Correction: Recent advances in understanding of the mechanism and control of Li2O2 formation in aprotic Li–O2 batteries

Lyu, Zhiyang; Zhou, Yin; Dai, Wenrui; Cui, Xinhang; Lai, Min; Wang, Li; Huo, Fengwei; Huang, Wei-Ching; Zheng, Hu; Chen, Wei

doi:10.1039/c7cs90095c

Cited by 28 publications

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“…At low current density, the discharge voltage is constant and closer to the thermodynamical potential for Li 2 O 2 (2.96 V vs. Li + /Li) [41]. The formation of Li 2 O 2 as a discharge product [42,43] was confirmed by postmortem XRD patterns in which characteristic peaks for crystalline Li 2 O 2 could be observed for CFs, MWCNT and carbon Super P electrodes discharging at different rates ( Fig. 2a).…”

Section: Resultsmentioning

confidence: 65%

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Electrospun carbon fibers as air cathodes for aprotic Li–O2 battery: Towards cathode design for enhanced capacity

Osman

Yin

Petenzi

et al. 2020

Electrochimica Acta

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This report investigates how the microstructures and chemical properties of carbon cathodes influence on the discharge capacity of aprotic Li-O 2 batteries. For that, electrospun carbon fibers (CFs), Multi-wall carbon nanotubes (MWCNTs), carbon Super P and gas diffusion layer (GDL) were fully discharged at various applied current densities (0.05-0.5 mA.cm-2 (geom)) and characterized by means of ex-situ techniques such as XRD and FEGSEM. The major discharge product for every carbon electrode was identified as Li 2 O 2 by both XRD and gas pressure analysis. The corresponding electrochemical results showed two different behaviors depending on the current density. At high current densities, all the carbon electrodes presented quite similar discharge capacities due to the most favored formation of Li 2 O 2 conformal film on the carbon surface. In contrast, at lower current densities, the morphology of the discharge product changed and Li 2 O 2 was preferably deposited as micrometersized toroïds particles on all the carbon cathodes (except for GDL). In this particular regime, the specific capacity normalized by the active carbon surface area of the electrospun CFs cathode was surprisingly promoted compared to the other carbon materials. Interestingly, it was found that unlike for the other cathode materials, Li 2 O 2 homogenously occupies the void volume of the electrospun carbon structure without any pores clogging, which was attributed to its particular macroporous architecture presumably facilitating a continuous O 2 diffusion through the electrode. The enhancement in discharge capacity might also be related to the presence of nitrogen active sites, as revealed by XPS analysis of the pristine carbon surface. All these features highlight that the carbon porosity and surface chemistry are key parameters to design efficient air cathodes for Li-O 2 batteries performing at low current density.

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Section: Resultsmentioning

confidence: 65%

“…3b). Such a film formation, resulting from a surface mediated mechanism [42], indicates the electrical passivation of the GDL which is coherent with the rapid death of the cells exhibiting very low capacities and poor rate capability ( Fig. 1).…”

Section: Resultsmentioning

confidence: 66%

Electrospun carbon fibers as air cathodes for aprotic Li–O2 battery: Towards cathode design for enhanced capacity

Osman

Yin

Petenzi

et al. 2020

Electrochimica Acta

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“…As shown in Fig. 3A, no redox feature was observed in dry O 2 , because the rate-controlling step for the reduction of O 2 (O 2 + e − → O 2 − ) was hindered by the high kinetics barrier of the solid-state cathode ( 40 ). The small reduction and oxidation peaks around ~2.5 and ~3.7 V were observed in the CV of the cell in dry O 2 at a lower scan rate of 0.05 mV/s at 60°C, which implies that the oxygen redox in the solid-state cathode could hardly occur at the solid-gas interphase (fig.…”

Section: Resultsmentioning

confidence: 99%

Carbon-free high-performance cathode for solid-state Li-O ₂ battery

et al. 2022

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The development of a cathode for solid-state lithium-oxygen batteries has been hindered in practice by a low capacity and limited cycle life despite their potential for high energy density. Here, a previously unexplored strategy is proposed wherein the cathode delivers a specific capacity of 200 milliampere hour per gram over 665 discharge/charge cycles, while existing cathodes achieve only ~50 milliampere hour per gram and ~100 cycles. A highly conductive ruthenium-based composite is designed as a carbon-free cathode by first-principles calculations to avoid the degradation associated with carbonaceous materials, implying an improvement in stability during the electrochemical cycling. In addition, water vapor is added into the main oxygen gas as an additive to change the discharge product from growth-restricted lithium peroxide to easily grown lithium hydroxide, resulting in a notable increase in capacity. Thus, the proposed strategy is effective for developing reversible solid-state lithium-oxygen batteries with high energy density.

