , as both oxygen electrocatalysts and energy storage materials . Another approach to increase battery discharge potential is by carrying out the oxygen reduction reaction in acidic electrolytes where the standard potential of oxygen reduction is 1.23 V (by four‐electron transfer pathway) .…”

Section: Discussionmentioning

confidence: 99%

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

Chen

Zhou

Karahan

et al. 2018

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The century-old zinc-air (Zn-air) battery concept has been revived in the last decade due to its high theoretical energy density, environmental-friendliness, affordability, and safety. Particularly, electrically rechargeable Zn-air battery technologies are of great importance for bulk applications like electric vehicles, grid management, and portable electronic devices. Nevertheless, Zn-air batteries are still not competitive enough to realize widespread practical adoption because of issues in efficiency, durability, and cycle life. Here, following an introduction to the fundamentals and performance testing techniques, the latest research progress related to electrically rechargeable Zn-air batteries is compiled, particularly new key findings in the last five years (2013-2018). The strategies concerning the development of Zn and air electrodes are in focus. The design of other battery components, namely electrolytes and separators are also discussed. Poor performance of O electrocatalysts and the lack of the long-term stability of Zn electrodes and electrolytes remain major challenges. Finally, recommendations regarding the testing routines and materials design are provided. It is hoped that this up-to-date account will help to shape the future research activities toward the development of practical electrically rechargeable Zn-air batteries with extended lifetime and superior performance.

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Section: Discussionmentioning

confidence: 99%

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

Chen

Zhou

Karahan

et al. 2018

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“…Furthermore, inhomogeneous zinc dissolution and dendritic deposition cause the Zn electrode to change shape and severely limit the cycle life of the cell . Improving the cycling stability of zinc batteries is currently a widely researched topic . Aqueous electrolytes with near‐neutral pH values were proposed as a possible solution to this challenge, and the first steps towards commercialization have been taken.…”

Section: Introductionmentioning

confidence: 99%

Rational Development of Neutral Aqueous Electrolytes for Zinc–Air Batteries

2017

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Neutral aqueous electrolytes have been shown to extend both the calendar life and cycling stability of secondary zinc–air batteries (ZABs). Despite this promise, there are currently no modeling studies investigating the performance of neutral ZABs. Traditional continuum models are numerically insufficient to simulate the dynamic behavior of these complex systems because of the rapid, orders‐of‐magnitude concentration shifts that occur. In this work, we present a novel framework for modeling the cell‐level performance of pH‐buffered aqueous electrolytes. We apply our model to conduct the first continuum‐scale simulation of secondary ZABs using aqueous ZnCl2–NH4Cl as electrolyte. We first use our model to interpret the results of two recent experimental studies of neutral ZABs, showing that the stability of the pH value is a significant factor in cell performance. We then optimize the composition of the electrolyte and the design of the cell considering factors including pH stability, final discharge product, and overall energy density. Our simulations predict that the effectiveness of the pH buffer is limited by slow mass transport and that chlorine‐containing solids may precipitate in addition to ZnO.

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“…[1][2][3][4][5] In addition, the process of assembling zinc-air battery does not require water-free and/or oxygenfree environment, which is in favor of scaling up at low cost. Meanwhile, zincair battery provides a theoretical energy density up to 1086 Wh•kg −1 , even much higher than commercial lithium-ion batteries, promising to next-generation longlasting power system.…”

mentioning

confidence: 99%

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

Chen

Wang

et al. 2019

Advanced Energy Materials

345

296

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remains a challenge. Meanwhile, zincair battery provides a theoretical energy density up to 1086 Wh•kg −1 , even much higher than commercial lithium-ion batteries, promising to next-generation longlasting power system. [1][2][3][4][5] In addition, the process of assembling zinc-air battery does not require water-free and/or oxygenfree environment, which is in favor of scaling up at low cost. [6][7][8][9][10] Therefore, developing stretchable zinc-air batteries with stretchability and weavability will be highly attractive as a power unit for various flexible/wearable devices.The difficulty to develop super-stretchable zinc-air battery is that it must use strong alkaline electrolyte (always 6 m KOH) to achieve decent power density considering all zinc-air batteries with neutral electrolyte possess unacceptable low power output. [11,12] On the other hand, most super-stretchable hydrogels that are considered as an essential component of a stretchable energy storage device will lose their stretchability under such strong alkaline environment. Currently, a zincair battery is typically assembled using polyvinyl alcohol (PVA)-based electrolyte. [2,[13][14][15][16][17] However, the PVA-based electrolyte possesses very poor stretchability (even worse when alkaline electrolyte infiltrated), and meanwhile it shows limited ion-transport capability, resulting in poorly electrochemical performance and mechanical flexibility. [18][19][20][21] Although other hydrogels, such as polyacrylic acid (PAA), polyacrylamide (PAM), show strong water-retention capability and high stretchability, [22,23] unfortunately, they will lose their mechanical robustness, especially the stretchability, when they are incorporated with strong alkaline electrolyte. [24][25][26] Therefore, the absence of alkaline-tolerant hydrogel electrolyte with high stretchability and excellent ion transport capability is the key challenge to fabricate super-stretchable zinc-air battery and enhance its weavability. An alternative way to fabricate stretchable zinc-air battery (very limited stretchability with a maximum strain less than 10%) has been proposed, that is to use electron/ion-inactive stretchable substrate (e.g., rubber elastomer) or strain-accommodating engineering of device structure (e.g., fiber-shaped planar structure). [27][28][29] The problem is that the stretchable components are additional, and they are not involved in any chemical reactions. In some cases, Stretchable devices need elastic hydrogel electrolyte as an essential component, while most hydrogels will lose their stretchability after being incorporated with strong alkaline solution. This is why highly stretchable zinc-air batteries have never been reported so far. Herein, super-stretchable, flat-(800% stretchable) and fiber-shaped (500% stretchable) zinc-air batteries are first developed by designing an alkaline-tolerant dual-network hydrogel electrolyte. In the dualnetwork hydrogel electrolyte, sodium polyacrylate (PANa) chains contribute to the formation of soft domains and the carboxyl gr...

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A Robust Hybrid Zn-Battery with Ultralong Cycle Life

Cited by 144 publications

References 35 publications

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

Rational Development of Neutral Aqueous Electrolytes for Zinc–Air Batteries

Super‐Stretchable Zinc–Air Batteries Based on an Alkaline‐Tolerant Dual‐Network Hydrogel Electrolyte

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