High‐Capacity and Stable Li‐O<sub>2</sub> Batteries Enabled by a Trifunctional Soluble Redox Mediator

Xiong, Qi; Huang, Gang; Zhang, Xinbo

doi:10.1002/anie.202009064

Cited by 68 publications

(43 citation statements)

References 68 publications

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“…1b), indicating there is a strong interaction between TMP and Li + , or in other words, Li + can be solvated by TMP. 19,23,33 The inuence of the addition of TMP on the electrochemical performance was determined by cyclic voltammetry (CV) measurements in a three-electrode electrochemical cell. No additional peaks appears under the condition of argon or oxygen atmosphere (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, when 50 mM TMP is introduced, the disk current keeps increasing with the increase of the rotation speed, revealing that the solution phase pathway is dominant. 19,[34][35][36]…”

Section: Resultsmentioning

confidence: 99%

“…13,14 Since the Bruce group rst reported TTF (tetrathiafulvalene) as RM in 2013, 15 a variety of RMs have been developed. For example, DBBQ (2,5-di-tert-butyl-1,4-benzoquinone), 16 TEMPO (2,2,6,6-tetramethylpiperidinyloxy), 17,18 DBDMB (2,5-di-tert-butyl-1,4-dimethoxybenzene) 19 and halides. 20,21 These RMs participate in the reaction of LOB with their own redox pairs to promote the progress of the reaction.…”

Section: Introductionmentioning

confidence: 99%

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Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

et al. 2021

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Section: Resultsmentioning

confidence: 99%

“…However, when 50 mM TMP is introduced, the disk current keeps increasing with the increase of the rotation speed, revealing that the solution phase pathway is dominant. 19,[34][35][36]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

et al. 2021

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“…This reduced the undesired parasitic reactions toward the solvent, increased the Li 2 O 2 yield up to 96.6%, and removed the Li 2 CO 3 and LiOH byproducts. [ 162 ]…”

Section: Npm Of Reduction Electrodesmentioning

confidence: 99%

Nano Polymorphism‐Enabled Redox Electrodes for Rechargeable Batteries

Mei

Wang

et al. 2020

Advanced Materials

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dimensions of materials are decreased to the nanoscale, the high surface aspect ratio generates additional engineerable space, which enables the polymorphism of nanomaterials. Recently, nano polymorphism (NPM) has been emerging as a topic of interest in the energy storage field, and research is expected to identify and rationally exploit the "processingstructure-properties" relationships of functional materials of interest in the context of the emerging rechargeable battery applications, particularly for cathode and anode materials. To date, the research on the NPM of rechargeable battery electrodes has achieved significant progress. [1-3] Many electrode materials with various polymorphs, such as traditional layered metal oxides and some emerging types of graphene-like nanosized materials, have been intensively investigated for improving the electrochemical performance of batteries. Moreover, the in-depth underlying storage mechanisms of different polymorphs have been fully or partly revealed using advanced in situ characterization techniques. Based on the previously reported theoretical and experimental results, some potential structural Nano polymorphism (NPM), as an emerging research area in the field of energy storage, and rechargeable batteries, have attracted much attention recently. In this review, the recent progress on the composition and formation of polymorphs, and the evolution processes of different redox electrodes in rechargeable metal-ion, metal-air, and metal-sulfur batteries are highlighted. First, NPM and its significance for rechargeable batteries are discussed. Subsequently, the current NPM modulation strategies of different types of representative electrodes for their corresponding rechargeable battery applications are summarized. The goal is to demonstrate how NPM could tune the intrinsic material properties, and hence, improve their electrochemical activities for each battery type. It is expected that the analysis of polymorphism and electrochemical properties of materials could help identify some "processing-structure-properties" relationships for material design and performance enhancement. Lastly, the current research challenges and potential research directions are discussed to offer guidance and perspectives for future research on NPM engineering.

