2020
DOI: 10.1021/acsaem.9b02237
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Review and Recent Advances in Mass Transfer in Positive Electrodes of Aprotic Li–O2 Batteries

Abstract: The widely used Li-ion batteries are insufficient for the rapid needs of high energy storage devices. Li−O 2 batteries are regarded as a promising candidate to meet the needs in the future. This technology has attracted tremendous attention and led to remarkable scientific advances. We consider aprotic Li−O 2 batteries in this review because they have drawn the most attention of scientific research. However, various challenges should be resolved, such as low rate capability, poor cyclability, and instability, … Show more

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Cited by 38 publications
(29 citation statements)
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“…A challenge of high‐capacity MOB is the formation of insoluble reaction products, for example, KO 2 and Li 2 O 2 , within the porous cathode structure. Q is inherently limited by the available pore volume, hence the pore volume should be utilized as efficiently as possible [31] . However, relatively low degrees of pore volume utilization are typically achieved in MOB [32] .…”
Section: Introductionmentioning
confidence: 99%
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“…A challenge of high‐capacity MOB is the formation of insoluble reaction products, for example, KO 2 and Li 2 O 2 , within the porous cathode structure. Q is inherently limited by the available pore volume, hence the pore volume should be utilized as efficiently as possible [31] . However, relatively low degrees of pore volume utilization are typically achieved in MOB [32] .…”
Section: Introductionmentioning
confidence: 99%
“…As deposition proceeds in the boundaries, mass transport to the inner regions is hindered. It was found that discharge performance of LOB can be significantly improved by enabling transport of gaseous O 2 to the inner cathode regions, [30] since the diffusion coefficient of gaseous O 2 in air ( D (O2)air ≈10 −2 cm 2 /s) [31] is considerably higher than in electrolyte solvents, for example, dimethyl sulfoxide (DMSO) with D (O2)DMSO ≈10 −6 cm 2 /s [35] . A promising approach to optimize mass transfer is to change the wetting properties of the gas diffusion layer (GDL) [25,30–31] .…”
Section: Introductionmentioning
confidence: 99%
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“…Li-O 2 batteries have a long way to go, however, and each constituent of Li-O 2 battery packs, including Li metal anode, electrolyte, cathode (i.e., solid catalyst), and additives (i.e., redox mediators), needs attention and more in-depth study, which has been reviewed recently. [119][120][121][122] For catalysts, ORR and OER should be revisited in Li-O 2 batteries rather than simply transferring knowledge gained from water splitting. 123 The lack of a fundamental understanding of the reaction mechanism and the evolution of catalysis, however, are hampering the development of highly active oxide catalysts.…”
Section: Discussionmentioning
confidence: 99%
“…Then the electrons lost from the metal lithium, which are transferred from the external circuit to the porous electrode. At the same time, oxygen receives the electrons that are come from the external circuit, then the oxygen reduction occurs at the reaction sites of the porous electrode [55–60] . The diffusion and transport of oxygen in the porous electrode has an important effect on the performance of the battery.…”
Section: Effect Of Porous Electrode On Oxygen Diffusion and Battery Performancementioning
confidence: 99%