A Long‐Life Lithium–Air Battery in Ambient Air with a Polymer Electrolyte Containing a Redox Mediator

Guo, Ziyang; Li, Chao; Liu, Jingyuan; Wang, Yonggang; Xia, Yongyao

doi:10.1002/ange.201701290

Cited by 56 publications

(28 citation statements)

References 41 publications

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“…As shown in figure 1 a , the peaks between 1610 and 1640 cm −1 in the spectrum of monomer A2 are related to the C=C groups, and no peak can be detected in the same spectrum region of PA2 and PA2 with 30 wt% PEO (PA2-30%PEO). Combined with the literature [ 22 , 23 ], these can be understood as the polymerization of acrylate groups via UV-curing. The peaks at approximately 1050 cm −1 can be attributed to the C-O group of PEO.…”

Section: Resultsmentioning

confidence: 99%

A polycarboxylic/ether composite polymer electrolyte via in situ UV-curing for all-solid-state lithium battery

et al. 2020

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A polycarboxylic/ether composite polymer electrolyte derived from two-arm monomer and polyethylene oxide (PEO) was in situ synthesized on the cathode. The composite electrolyte exhibits a high ionic conductivity of 3.6 × 10 −5 S cm –1 , high oxidation stability, excellent stability towards Li metal and makes Li/LiFePO 4 present good cyclic and rate performance at 25°C.

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Section: Resultsmentioning

confidence: 99%

A polycarboxylic/ether composite polymer electrolyte via in situ UV-curing for all-solid-state lithium battery

et al. 2020

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“…[117] A long-life Li-air battery in ambient air was developed with GPE containing a redox mediator. [118] The GPE efficiently alleviated the Li passivation induced by attacking air, and the reversible conversion of I − /I 2 in GPE acted as a redox mediator that facilitated the decomposition of discharge products. As a result, the Li-air battery equipped with LiI-contained GPE exhibited higher Coulombic efficiency nearly 100% and lower charge potential than those with GPEs free of LiI and in liquid electrolyte (Figure 3a).…”

Section: Redox-active Gpes For Li-o 2 Batterymentioning

confidence: 99%

“…By adding redox reactive P‐benzoquinone into the poly(vinylidene fluoride) (PVDF)‐based GPE for the Li–O 2 battery, it resulted in the charge potential decreasing from around 4.2 to 3.3 V with an improved cycling capability from 2 to over 30 cycles . A long‐life Li–air battery in ambient air was developed with GPE containing a redox mediator . The GPE efficiently alleviated the Li passivation induced by attacking air, and the reversible conversion of I − /I 2 in GPE acted as a redox mediator that facilitated the decomposition of discharge products.…”

Section: The Performance Improvement Of the Gpesmentioning

confidence: 99%

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Gel Polymer Electrolytes for Electrochemical Energy Storage

Cheng

Pan

Zhao

et al. 2017

Advanced Energy Materials

786

562

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storage devices with adjustable shapes and high flexibility, which is promising for the burgeoning portable and wearable electronics. [7][8][9] Furthermore, the flexibility and elasticity of GPEs are also prone to tolerate the volume change of electrode materials and the dendrites of lithium metal during charge and discharge processes. [10][11][12][13] As a consequence, GPEs have become one of the most desirable alternatives among various electrolytes for the electrochemical energy storage devices, and significant progress has been made in lithium-ion batteries (LIBs), supercapacitors (SCs), lithium-oxygen (Li-O 2 ) batteries as well as the other kinds of electrochemical energy storage devices, such as sodium-ion batteries, lithium-sulfur batteries, fuel cells, and zinc-air batteries. [14][15][16] In order to meet the requirements of wearable devices for flexibility and deformability, more special GPEs with tough, [17] stretchable, [18] and compressible [19] functionalities have been also developed.Typically, a polymeric framework is adopted in GPEs as host material, providing high mechanical integrity. Several criteria for a good polymer host lie in: [20][21][22] (i) fast segmental motion of polymer chain; (ii) special groups promoting the dissolution of salts; (iii) low glass transition temperature (T g ); (iv) high molecular weight; (v) wide electrochemical window; (vi) high degradation temperature. Within the framework, the salts in the GPEs serve as the sources of the charge carriers, which are generally required to have large anions and low dissociation energy for easier dissociating-induced free/mobile ions. According to the types of electrolytes, there are four categories of GPEs based on proton, [23] alkaline, [24] conducting salts, and ionic liquids (ILs). [25] The criteria for an appropriate electrolyte include: [26][27][28] (i) good dissociation without forming ion pairs or ion aggregation; (ii) high thermal, chemical, and electrochemical stability; (iii) high ionic conductivity. In order to dissolve both the polymer hosts and electrolytic salts, the organic/ aqueous solvents are introduced to provide the medium for ionic conduction. A good solvent should simultaneously have high dielectric constant (ɛ > 15), donor number for more dissociation of ion and chemical and electrochemical stability. Organic solvents normally include ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dimethyl formamide (DMF), dimethyl sulphoxide, ethyl methyl carbonate, and tetrahydrofuran.To prepare a high-performance GPE, it is essential to select the species of host polymer, solvent, and electrolytic salt, and then blend them by solution or melt processes, such as casting With the booming development of flexible and wearable electronics, their safety issues and operation stabilities have attracted worldwide attentions. Compared with traditional liquid electrolytes, gel polymer electrolytes (GPEs) are preferred due to their higher safety and adaptability to the design of ...

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“…The increased charging overpotential has been considered to be a shuttle effect related to the diffusion of soluble RMs during the charging process 19 . Oxidized RMs could diffuse through the separator and be reduced at the Li metal anode, leading to the deactivation of the RMs and the decline of electrical energy efficiency during charging process 20 .…”

Section: Introductionmentioning

confidence: 99%

Anode interfacial layer formation via reductive ethyl detaching of organic iodide in lithium–oxygen batteries

Zhang

Sun

et al. 2019

Nat Commun

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As soluble catalysts, redox mediators can reduce the high charging overpotential of lithium-oxygen batteries by providing sufficient liquid-solid interface for lithium peroxide decomposition. However, the redox mediators usually introduce undesirable reactions. In particular, the so-called “shuttle effect” leads to the loss of both the redox mediators and electrical energy efficiency. In this study, an organic compound, triethylsulfonium iodide, is found to act bifunctionally as both a redox mediator and a solid electrolyte interphase-forming agent for lithium-oxygen batteries. During charging, the organic iodide exhibits comparable lithium peroxide-oxidizing capability with inorganic iodides. Meanwhile, it in situ generates an interfacial layer on lithium anode via reductive ethyl detaching and the subsequent oxidation. This layer prevents the lithium anode from reacting with the redox mediators and allows efficient lithium-ion transfer leading to dendrite-free lithium anode. Significantly improved cycling performance has been achieved by the bifunctional organic iodide redox mediator.

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A Long‐Life Lithium–Air Battery in Ambient Air with a Polymer Electrolyte Containing a Redox Mediator

Cited by 56 publications

References 41 publications

A polycarboxylic/ether composite polymer electrolyte via in situ UV-curing for all-solid-state lithium battery

A polycarboxylic/ether composite polymer electrolyte via in situ UV-curing for all-solid-state lithium battery

Gel Polymer Electrolytes for Electrochemical Energy Storage

Anode interfacial layer formation via reductive ethyl detaching of organic iodide in lithium–oxygen batteries

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