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“…[5] As cathode corrosion aggravates, the batteries deliver poor cycle stability.Over the past few decades, numerous studies have intensively focused on cathodes and catalysts to address the main challenges in the Li-O 2 batteries. [6][7][8][9][10][11][12] Single atom materials with superior catalytic properties and unique electronic structure are promising electrode materials for Li-O 2 batteries. [13][14][15][16][17][18][19] Single atoms serving as catalytic centers effectively promote the slow kinetic process of lithium oxygen batteries.…”

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confidence: 99%

Synergistic Catalysis by Single‐Atom Catalysts and Redox Mediator to Improve Lithium–Oxygen Batteries Performance

Zhu

et al. 2021

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to low round-trip efficiency as well as limited capacity. And cathode clogging arising from insulated, insoluble discharge products accumulation blocks the electron transfer and oxygen/Li + diffusion, resulting in a high overpotential for the electrochemical reactions, which will trigger parasitic reactions such as electrolyte oxidation. [5] As cathode corrosion aggravates, the batteries deliver poor cycle stability.Over the past few decades, numerous studies have intensively focused on cathodes and catalysts to address the main challenges in the Li-O 2 batteries. [6][7][8][9][10][11][12] Single atom materials with superior catalytic properties and unique electronic structure are promising electrode materials for Li-O 2 batteries. [13][14][15][16][17][18][19] Single atoms serving as catalytic centers effectively promote the slow kinetic process of lithium oxygen batteries. [20] However, the catalysis of immobile single-atom catalysts is limited only for Li 2 O 2 particles directly deposited on the surface of the catalysts without oxidizing the electronically isolating Li-peroxide layers, which leads to low round-trip efficiency and poor cycle stability. [21][22][23] To address this concern, many attempts have been made to effectively promote the decomposition of Li 2 O 2 . Recently, redox mediators, a kind of liquid catalysts have been developed for facilitating the oxidation of Li 2 O 2 upon charging. [24,25] The redox mediators will first be oxidized in solution phase to form oxidized species during charge process, followed by chemically oxidizing the Li 2 O 2 from the solution side so that the catalytic effect can be exerted on all the Li 2 O 2 that is formed during the ORR process. [26] Lithium bromide (LiBr) was first proposed by Sun and coworkers as a RM in Li-O 2 batteries to reduce the OER overvoltage. [27] Br − can be oxidized upon charging at 3.48 V to Br 3 − and further be oxidized to Br 2 at 4.0 V, both of which can readily react with Li 2 O 2 to form Br − , Li + , and O 2 . [28,29] However, undesirable shuttle phenomenon, that is Br 2 or Br 3 − diffuse to and react with Li anode, resulting in the poor cycle stability and round-trip efficiency. [26] Herein, we report the successful combination of single-atom cobalt anchored in porous N-doped hollow carbon spheres Lithium-oxygen (Li-O 2 ) batteries with ultrahigh theoretical energy density have attracted widespread attention while there are still problems with high overpotential and poor cycle stability. Rational design and application of efficient catalysts to improve the performance of Li-O 2 batteries is of significant importance. In this work, Co single atoms catalysts are successfully combined with redox mediator (lithium bromide [LiBr]) to synergistically catalyze electrochemical reactions in Li-O 2 batteries. Single-atom cobalt anchored in porous N-doped hollow carbon spheres (CoSAs-NHCS) with high specific surface area and high catalytic activity are utilized as cathode material. However, the potential performances of batteries are difficult to...

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High‐Capacity and Stable Li‐O₂ Batteries Enabled by a Trifunctional Soluble Redox Mediator

Cited by 68 publications

References 68 publications

Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

Nano Polymorphism‐Enabled Redox Electrodes for Rechargeable Batteries

Synergistic Catalysis by Single‐Atom Catalysts and Redox Mediator to Improve Lithium–Oxygen Batteries Performance

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High‐Capacity and Stable Li‐O2 Batteries Enabled by a Trifunctional Soluble Redox Mediator

Cited by 68 publications

References 68 publications

Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

Nano Polymorphism‐Enabled Redox Electrodes for Rechargeable Batteries

Synergistic Catalysis by Single‐Atom Catalysts and Redox Mediator to Improve Lithium–Oxygen Batteries Performance

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High‐Capacity and Stable Li‐O₂ Batteries Enabled by a Trifunctional Soluble Redox Mediator