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

Abstract

Although the rechargeable lithium-oxygen (Li-O2) 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 electrolytes towards reduced oxygen species. Here we demonstrate a simple one-step in-situ electrochemical pre-charging strategy to generate thin protective films on both carbon nanotubes (CNTs) air-electrode and Li metal anode simultaneously under an inert atmosphere. Li-O2 cells after such pre-treatment demonstrate significantly extended cycle life of 110 and 180 cycles under the capacity-limited protocol of 1000 mAh g-1 and 500 mAh g-1, respectively, which is far more than those without pre-treatment. The thin-films formed from decomposition of electrolyte during in-situ electrochemical pre-charging process in an inert environment can protect both CNTs air-electrode and Li metal anode prior to conventional Li-O2 discharge/charge cycling where reactive reduced oxygen species are formed. This work provides a new approach for protections of carbon-based air-electrode and Li metal anode in practical Li-O2 batteries, and may also be applied to other battery systems.

Authors:
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
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1435886
Report Number(s):
PNNL-SA-128613
Journal ID: ISSN 1614-6832; 49321; VT1201000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Advanced Energy Materials; Journal Volume: 8; Journal Issue: 11
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Liu, Bin, Xu, Wu, Tao, Jinhui, Yan, Pengfei, Zheng, Jianming, Engelhard, Mark H., Lu, Dongping, Wang, Chongmin, and Zhang, Ji-Guang. Enhanced Cyclability of Lithium-Oxygen Batteries with Electrodes Protected by Surface Films Induced via In Situ Electrochemical Process. United States: N. p., 2018. Web. doi:10.1002/aenm.201702340.
Liu, Bin, Xu, Wu, Tao, Jinhui, Yan, Pengfei, Zheng, Jianming, Engelhard, Mark H., Lu, Dongping, Wang, Chongmin, & Zhang, Ji-Guang. Enhanced Cyclability of Lithium-Oxygen Batteries with Electrodes Protected by Surface Films Induced via In Situ Electrochemical Process. United States. doi:10.1002/aenm.201702340.
Liu, Bin, Xu, Wu, Tao, Jinhui, Yan, Pengfei, Zheng, Jianming, Engelhard, Mark H., Lu, Dongping, Wang, Chongmin, and Zhang, Ji-Guang. Tue . "Enhanced Cyclability of Lithium-Oxygen Batteries with Electrodes Protected by Surface Films Induced via In Situ Electrochemical Process". United States. doi:10.1002/aenm.201702340.
@article{osti_1435886,
title = {Enhanced Cyclability of Lithium-Oxygen Batteries with Electrodes Protected by Surface Films Induced via In Situ Electrochemical Process},
author = {Liu, Bin and Xu, Wu and Tao, Jinhui and Yan, Pengfei and Zheng, Jianming and Engelhard, Mark H. and Lu, Dongping and Wang, Chongmin and Zhang, Ji-Guang},
abstractNote = {Although the rechargeable lithium-oxygen (Li-O2) 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 electrolytes towards reduced oxygen species. Here we demonstrate a simple one-step in-situ electrochemical pre-charging strategy to generate thin protective films on both carbon nanotubes (CNTs) air-electrode and Li metal anode simultaneously under an inert atmosphere. Li-O2 cells after such pre-treatment demonstrate significantly extended cycle life of 110 and 180 cycles under the capacity-limited protocol of 1000 mAh g-1 and 500 mAh g-1, respectively, which is far more than those without pre-treatment. The thin-films formed from decomposition of electrolyte during in-situ electrochemical pre-charging process in an inert environment can protect both CNTs air-electrode and Li metal anode prior to conventional Li-O2 discharge/charge cycling where reactive reduced oxygen species are formed. This work provides a new approach for protections of carbon-based air-electrode and Li metal anode in practical Li-O2 batteries, and may also be applied to other battery systems.},
doi = {10.1002/aenm.201702340},
journal = {Advanced Energy Materials},
number = 11,
volume = 8,
place = {United States},
year = {Tue Jan 02 00:00:00 EST 2018},
month = {Tue Jan 02 00:00:00 EST 2018}
}