Enhanced Li‐O<sub>2</sub> Battery Performance in a Binary “Liquid Teflon” and Dual Redox Mediators

Balaish, Moran; Gao, Xiangwen; Bruce, Peter G.; Ein‐Eli, Yair

doi:10.1002/admt.201800645

Cited by 19 publications

(18 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4] However, the large overpotential of the batteries caused by the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is still a critical challenge to be surmounted (Figure 1a). [5][6] To well resolve the aforementioned obstacles, a variety of strategies have been introduced, including the construction of electrocatalyst materials and soluble redox mediators. [7][8][9] Although the charging voltage has been significantly reduced, electrocatalyst materials would expedite the parasitic decomposition of electrolytes battery is greatly accelerated.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Optical Field Multi‐Assisted Li–O₂ Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Wang

Guan

et al. 2021

Advanced Materials

View full text Add to dashboard Cite

during charging. [10][11] Furthermore, soluble redox mediators migrate to the anode for reduction by electron shuttle, leading to low efficiency and instability of Li metal anode. [12,13] Therefore, it is necessary to explore new ways to intrinsically promote the formation and decomposition of Li 2 O 2 and reduce the large overpotentials of Li-O 2 batteries.Recently, incorporating green and renewable solar energy to improve the reaction kinetics of ORR and OER in Li-O 2 batteries is recognized as one of the promising options. [14][15][16] Wu et al. first reported a photoassisted Li-O 2 battery with the dye-sensitized TiO 2 photoelectrode, which efficiently utilized the photovoltage to compensate for the battery's charging voltage. [17] Zhou et al. further employed a graphic carbon nitride as a cathode, achieving an ultralow charge potential (1.96 V). [18] With the introduction of illumination, the photogenerated electrons and holes on the cathode effectively enhance the kinetics of the OER process, leading to a reduced Li 2 O 2 oxidization overpotential. However, the rapid recombination rate of the photoelectrons and holes generated in semiconductors is still a key obstacle in photocatalyst-involving Li-O 2 batteries (Figure 1b). Conventionally, various state-of-art semiconductor heterojunctions, such as Schottky junctions, p-n junctions, and z-scheme heterostructures have been constructed to suppress the recombination of charge carriers. [19][20][21][22] Yet, the synthetic methods for heterostructures are complicated and rigorous. Accordingly, the noncontact and environmentally friendly external-magneticfield-tuned approach can be used as an efficient strategy. [23] It has been reported that the application of the magnetic field in the solar cell shows a significantly improved carrier separation and photoelectron conversion efficiency, which is ascribed to a deviation of the charge movement with a vertical force to the direction of movement in the magnetic field plane. [24] Hence, it is feasible and significant to apply an external magnetic field into a photoassisted Li-O 2 battery to enhance the ORR and OER kinetics of the battery.Based on the above understanding, we first report a novel prototype of a magnetic and optical field multi-assisted Li-O 2 battery with a 3D porous NiO nanosheets on the Ni foam (NiO/FNi) photoelectrode. Benefited from the abundant electron-hole pairs generated in the photoelectrode under the optical field, the difficult formation/decomposition of Li 2 O 2 during the discharge/charge process in a conventional Li-O 2The photoassisted lithium-oxygen (Li-O 2 ) system has emerged as an important direction for future development by effectively reducing the large overpotential in Li-O 2 batteries. However, the advancement is greatly hindered by the rapidly recombined photoexcited electrons and holes upon the discharging and charging processes. Herein, a breakthrough is made in overcoming these challenges by developing a new magnetic and optical field multi-assisted Li-O 2 battery with 3D por...

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic and Optical Field Multi‐Assisted Li–O₂ Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Wang

Guan

et al. 2021

Advanced Materials

View full text Add to dashboard Cite

show abstract

“…Although the dual RMs-assisted battery performance is no longer discounted by the sluggish ORR and ORR kinetics, the limited practical capacity and rate performance are still subjected to the narrow O 2 mass transport. To conquer this obstacle, a dual RM battery with a ‘liquid Teflon’-type binary perfluorocarbon was deliberately designed, which demonstrated an enhanced discharge capacity of 6 mAh cm –2 at a current density of 50 μA cm −2 [ 48 ]. Furthermore, based on the ‘redox targeting’ concept, a novel rechargeable redox flow Li–O 2 battery was developed (Fig.…”

