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Mechanism for Preserving Volatile Nitrogen Dioxide and Sustainable Redox Mediation in the Nonaqueous Lithium-Oxygen Battery
- Source :
- ACS applied materialsinterfaces. 13(7)
- Publication Year :
- 2021
-
Abstract
- Excessive overpotential during charging is a major hurdle in lithium-oxygen (Li-O2) battery technology. NO2-/NO2 redox mediation is an efficient way to substantially reduce the overpotential and to enhance oxygen efficiency and cycle life by suppressing parasitic reactions. Considering that nitrogen dioxide (NO2) is a gas, it is quite surprising that NO2-/NO2 redox reactions can be sustained for a long cycle life in Li-O2 batteries with such an open structure. A detailed study with in situ differential electrochemical mass spectrometry (DEMS) elucidated that NO2 could follow three reaction pathways during charging: (1) oxidation of Li2O2 to evolve oxygen, (2) vaporization, and (3) conversion into NO3-. Among the pathways, Li2O2 oxidation occurs exclusively in the presence of Li2O2, which suggests that NO2 has high reactivity to Li2O2. At the end of the charging process, most of the volatile oxidized couple (NO2) is stored by conversion to a stable third species (NO3-), which is then reused for producing the reduced couple (NO2-) in the next cycle. The dominant reaction of Li2O2 oxidation involves the temporary storage of NO2 as a stable third species during charging, which is an innovative way for preserving the volatile redox couple, resulting in a sustainable redox mediation for a high-performance Li-O2 battery.
- Subjects :
- inorganic chemicals
Battery (electricity)
Materials science
chemistry.chemical_element
02 engineering and technology
respiratory system
Overpotential
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
complex mixtures
01 natural sciences
Oxygen
Redox
respiratory tract diseases
0104 chemical sciences
chemistry.chemical_compound
chemistry
Chemical engineering
General Materials Science
Nitrogen dioxide
Reactivity (chemistry)
Lithium
0210 nano-technology
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 13
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....412dfb4fe03ce85769eb4b2223471f8c