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Title: Enhanced Cyclability of Lithium–Oxygen Batteries with Electrodes Protected by Surface Films Induced via In Situ Electrochemical Process

Journal Article · · Advanced Energy Materials
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [1];  [3];  [1];  [3]; ORCiD logo [1]
  1. Energy and Environment Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
  2. Physical Sciences Division Fundamental &, Computational Sciences Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
  3. Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland WA 99354 USA

Abstract Although the rechargeable lithium–oxygen (Li–O 2 ) batteries have extremely high theoretical specific energy, the practical application of these batteries is still limited by the instability of their carbon‐based air‐electrode, Li metal anode, and electrodes, toward reduced oxygen species. Here a simple one‐step in situ electrochemical precharging strategy is demonstrated to generate thin protective films on both carbon nanotubes (CNTs), air‐electrodes and Li metal anodes simultaneously under an inert atmosphere. Li–O 2 cells after such pretreatment demonstrate significantly extended cycle life of 110 and 180 cycles under the capacity‐limited protocol of 1000 mA h g −1 and 500 mA h g −1 , respectively, which is far more than those without pretreatment. The thin‐films formed from decomposition of electrolyte during in situ electrochemical precharging processes in an inert environment, can protect both CNTs air‐electrode and Li metal anode prior to conventional Li–O 2 discharge/charge cycling, where reactive reduced oxygen species are formed. This work provides a new approach for protection of carbon‐based air‐electrodes and Li metal anodes in practical Li–O 2 batteries, and may also be applied to other battery systems.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DEAC02‐05CH11231; DEAC02‐98CH10886; DE‐AC05‐76RLO1830
OSTI ID:
1415313
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 8 Journal Issue: 11; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 377 works
Citation information provided by
Web of Science

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