Nanosize stabilized Li-deficient Li2−xO2 through cathode architecture for high performance Li-O2 batteries

Fan, Wei; Wang, Beizhou; Guo, Xiangxin; Kong, Xiangyang; Li, Jianjun

doi:10.1016/j.nanoen.2016.08.007

Cited by 44 publications

(45 citation statements)

References 51 publications

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“…This difference implies that nonstoichiometric Li 2− x O 2 is more favorable than Li 2 O 2 to support rechargeable Li–O 2 batteries with superior performance, since the reduced resistivity of the discharge product contributes to fast charge transport and alleviates side reactions. Modification of the cathode, especially by the addition of catalysts, has been used to increase the number of Li vacancies . For example, Li vacancies were found on the surface of the discharge product on a NiCo 2 O 4 ‐modified cathode, as evidenced by annular bright‐field STEM figure, where both LiO 2 and O‐deficient LiO 2 (Li‐deficient Li 2 O 2 ) can be identified .…”

Section: Induced Defects In Li2o2mentioning

confidence: 99%

“…b) SAED of the discharge products on ZnO/VACNTs. c,d) Li K‐edge and O K‐edge EELS spectra for the ZnO/VACNTs and the pristine VACNTs after the first discharge to 2 V. Reproduced with permission . Copyright 2016, Elsevier Ltd.…”

Section: Induced Defects In Li2o2mentioning

confidence: 99%

“…An increased number of Li vacancies was also observed in metal oxide‐modified systems. Fan et al combined ZnO and vertically aligned carbon nanotubes (VACNTs) to promote the formation of Li 2 O 2 nanocrystals with a size of 5–6 nm . The SAED image of the discharge product in Figure b revealed that crystalline LiO 2 was formed in this system.…”

Section: Induced Defects In Li2o2mentioning

confidence: 99%

“…Although this method is not applicable for quantitative studies, it can still be used to roughly identify a relatively large number of Li defects. Because the SAED patterns for both Li 3 O 4 and Li 2 O 2 coincided, determining the presence of Li 3 O 4 mainly relied on calculation results . However, Li 3 O 4 was stable at high pressure, suggesting that there should be much less Li 3 O 4 than LiO 2 at a pressure of 1 atm.…”

Section: Induced Defects In Li2o2mentioning

confidence: 99%

“…The computed adsorption energy indicated that LiO 2 was more favorably adsorbed at the interface of ZnO/VACNT than Li 2 O 2 and Li 3 O 4 ; thus, further disproportionation was inhibited. Several reports have shown that the formation of Li 2− x O 2 can be induced by using semiconducting catalysts, but similarly, no mechanism with concrete evidence has been proposed . Thus, more research is required to develop a clearer understanding of the function and catalytic mechanism of semiconductors in Li–O 2 batteries.…”

Section: Induced Defects In Li2o2mentioning

confidence: 99%

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Defect Chemistry in Discharge Products of Li–O₂ Batteries

et al. 2018

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Li–O2 batteries, possessing the highest theoretical specific energy density among all known Li‐ion‐based batteries, demonstrate great potential as energy storage devices for powering electric vehicles. However, their battery performance is significantly limited by the insulating nature of the discharge product Li2O2, which has a wide bandgap (4–5 eV), resulting in high charge overpotential. Defect engineering of the discharge product emerges as a very promising strategy to improve the electrical conductivity and hence reduce the charge overpotential. The aim of this review is to highlight recent advances and progress in understanding and controlling the defect chemistry of discharge products in Li–O2 batteries. First, the theoretical perspectives of defects in Li2O2 are reviewed, with particular emphasis on defect design and engineering strategies to significantly improve the charge transport properties of Li2O2. Then intermediate defects in Li2O2 formed during the discharge and charge processes and materials with induced defects, including Li2− x O2, doped Li2O2, Li2O2 with surface/grain boundaries, and amorphous Li2O2, which are tailored by engineered catalysts and electrolyte additives are discussed. Finally, other alternative energy carriers for new energy storage chemistry of Li–O2 batteries, such as lithium superoxide, lithium hydroxide, and lithium carbonate, will also be discussed.

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Section: Induced Defects In Li2o2mentioning

confidence: 99%

Section: Induced Defects In Li2o2mentioning

confidence: 99%

Section: Induced Defects In Li2o2mentioning

confidence: 99%

Section: Induced Defects In Li2o2mentioning

confidence: 99%

Section: Induced Defects In Li2o2mentioning

confidence: 99%

See 3 more Smart Citations

Defect Chemistry in Discharge Products of Li–O₂ Batteries

et al. 2018

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Li–Air Batteries: Discharge Products

Wang

2018

Metal‐Air Batteries

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Advances in Manganese‐Based Oxides Cathodic Electrocatalysts for Li–Air Batteries

Bao

Sun

Liu

et al. 2018

Adv Funct Materials

128

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Li-air batteries, characteristic of superhigh theoretical specific energy density, cost-efficiency, and environment-friendly merits, have aroused ever-increasing attention. Nevertheless, relatively low Coulomb efficiency, severe potential hysteresis, and poor rate capability, which mainly result from sluggish oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) kinetics, as well as pitiful cycle stability caused by parasitic reactions, extremely limit their practical applications. Manganese (Mn)-based oxides and their composites can exhibit high ORR and OER activities, reduce charge/discharge overpotential, and improve the cycling stability when used as cathodic catalyst materials. Herein, energy storage mechanisms for Li-air batteries are summarized, followed by a systematic overview of the progress of manganesebased oxides (MnO 2 with different crystal structures, MnO, MnOOH, Mn 2 O 3 , Mn 3 O 4 , MnOx, perovskite-type and spinel-type manganese oxides, etc.) cathodic materials for Li-air batteries in the recent years. The focus lies on the effects of crystal structure, design strategy, chemical composition, and microscopic physical parameters on ORR and OER activities of variousMn-based oxides, and even the overall performance of Li-air batteries. Finally, a prospect of the research for Mn-based oxides cathodic catalysts in the future is made, and some new insights for more reasonable design of Mn-based oxides electrocatalysts with higher catalytic efficiency are provided.

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Nanosize stabilized Li-deficient Li2−xO2 through cathode architecture for high performance Li-O2 batteries

Cited by 44 publications

References 51 publications

Defect Chemistry in Discharge Products of Li–O₂ Batteries

Defect Chemistry in Discharge Products of Li–O₂ Batteries

Li–Air Batteries: Discharge Products

Advances in Manganese‐Based Oxides Cathodic Electrocatalysts for Li–Air Batteries

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Nanosize stabilized Li-deficient Li2−xO2 through cathode architecture for high performance Li-O2 batteries

Cited by 44 publications

References 51 publications

Defect Chemistry in Discharge Products of Li–O2 Batteries

Defect Chemistry in Discharge Products of Li–O2 Batteries

Li–Air Batteries: Discharge Products

Advances in Manganese‐Based Oxides Cathodic Electrocatalysts for Li–Air Batteries

Contact Info

Product

Resources

About

Defect Chemistry in Discharge Products of Li–O₂ Batteries

Defect Chemistry in Discharge Products of Li–O₂ Batteries