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Open accessJournal ArticleDOI: 10.1021/ACSAMI.1C00012

Self-Healing and Anti-CO2 Hydrogels for Flexible Solid-State Zinc-Air Batteries.

04 Mar 2021-ACS Applied Materials & Interfaces (American Chemical Society (ACS))-Vol. 13, Iss: 10, pp 12033-12041
Abstract: Flexible solid-state zinc-air batteries (ZABs) generally suffer from poor electrolyte/electrode contact and mechanical degradation in practical applications. In addition, CO2 corrosion is also a common issue for ZABs with alkaline electrolyte. Herein, we report a thermoreversible alkaline hydrogel electrolyte that can simultaneously solve the aforementioned problems. Through a simple cooling process, the hydrogel electrolyte transforms from solid state to liquid state that can not only restore the deformed electrolyte layer to its original state but also rebuild intimate contact between electrode and electrolyte. Moreover, the ZAB based on this hydrogel electrolyte exhibits an unprecedented anti-CO2 property. As a result, such a battery shows almost 2.5 times discharge duration than that of ZAB based on liquid electrolyte.

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Topics: Electrolyte (58%), Zinc–air battery (51%), Battery (electricity) (50%) ... show more

6 results found

Journal ArticleDOI: 10.1016/J.MTCHEM.2021.100538
Pengfei Zhang1, Keliang Wang1, Keliang Wang2, Pucheng Pei2  +5 moreInstitutions (2)
Abstract: Flexible zinc–air batteries attract more attention due to their high energy density, safety, environmental protection, and low cost. However, the traditional aqueous electrolyte has the disadvantages of leakage and water evaporation, which cannot meet application demand of flexible zinc–air batteries. Hydrogels possessing good conductivity and mechanical properties become a candidate as the electrolytes of flexible zinc–air batteries. In this work, advances in aspects of conductivity, mechanical toughness, environmental adaptability, and interfacial compatibility of hydrogel electrolytes for flexible zinc–air batteries are investigated. First, the additives to improve conductivity of hydrogel electrolytes are summarized. Second, the measures to enhance the mechanical properties of hydrogels are taken by way of structure optimization and composition modification. Third, the environmental adaptability of hydrogel electrolytes is listed in terms of temperature, humidity, and air composition. Fourth, the compatibility of electrolyte–electrode interface is discussed from physical properties of hydrogels. Finally, the prospect for development and application of hydrogels is put forward.

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Topics: Self-healing hydrogels (55%)

3 Citations

Journal ArticleDOI: 10.1016/J.MTENER.2021.100823
Keliang Wang1, Keliang Wang2, Yayu Zuo2, Pucheng Pei1  +5 moreInstitutions (2)
Abstract: Zinc-air batteries would be a promising candidate for energy conversion and storage because of their dense energy and effective cost. The metal nickel is extensively used for current collection and framework support of the air electrode in consideration of its outstanding anticorrosion property and conductivity . However, the reaction of zinc and nickel in zinc-air batteries has not been reported. Here, we show a novel zinc-air battery with a reverse structure of the air electrode based on Zn–Ni reaction, where nickel foam of the air electrode is oriented toward the zinc electrode, protecting the catalytic layer of the air electrode from impurity coverage and inhibiting dendrite growth. A zinc-air primary battery with the reverse air electrode exhibits a stable discharging ability of >1000 h around 1.4 V, achieving a capacity of 0.73 A h g Zn−1 and a specific energy of 874 W h kgZn−1. Moreover, a zinc-air secondary battery with the reverse air electrode obtains more than 700 h cycles at the current density of 10 mA/cm2 without battery failure.

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Topics: Battery (electricity) (61%), Zinc–air battery (59%), Electrode (55%) ... show more

2 Citations

Journal ArticleDOI: 10.1016/J.CEJ.2021.132718
Siyuan Zhao1, Tong Liu1, Yawen Dai1, Yang Wang1  +5 moreInstitutions (2)
Abstract: The low operating voltage of 1.4 V limits the widespread application of flexible Zn-air batteries (ZABs) in wearable electronics. However, a high-voltage flexible ZAB has not been achieved yet, which results from the few choices of fitted flexible electrolytes. Now we propose a novel, universal, and simple strategy to design all-in-one and membrane-free acid-alkaline flexible electrolytes based on thermo-reversible Pluronic® F127 hydrogels. Benefiting from the unique sol–gel transition property of Pluronic® F127 hydrogel, the acid and alkaline can be decoupled but integrated simultaneously in one hydrogel. Surprisingly, the as-developed ZAB achieves an unprecedentedly high voltage of 2 V, surpassing all the existing flexible ZABs. Meanwhile, this battery exhibits remarkable high-voltage stability of 37 h and a large area capacity of 1.35 mAh cm−2 without the use of costly bipolar membranes. Our work presents a pioneering example for flexible high-voltage ZAB and may further inspire other designs of flexible high-voltage aqueous batteries and decoupled dual-electrolyte batteries.

