Mechanistic insights for the development of Li–O2battery materials: addressing Li2O2conductivity limitations and electrolyte and cathode instabilities

McCloskey, Bryan D.; Burke, Colin M.; Nichols, James Hastings; Renfrew, Sara E.

doi:10.1039/c5cc04620c

Cited by 116 publications

(132 citation statements)

References 134 publications

(284 reference statements)

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“…The overall results of the project concord well with other recent reports to conclude that this technology, despite its important promises, is still far from commercialization [14,[28][29]. A number of critical issues and challenges need to find solutions before an application can be envisioned.…”

Section: A) B)supporting

confidence: 67%

Assessment of the Li-air Battery Technology for Automotive Applications through the Development of a Multi-Electrode Solid-State Prototype

Laforgue

Toupin

Mokrini

et al. 2016

WEVJ

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SummaryThis report highlights the results of a project carried out at the National Research Council of Canada (NRC), with the overall objective to address the major issues of the Li-air battery technology and assemble a multi-electrode pilot-scale prototype. Several innovative ideas and technologies were investigated along the core concept of a polymer-based solid-state technology. The assessment of the Li-air technology is discussed through the results of the project as well as other sources, especially concerning its readiness and perspectives for automotive applications.

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Section: A) B)supporting

confidence: 67%

Assessment of the Li-air Battery Technology for Automotive Applications through the Development of a Multi-Electrode Solid-State Prototype

Laforgue

Toupin

Mokrini

et al. 2016

WEVJ

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“…[34] Nevertheless,t he enhanced solubility of LiO 2 may increase the presence of superoxide species,which negatively impacts the stability of the electrolyte and the cathode following mechanisms as discussed in Section 2. [73][74][75] This effect has not been experimentally studied in the literature.…”

Section: The Cathode Reaction Pathways Influenced By the Electrolytementioning

confidence: 99%

Why Do Lithium–Oxygen Batteries Fail: Parasitic Chemical Reactions and Their Synergistic Effect

et al. 2016

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“…2,3,12,13,15 However, the Li 2 O 2 on the separator observed here offers an alternative viewpoint on a suitable direction for optimization of the Li-O 2 battery. Previous studies have shown that the morphology of the discharge product observed on the cathode surface changes…”

Section: •¹mentioning

confidence: 99%

Effect of Anion in Glyme-based Electrolyte for Li-O₂ Batteries: Stability/Solubility of Discharge Intermediate

et al. 2017

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This study demonstrates that the amount of discharge product (Li 2 O 2 ) precipitated on the separator in a lithium oxygen cell using glyme-based electrolytes depends on the anion. The stability of the discharge intermediate (LiO 2 ) in the electrolyte has been shown to depend on the anionic species, which is related to Li 2 O 2 precipitation on the separator. The implications for producing an efficient and long-life Li-O 2 cell are elaborated. Keywords: Li-O 2 battery | Lithium superoxide | AnionThe Li-O 2 battery has been attracting a great deal of attention due to its high theoretical energy density.1 The solubility of the) is a critical parameter, because its solubility is believed to directly affect the morphology of the final discharge product, Li 2 O 2 .2 This morphology determines the rate of cathode clogging, thus also the maximum discharge capacity.2,3 The morphology has also been shown to affect the charging potential, 4 and thus directly influences the energy efficiency. However, a little-considered aspect is the extent to which the solubility of the O 2•¹ may allow the transport of reduced O 2 species away from the electrode. Nazar et al. reported SEM observation of discharge product deposition on glass fiber (separator) for a cell using 1 M lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA])/tetraethylene glycol dimethyl ether (G4) electrolyte. 5 The implications, in terms of cell cyclability, of precipitation of discharge product on an electronically nonconductive component of the cell are self-evident. Moreover, Liu et al. have demonstrated the presence of large amounts of predominantly amorphous precipitates in the separator of a Li-O 2 battery using a 1 M lithium trifluoromethanesulfonate (Li[OTf])/ G4 electrolyte, and commented on their detrimental effects on cell overpotential and cyclability. 6 In their later work, they also reported X-ray diffraction-based evidence for crystalline Li 2 O 2 in the separator.7 A means to tune the degree of discharge product loss to the separator (and elsewhere in the cell) by variation of the electrolyte properties is thus desirable. The effect of variation of electrolyte, and in particular the anion, on this phenomenon has not yet been reported, to the best of our knowledge.In this study, we present an analysis of the variation of O 2•¹ solubility, and its subsequent effect on Li 2 O 2 distribution in the cell, for a series of glyme-based electrolyte solutions. In our previous study, 8 we applied a 1:1 mixture of Li salt and glyme for oxygen reduction/evolution. We have also recently shown that variation of the anion in such 1:1 solutions results in large differences in the amount of free glyme depending on the choice of Li salt. 9 Thus, to fully characterize the direct effect of the anion on the intermediate solubility and stability, we have chosen to explore more dilute solutions in this study, in which the effects may be more easily observed. The molar ratio of lithium salt to triethylene glycol dimethyl ether (G3) was kept constant (1:4), and the vario...

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Mechanistic insights for the development of Li–O₂battery materials: addressing Li₂O₂conductivity limitations and electrolyte and cathode instabilities

Cited by 116 publications

References 134 publications

Assessment of the Li-air Battery Technology for Automotive Applications through the Development of a Multi-Electrode Solid-State Prototype

Assessment of the Li-air Battery Technology for Automotive Applications through the Development of a Multi-Electrode Solid-State Prototype

Why Do Lithium–Oxygen Batteries Fail: Parasitic Chemical Reactions and Their Synergistic Effect

Effect of Anion in Glyme-based Electrolyte for Li-O₂ Batteries: Stability/Solubility of Discharge Intermediate

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Mechanistic insights for the development of Li–O2battery materials: addressing Li2O2conductivity limitations and electrolyte and cathode instabilities

Cited by 116 publications

References 134 publications

Assessment of the Li-air Battery Technology for Automotive Applications through the Development of a Multi-Electrode Solid-State Prototype

Assessment of the Li-air Battery Technology for Automotive Applications through the Development of a Multi-Electrode Solid-State Prototype

Why Do Lithium–Oxygen Batteries Fail: Parasitic Chemical Reactions and Their Synergistic Effect

Effect of Anion in Glyme-based Electrolyte for Li-O2 Batteries: Stability/Solubility of Discharge Intermediate

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Mechanistic insights for the development of Li–O₂battery materials: addressing Li₂O₂conductivity limitations and electrolyte and cathode instabilities

Effect of Anion in Glyme-based Electrolyte for Li-O₂ Batteries: Stability/Solubility of Discharge Intermediate