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Title: Operando liquid cell electron microscopy of discharge and charge kinetics in lithium-oxygen batteries

Journal Article · · Nano Energy
 [1];  [2];  [3];  [1];  [1]; ORCiD logo [4]; ORCiD logo [2];  [1]
  1. Univ. of Illinois at Chicago, Chicago, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Illinois at Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Imam Abdulrahman Bin Faisal Univ. (IAU), Dammam (Saudi Arabia); Stanford Univ., Stanford, CA (United States)

Despite the promising future of lithium-oxygen (Li-O2) battery in replacing conventional lithium ion battery for high-energy applications, the complicated reaction mechanisms determining the sluggish discharge-charge kinetics have not been fully understood. Here, utilizing in situ liquid transmission electron microscopy, the (electro) chemical fundamentals in a working Li-O2 battery is explored. During discharge, the nucleation of Li2O2 is observed at the carbon electrode/electrolyte interface, and the following growth process exhibits Li+ diffusion-limited kinetics. Nucleation and growth of Li2O2 are also observed within the electrolyte, where there is no direct contact with the carbon electrode indicating the existence of non-Faradaic disproportionation reaction of intermediate LiO2 into Li2O2. The growth of Li2O2 isolated in the electrolyte exhibits O2- diffusion-limited kinetics. Li2O2 at the carbon electrode surface and isolated in the electrolyte are both active upon charging and gradually decomposed. For Li2O2 particles rooted at the carbon electrode surface, the decomposition starts at the electrode/Li2O2 interface indicating electron-conduction limited charge kinetics. For Li2O2 isolated within the electrolyte, surprisingly, a side-to-side decomposition mode is identified indicating the non-Faradaic formation of dissolvable O2-, whose diffusion in the electrolyte controls the overall charge kinetics. In conclusion, this work reveals further details of underlying mechanisms in a working Li-O2 battery and identifies various limiting factors controlling the discharge and charge processes.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
Grant/Contract Number:
AC02-06CH11357; 4J-30361
OSTI ID:
1461336
Alternate ID(s):
OSTI ID: 1496465
Journal Information:
Nano Energy, Vol. 49, Issue C; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (14)

Reducing the overpotential of an aprotic Li–O 2 battery using a conductive graphene interlayer journal January 2019
Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials journal September 2019
Understanding the Reaction Interface in Lithium-Oxygen Batteries journal October 2018
In Situ Transmission Electron Microscopy Studies of Electrochemical Reaction Mechanisms in Rechargeable Batteries journal June 2019
Understanding the Reaction Chemistry during Charging in Aprotic Lithium–Oxygen Batteries: Existing Problems and Solutions journal February 2019
An in situ constructed topological rich vacancy-defect nitrogen-doped nanocarbon as a highly-effective metal-free oxygen catalyst for Li–O 2 batteries journal January 2019
Electron microscopy and its role in advanced lithium-ion battery research journal January 2019
Liquid cell with temperature control for in situ TEM chemical studies journal December 2018
Imaging of soft materials using in situ liquid-cell transmission electron microscopy journal January 2019
Isotopic Labeling Reveals Active Reaction Interfaces for Electrochemical Oxidation of Lithium Peroxide journal May 2019
The Absence and Importance of Operando Techniques for Metal‐Free Catalysts journal November 2018
Pyridinic-N-dominated carbon frameworks with porous tungsten trioxide nano-lamellae as a promising bi-functional catalyst for Li–oxygen batteries journal January 2018
Investigation of the magnetosome biomineralization in magnetotactic bacteria using graphene liquid cell – transmission electron microscopy journal January 2019
Understanding the Reaction Interface in Lithium-Oxygen Batteries journal January 2019