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“…Recently, researchers have made fruitful progress in this aspect including the ascertainment of O 2 /Li 2 O 2 reaction pathways by the identification of short life-span intermediates, observation of Li 2 O 2 growth in operando electromicroscopy, estimation of mass transport limitation, and exploration of cell components' degradation mechanism. [14][15][16][17] Despite the remarkable progress in mechanistic understanding, more details need to be uncovered, in particular, the nature of transient intermediates during the operation of the Li-O 2 batteries. Therefore, powerful operando analytical methods are critically needed.…”

Section: Introductionmentioning

confidence: 99%

Oxygen electrochemistry in Li‐O₂ batteries probed by in situ surface‐enhanced Raman spectroscopy

Wang

et al. 2021

SusMat

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Surface‐enhanced Raman spectroscopy (SERS), as a nondestructive and ultra‐sensitive single molecular level characterization technique, is a powerful tool to deeply understand the interfacial electrochemistry reaction mechanism involved in energy conversion and storage, especially for oxygen electrochemistry in Li‐O2 batteries with unrivaled theoretical energy density. SERS can provide precise spectroscopic identification of the reactants, intermediates and products at the electrode|electrolyte interfaces, independent of their physical states (solid and/or liquid) and crystallinity level. Furthermore, SERS's power to resolve different isotopes can be exploited to identify the mass transport limitation and reactive sites of the passivated interface. In this review, the application of in situ SERS in studying the oxygen electrochemistry, specifically in aprotic Li‐O2 batteries, is summarized. The ideas and concepts covered in this review are also extended to the perspectives of the spectroelectrochemistry in general aprotic metal‐gas batteries.

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Correction: Recent advances in understanding of the mechanism and control of Li₂O₂ formation in aprotic Li–O₂ batteries

Abstract: Correction for 'Recent advances in understanding of the mechanism and control of LiO formation in aprotic Li-O batteries' by Zhiyang Lyu et al., Chem. Soc. Rev., 2017, DOI: 10.1039/c7cs00255f.

Cited by 28 publications

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Electrospun carbon fibers as air cathodes for aprotic Li–O2 battery: Towards cathode design for enhanced capacity

Electrospun carbon fibers as air cathodes for aprotic Li–O2 battery: Towards cathode design for enhanced capacity

Carbon-free high-performance cathode for solid-state Li-O ₂ battery

Oxygen electrochemistry in Li‐O₂ batteries probed by in situ surface‐enhanced Raman spectroscopy

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Correction: Recent advances in understanding of the mechanism and control of Li2O2 formation in aprotic Li–O2 batteries

Abstract: Correction for 'Recent advances in understanding of the mechanism and control of LiO formation in aprotic Li-O batteries' by Zhiyang Lyu et al., Chem. Soc. Rev., 2017, DOI: 10.1039/c7cs00255f.

Cited by 28 publications

References 0 publications

Electrospun carbon fibers as air cathodes for aprotic Li–O2 battery: Towards cathode design for enhanced capacity

Electrospun carbon fibers as air cathodes for aprotic Li–O2 battery: Towards cathode design for enhanced capacity

Carbon-free high-performance cathode for solid-state Li-O 2 battery

Oxygen electrochemistry in Li‐O2 batteries probed by in situ surface‐enhanced Raman spectroscopy

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Product

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Correction: Recent advances in understanding of the mechanism and control of Li₂O₂ formation in aprotic Li–O₂ batteries

Carbon-free high-performance cathode for solid-state Li-O ₂ battery

Oxygen electrochemistry in Li‐O₂ batteries probed by in situ surface‐enhanced Raman spectroscopy