Section: Application Of Rms To Li–o 2 Batteriesmentioning

confidence: 99%

Redox mediators for high-performance lithium–oxygen batteries

Dou

Xie

Wei

et al. 2022

National Science Review

View full text Add to dashboard Cite

The aprotic lithium-oxygen (Li-O2) batteries are receiving intense research interest in virtue of their ultra-high theoretical specific energy. However, current Li-O2 batteries are sufferring from severe barriers, such as sluggish reaction kinetics and undesired parasitic reactions. Recently, molecular catlysts, i.e., redox mediators (RMs), have been explored to catalyze the oxygen electrochemistry in Li-O2 batteries and are regarded as an advanced solution. To fully unlock the capability of Li-O2 batteries, an in-depth understanding of the catalytic mechanisms of RMs is necessary. In this review, we summarize the working principles of RMs and their selection criteria, highlight the recent significant progress of RMs, and discuss the critical scientific and technical challenges on the design of efficient RMs for next-generation Li-O2 batteries.

show abstract

“…RMs that can facilitate the discharge reaction (discharging RMs) by assisting the formation of Li 2 O 2 , by interacting either with Li ions or with oxygen, are important to combat these issues. Systems in which both discharging and charging RMs are added are known as dual RM systems. − …”

Section: Introductionmentioning

confidence: 99%

“…Discharging RMs reported to date include 2,5-di- tert -butyl-1,4-benzoquinone, ,, other quinone derivatives, − iron phthalocyanine, and ethyl viologens. ,, Among the reported charging RMs, there are nitroxide radicals, ,, tetrathiafulvalene, N -methylphenothiazine, tris [4-(diethylamino)-phenyl]amine, N,N,N′,N′ -tetramethyl- p -phenylenediamine, 5,10-dimethylphenazine, ferrocene, cobalt(II) bis (terpyridine), metal porphyrins, metal phthalocyanines, , LiI, CsI, InI 3 , LiBr, and LiNO 3 . 2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO) is a phenyl-substituted nitronyl nitroxide (Figure ) that combines charging and discharging redox-mediation functions in one molecule; there are two redox processes occurring at 2.1 and 3.7 V vs Li/Li + .…”

Section: Introductionmentioning

confidence: 99%

Nitronyl Nitroxide-Based Redox Mediators for Li-O₂ Batteries

et al. 2021

View full text Add to dashboard Cite

Electrochemical processes in Li-O 2 batteries benefit from the action of soluble electrocatalysts (redox mediators, RMs) that can facilitate charge or discharge reactions and minimize the blockage of the cathode with the insoluble discharge product Li 2 O 2 . In this work, 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO) analogues (RPTIOs) as new redox mediators for Li-O 2 batteries have been investigated. Cyclic voltammetry, scanning electron microscopy, X-ray diffraction studies, and the galvanostatic cycling of the Li-O 2 batteries showed that the RPTIOs could effectively catalyze the charge process while having a low impact on the discharge reaction. A direct connection was observed between the character of the substituent on the 2position of the imidazoline ring, the oxidation redox potential of the RPTIO, and the value of the charge voltage of the battery with this RM, paving a path for further optimization.

show abstract

Enhanced Li‐O₂ Battery Performance in a Binary “Liquid Teflon” and Dual Redox Mediators

Cited by 19 publications

References 42 publications

Magnetic and Optical Field Multi‐Assisted Li–O₂ Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Magnetic and Optical Field Multi‐Assisted Li–O₂ Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Redox mediators for high-performance lithium–oxygen batteries

Nitronyl Nitroxide-Based Redox Mediators for Li-O₂ Batteries

Contact Info

Product

Resources

About

Enhanced Li‐O2 Battery Performance in a Binary “Liquid Teflon” and Dual Redox Mediators

Cited by 19 publications

References 42 publications

Magnetic and Optical Field Multi‐Assisted Li–O2 Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Magnetic and Optical Field Multi‐Assisted Li–O2 Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Redox mediators for high-performance lithium–oxygen batteries

Nitronyl Nitroxide-Based Redox Mediators for Li-O2 Batteries

Contact Info

Product

Resources

About

Enhanced Li‐O₂ Battery Performance in a Binary “Liquid Teflon” and Dual Redox Mediators

Magnetic and Optical Field Multi‐Assisted Li–O₂ Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Magnetic and Optical Field Multi‐Assisted Li–O₂ Batteries with Ultrahigh Energy Efficiency and Cycle Stability

Nitronyl Nitroxide-Based Redox Mediators for Li-O₂ Batteries