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Title: Revealing the Reaction Mechanism of Na–O 2 Batteries using Environmental Transmission Electron Microscopy

Due to its high energy efficiency, sodium-oxygen (Na-O 2) batteries have been extensively studied recently. One of the critical challenges for the development of the Na-O 2 battery is the elucidation of the reaction mechanism, the reaction products, and thestructural and chemical evolution of reaction product as well as their correlation with the battery performance. Herein, in-situ TEM was employed to probe the reaction mechanism and the structural evolution of the discharge products in Na-O 2 batteries. The discharge product is featured by the formation of both cubic and conformal NaO 2. It has been noticed that the impingement of reaction product (NaO 2) can lead to the coarsening of the particle through coalescence. We also investigated the stability of the discharge product, noticing that the reaction product NaO 2 is stable in the case of solid electrolyte. Here, the present work provide unprecedented insight for the development of the Na-O 2 batteries.
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [2] ; ORCiD logo [1]
  1. Hanyang Univ., Seoul (Republic of Korea)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Korea Institute of Science and Technology, Seoul (Republic of Korea)
Publication Date:
Report Number(s):
PNNL-SA-131396
Journal ID: ISSN 2380-8195; 49321; KP1704020
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 3; Journal Issue: 2; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Environmental Molecular Sciences Laboratory
OSTI Identifier:
1421331

Kwak, Won -Jin, Luo, Langli, Jung, Hun -Gi, Wang, Chongmin, and Sun, Yang -Kook. Revealing the Reaction Mechanism of Na–O2 Batteries using Environmental Transmission Electron Microscopy. United States: N. p., Web. doi:10.1021/acsenergylett.7b01273.
Kwak, Won -Jin, Luo, Langli, Jung, Hun -Gi, Wang, Chongmin, & Sun, Yang -Kook. Revealing the Reaction Mechanism of Na–O2 Batteries using Environmental Transmission Electron Microscopy. United States. doi:10.1021/acsenergylett.7b01273.
Kwak, Won -Jin, Luo, Langli, Jung, Hun -Gi, Wang, Chongmin, and Sun, Yang -Kook. 2018. "Revealing the Reaction Mechanism of Na–O2 Batteries using Environmental Transmission Electron Microscopy". United States. doi:10.1021/acsenergylett.7b01273. https://www.osti.gov/servlets/purl/1421331.
@article{osti_1421331,
title = {Revealing the Reaction Mechanism of Na–O2 Batteries using Environmental Transmission Electron Microscopy},
author = {Kwak, Won -Jin and Luo, Langli and Jung, Hun -Gi and Wang, Chongmin and Sun, Yang -Kook},
abstractNote = {Due to its high energy efficiency, sodium-oxygen (Na-O2) batteries have been extensively studied recently. One of the critical challenges for the development of the Na-O2 battery is the elucidation of the reaction mechanism, the reaction products, and thestructural and chemical evolution of reaction product as well as their correlation with the battery performance. Herein, in-situ TEM was employed to probe the reaction mechanism and the structural evolution of the discharge products in Na-O2 batteries. The discharge product is featured by the formation of both cubic and conformal NaO2. It has been noticed that the impingement of reaction product (NaO2) can lead to the coarsening of the particle through coalescence. We also investigated the stability of the discharge product, noticing that the reaction product NaO2 is stable in the case of solid electrolyte. Here, the present work provide unprecedented insight for the development of the Na-O2 batteries.},
doi = {10.1021/acsenergylett.7b01273},
journal = {ACS Energy Letters},
number = 2,
volume = 3,
place = {United States},
year = {2018},
month = {1}
}