High rate oxygen reduction in non-aqueous electrolytes with the addition of perfluorinated additives

Wang, Yufei; Zheng, Dong; Yang, Xiao‐Qing; Qu, Deyang

doi:10.1039/c1ee01556g

Cited by 81 publications

(80 citation statements)

References 17 publications

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“…It can be seen that, at the current density of 500 mA g À 1 , the Li-O 2 cell with the P-HSC deposited onto CP cathode exhibits a higher discharge capacity of 12,254 mAh g À 1 than those with the HSC deposited onto CP (9,280 mAh g À 1 ) and the SP (5,250 mAh g À 1 ). Unexpectedly, even at the very high current density of 1,500 mA g À 1 , the discharge capacity of the P-HSC deposited onto CP can still reach 5,900 mAh g À 1 , which is more than 37 times than that with the conventional SP cathode (160 mAh g À 1 ), which is among the best rate performances of non-aqueous Li-O 2 batteries 3,16,24,27,33 . It should be noted that the discharge/charge capacity of the Li-O 2 cells using only a pristine CP cathode is very low ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 80%

Tailoring deposition and morphology of discharge products towards high-rate and long-life lithium-oxygen batteries

et al. 2013

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Lithium-oxygen batteries are an attractive technology for electrical energy storage because of their exceptionally high-energy density; however, battery applications still suffer from low rate capability, poor cycle stability and a shortage of stable electrolytes. Here we report design and synthesis of a free-standing honeycomb-like palladium-modified hollow spherical carbon deposited onto carbon paper, as a cathode for a lithium-oxygen battery. The battery is capable of operation with high-rate (5,900 mAh g À 1 at a current density of 1.5 A g À 1 ) and long-term (100 cycles at a current density of 300 mA g À 1 and a specific capacity limit of 1,000 mAh g À 1 ). These properties are explained by the tailored deposition and morphology of the discharge products as well as the alleviated electrolyte decomposition compared with the conventional carbon cathodes. The encouraging performance also offers hope to design more advanced cathode architectures for lithium-oxygen batteries.

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Section: Resultsmentioning

confidence: 80%

Tailoring deposition and morphology of discharge products towards high-rate and long-life lithium-oxygen batteries

et al. 2013

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“…Although cell failure due to Li dendrite formation has been extensively studied for Li-ion battery application 15 , it is not clear if such a mechanism is applicable to the Li-O 2 batteries because of the differences in the cell construction, materials and operating environments. At present, the studies on the cyclability and stability of Li-O 2 batteries have been primarily focused on the cathode catalysts [16][17][18][19][20][21][22][23][24][25][26][27][28][29] , electrolytes [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] , binder 45 and so on. For example, the electrolyte decomposition was found during the cycling of Li-O 2 batteries, which led to the formation of by-products such as H 2 O, CO 2 , insoluble Li salts, and the eventual degradation of the cathode and the separator [33][34][35][36][46][47][48][49][50][51] .…”

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confidence: 99%

Reversibility of anodic lithium in rechargeable lithium–oxygen batteries

et al. 2013

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Non-aqueous lithium-air batteries represent the next-generation energy storage devices with very high theoretical capacity. The benefit of lithium-air batteries is based on the assumption that the anodic lithium is completely reversible during the discharge-charge process. Here we report our investigation on the reversibility of the anodic lithium inside of an operating lithium-air battery using spatially and temporally resolved synchrotron X-ray diffraction and three-dimensional micro-tomography technique. A combined electrochemical process is found, consisting of a partial recovery of lithium metal during the charging cycle and a constant accumulation of lithium hydroxide under both charging and discharging conditions. A lithium hydroxide layer forms on the anode separating the lithium metal from the separator. However, numerous microscopic 'tunnels' are also found within the hydroxide layer that provide a pathway to connect the metallic lithium with the electrolyte, enabling sustained iontransport and battery operation until the total consumption of lithium.

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“…Oxygen transport limitations are addressed in nature via the use of oxygen-binding proteins (e.g., hemoglobin) that improve O 2 solubility and also forced convection through the cardiovascular system [135]. These concepts can be applied to Li-O 2 cells: one study found that oxygen-binding perfluorinated additives improved discharge capacity [138]. No reports, to the best of our knowledge, have employed forced convection in Li-O 2 cells; however, continuum-scale models have predicted that the use of forced convection could significantly improve Li-O 2 discharge capacity [139].…”

Section: Other Conceptsmentioning

confidence: 99%

Non-aqueous Metal–Oxygen Batteries: Past, Present, and Future

Radin

Siegel

2015

Rechargeable Batteries

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A metal-oxygen battery (sometimes referred to as a 'metal-air' battery) is a cell chemistry in which one of the reactants is gaseous oxygen, O 2 . Oxygen enters the cell typically in the positive electrode-perhaps after being separated from an inflow of air-and dissolves in the electrolyte. The negative electrode is typically a metal monolith or foil. Upon discharge, metal cations present in the electrolyte react with dissolved oxygen and electrons from the electrode to form a metal-oxide or metal-hydroxide discharge product. In some chemistries the discharge product remains dissolved in the electrolyte; in other systems it precipitates out of solution, forming a solid phase that grows in size as discharge proceeds. In secondary metal-oxygen batteries the recharge process proceeds via the decomposition of the discharge phase back to O 2 and dissolved metal cations. In light of the processes associated with discharge and charging, reversible metal-oxygen batteries with solid discharge products are often referred to as precipitation-dissolution systems, a category that also includes lithium-sulfur batteries.The interest in metal-oxygen chemistries follows from their very high theoretical energy densities. Figure 1 summarizes the gravimetric and volumetric energy densities for several metal-oxygen couples, and compares these to the theoretical energy density of a conventional lithium-ion battery. On the basis of these energy densities, it is clear that many metal-oxygen systems hold promise for surpassing the state-of-the-art Li-ion system. Achieving this goal, however, remains a significant challenge when factors beyond energy density are accounted for: cycle life, round-trip efficiency, and cost

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High rate oxygen reduction in non-aqueous electrolytes with the addition of perfluorinated additives

Cited by 81 publications

References 17 publications

Tailoring deposition and morphology of discharge products towards high-rate and long-life lithium-oxygen batteries

Tailoring deposition and morphology of discharge products towards high-rate and long-life lithium-oxygen batteries

Reversibility of anodic lithium in rechargeable lithium–oxygen batteries

Non-aqueous Metal–Oxygen Batteries: Past, Present, and Future

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