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42 results found

Open accessJournal ArticleDOI: 10.1002/AENM.201000010
Jang-Soo Lee1, Sun Tai Kim1, Ruiguo Cao1, Nam-Soon Choi1  +3 moreInstitutions (2)
Abstract: In the past decade, there have been exciting developments in the field of lithium ion batteries as energy storage devices, resulting in the application of lithium ion batteries in areas ranging from small portable electric devices to large power systems such as hybrid electric vehicles. However, the maximum energy density of current lithium ion batteries having topatactic chemistry is not sufficient to meet the demands of new markets in such areas as electric vehicles. Therefore, new electrochemical systems with higher energy densities are being sought, and metal-air batteries with conversion chemistry are considered a promising candidate. More recently, promising electrochemical performance has driven much research interest in Li-air and Zn-air batteries. This review provides an overview of the fundamentals and recent progress in the area of Li-air and Zn-air batteries, with the aim of providing a better understanding of the new electrochemical systems.

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Topics: Zinc–air battery (63%), Electrochemical energy conversion (60%), Energy storage (57%) ... show more

1,587 Citations

Journal ArticleDOI: 10.1063/1.555581
Abstract: The paper re‐analyzes the results of earlier, very precise measurements of the viscosity of water at essentially atmospheric pressure. This is done in terms of a new, theoretically‐based equation for the operation of a capillary viscometer rather than in terms of semi‐empirical equations used by the original authors. The new analysis eliminates possible systematic errors and permits the establishment of realistic error bounds for water in its role as a standard reference substance for viscosity. The latter are smaller than those embodied in the most recent International Formulation. Standard values of the ratio of viscosity at a temperature T to its value at 20 °C have been derived from the re‐analyzed data because the uncertainty of this ratio is an order of magnitude smaller than that of the absolute values. The ratios are used to generate absolute values with the aid of the standard NBS datum μ=1002.0 μPa s at 20 °C. The viscosity ratios have been correlated with the aid of two empirical equations. The more accurate equation covers the range 0 °C?t ?40 °C with an uncertainty of ±0.05%. The less accurate equation covers the wider range −8 °C?t?150 °C with the more limited accuracy of ±0.2%. The two empirical equations are compatible with each other to 0.09%.

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Topics: Relative viscosity (57%), Viscometer (56%), U.S. Standard Atmosphere (56%) ... show more

717 Citations

Journal ArticleDOI: 10.1016/J.JPOWSOUR.2015.02.054
Abstract: Conventional lithium-ion liquid-electrolyte batteries are widely used in portable electronic equipment such as laptop computers, cell phones, and electric vehicles; however, they have several drawbacks, including expensive sealing agents and inherent hazards of fire and leakages. All solid state batteries utilize solid state electrolytes to overcome the safety issues of liquid electrolytes. Drawbacks for all-solid state lithium-ion batteries include high resistance at ambient temperatures and design intricacies. This paper is a comprehensive review of all aspects of solid state batteries: their design, the materials used, and a detailed literature review of various important advances made in research. The paper exhaustively studies lithium based solid state batteries, as they are the most prevalent, but also considers non-lithium based systems. Non-lithium based solid state batteries are attaining widespread commercial applications, as are also lithium based polymeric solid state electrolytes. Tabular representations and schematic diagrams are provided to underscore the unique characteristics of solid state batteries and their capacity to occupy a niche in the alternative energy sector.

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450 Citations

Journal ArticleDOI: 10.1063/1.446209
Abstract: A simple microscopic model for micellar formation in mixtures of block copolymers and homopolymers is presented. The size, number of chains, and energy of formation of micelle are calculated. The fraction of copolymer chains aggregating into micelles is computed as a function of the overall copolymer content. A critical micelle concentration behavior is found for low copolymer contents even for weak incompatibilities of species. The similarity with an aborted phase transition is underlined.

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Topics: Aggregation number (67%), Micelle (66%), Critical micelle concentration (65%) ... show more

331 Citations

Journal ArticleDOI: 10.1016/J.APENERGY.2014.04.095
Pucheng Pei1, Keliang Wang1, Ze Ma1Institutions (1)
01 Sep 2014-Applied Energy
Abstract: Zinc–air batteries are devices which convert chemical energy into electrical energy and vice versa during charge/discharge. Zinc–air battery has been used for a long time due to its high energy density, great availability and low-level pollution, and zinc–air primary battery has already commercialized in hearing aids, navigation lights, and railway signals so forth; while the problem of cyclelife limits rechargeable zinc–air battery applied to the fields of transportation and energy storage. To thoroughly understand the nature of electrically rechargeable zinc–air battery, we have made detailed failure mechanism investigations of zinc electrode, air electrode, electrolyte, and separator; meanwhile research progress of a rechargeable zinc–air battery respectively based on bifunctional air electrode and triple electrodes described in this work have been analyzed in comparison. Furthermore, working conditions including air system, electrolyte system and charge–discharge modes influencing zinc–air battery’s cyclelife have been discussed as well. The corresponding solutions are also provided for extending cyclelife of the battery, such as horizontal configuration, flowing electrolyte, pulsating currents, corrosion inhibitors, triple electrodes and so on. These causes and measures will help improve the cyclelife and performance of zinc–air batteries, and thus offer an alternative to energy storage and transportation.

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304 Citations

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