Synthesis and characterization of different MnO2 morphologies for lithium-air batteries

Choi, Han Suk; Jang, Hye-Jin; Hwang, Hyein; Choi, Mincheol; Lim, Dongwook; Shim, Sang Eun; Baeck, Sung‐Hyeon

doi:10.1007/s13391-014-4066-x

Cited by 14 publications

(2 citation statements)

References 28 publications

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“…The change of the XRD patterns indicated that the annealing process could significantly improve the crystallinity of NMO, but as mentioned above, the P 2 -type layered NMO suffered from limited specific capacity and poor cycling life in the Na-ion intercalation and deintercalation process because the unavoidable Jahn–Teller effect resulted in phase transition at a high voltage. With a further increase of the annealing temperature to 800 °C, the crystalline structure of 800-aNMO was totally changed, compared to that of 700-aNMO, and the XRD pattern of 800-aNMO was similar to that of a mixture of the raw materials; the feature peak at 16.15° disappeared, a new peak at 12.5° was observed, which indicates that high-temperature annealing caused phase separation of NMO.…”

Section: Resultsmentioning

confidence: 95%

Improving the Comprehensive Performance of Na_0.7MnO₂ for Sodium Ion Batteries by ZrO₂ Atomic Layer Deposition

Han

Walsh

Liu

2021

ACS Appl. Mater. Interfaces

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Sodium ion batteries with Na−Mn−O compounds as cathodes have been widely studied as substitutes for lithium ion batteries due to their abundant resources. However, the relatively poor cycling stability and low capacity of Na−Mn−O compounds significantly limit their applications. Different approaches, including element substitution and surface modification, have been applied to improve the electrochemical performance of those cathode materials. Herein, element doping and coating of ZrO 2 on Na 0.7 MnO 2 particles have been achieved by atomic layer deposition followed by post-annealing. The rate capability and cycling stability of the modified materials were significantly improved, and the mechanism of performance enhancement was revealed. The ZrO 2 coatings acted as a stable interfacial layer to enhance the cycling stability of Na 0.7 MnO 2 by suppressing side reactions between the electrode and electrolyte. The doping of transition metal ions reduced energy barriers for sodium ion insertion and deintercalation during charge/discharge cycling, further improving the charge/discharge capacity and rate performance of Na 0.7 MnO 2 .

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Section: Resultsmentioning

confidence: 95%

Improving the Comprehensive Performance of Na_0.7MnO₂ for Sodium Ion Batteries by ZrO₂ Atomic Layer Deposition

Han

Walsh

Liu

2021

ACS Appl. Mater. Interfaces

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“…Transition metal oxides and perovskites are convinced as the electrocatalysts with best performance to replace the expensive noble metal oxides in some studies (Cheng & Chen, 2012;Choi et al, 2014). Because of their abundance and high OER performance, perovskites have been used in the area of fuel cells and metal-air batteries (Shin, 2016).…”

Section: Earth-abundant Metal Oxides and Perovskite-type Catalystsmentioning

confidence: 99%

UQ eSpace

Li¹

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Climate change, especially global warming, which caused by increased concentrations of greenhouse gases in the atmosphere, has become more severe nowadays. When we burn fossil fuels, like coal, oil and natural gas, to create power, we release carbon dioxide pollution into the atmosphere. Worse still, according to the International Energy Outlook report in 2018, the consumption of fossil fuels is expected to keep growing in the following decades with the increasing of the world population. To solve this problem, reducing the amount of electricity generated from fossil fuels and increasing the amount of power from renewable energy sources like wind and solar energy are becoming the trend. These renewables are intermittent and difficult to store in a large scale. Thus, techniques which can store renewables in a large-scale and produce less environmental pollution are required. Electrochemical water splitting has become one of the most promising technologies in recent years because it can produce hydrogen gas as pollution-free fuel from solar energy and other renewables. However, there is a hindrance for electrochemical water splitting system which is the sluggish oxygen evolution reaction. Researches have been carried out to synthesize catalysts for accelerating the reaction. In this project, lanthanum, strontium, cobalt and cerium based perovskite electrocatalysts were synthesized based on the previous study. To investigate and compare their catalytic performance, characterization tests and electrochemical tests were performed. In the end, we found that La0.5Sr0.5CoO3 has the best catalytic performance among six samples and further study is well worth doing to increase the ratio of cerium.

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Multi-wall carbon nanotube-embedded lithium cobalt phosphate composites with reduced resistance for high-voltage lithium-ion batteries

Kim

Rustomji

Cho

et al. 2016

Electron. Mater. Lett.

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Synthesis and characterization of different MnO2 morphologies for lithium-air batteries

Cited by 14 publications

References 28 publications

Improving the Comprehensive Performance of Na_0.7MnO₂ for Sodium Ion Batteries by ZrO₂ Atomic Layer Deposition

Improving the Comprehensive Performance of Na_0.7MnO₂ for Sodium Ion Batteries by ZrO₂ Atomic Layer Deposition

UQ eSpace

Multi-wall carbon nanotube-embedded lithium cobalt phosphate composites with reduced resistance for high-voltage lithium-ion batteries

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Synthesis and characterization of different MnO2 morphologies for lithium-air batteries

Cited by 14 publications

References 28 publications

Improving the Comprehensive Performance of Na0.7MnO2 for Sodium Ion Batteries by ZrO2 Atomic Layer Deposition

Improving the Comprehensive Performance of Na0.7MnO2 for Sodium Ion Batteries by ZrO2 Atomic Layer Deposition

UQ eSpace

Multi-wall carbon nanotube-embedded lithium cobalt phosphate composites with reduced resistance for high-voltage lithium-ion batteries

Contact Info

Product

Resources

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Improving the Comprehensive Performance of Na_0.7MnO₂ for Sodium Ion Batteries by ZrO₂ Atomic Layer Deposition

Improving the Comprehensive Performance of Na_0.7MnO₂ for Sodium Ion Batteries by ZrO₂ Atomic Layer Deposition