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Title: Electrochemically Formed Ultrafine Metal Oxide Nanocatalysts for High-Performance Lithium–Oxygen Batteries

Abstract

Lithium-oxygen (Li-O2) battery has an extremely high theoretical specific energy density as compared with conventional energy storage systems. However, practical application of Li-O2 battery system still faces significant challenges, especially its poor cyclability. In this work, we report a new approach to synthesis ultrafine metal oxide nanocatalysts through an electrochemical pre-lithiation process. This process reduces the size of NiCo2O4 (NCO) particles from 20~30 nm to a uniformly distributed domain of ~ 2 nm and largely improved their catalytic activity. Structurally, the pre-lithiated NCO NWs are featured by ultrafine NiO/CoO nanoparticles, which show high stability during prolonged cycles in terms of morphology and the particle size, therefore maintaining an excellent catalytic effect to oxygen reduction and evolution reactions. Li-O2 battery using this catalyst has demonstrated an initial capacity of 29,280 mAh g-1 and has retained a stable capacity of over 1,000 mAh g-1 after 100 cycles based on the weight of NCO active material. Direct in-situ TEM observation conclusively reveals the lithiation/delithiation process of as-prepared NCO NWs, clarifying the NCO/Li electrochemical reaction mechanism that can be extended to other transition-metal oxides and providing the in depth understandings on the catalysts and battery chemistries of other ternary transition-metal oxides.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1298388
Report Number(s):
PNNL-SA-117155
Journal ID: ISSN 1530-6984; 48688; 48379; 49128; VT1201000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Letters; Journal Volume: 16; Journal Issue: 8
Country of Publication:
United States
Language:
English
Subject:
lithium-oxygen battery; ultra-fine catalyst; nanoparticle; NiCo2O4; pre-lithiation; Environmental Molecular Sciences Laboratory

Citation Formats

Liu, Bin, Yan, Pengfei, Xu, Wu, Zheng, Jianming, He, Yang, Luo, Langli, Bowden, Mark E., Wang, Chong-Min, and Zhang, Ji-Guang. Electrochemically Formed Ultrafine Metal Oxide Nanocatalysts for High-Performance Lithium–Oxygen Batteries. United States: N. p., 2016. Web. doi:10.1021/acs.nanolett.6b01556.
Liu, Bin, Yan, Pengfei, Xu, Wu, Zheng, Jianming, He, Yang, Luo, Langli, Bowden, Mark E., Wang, Chong-Min, & Zhang, Ji-Guang. Electrochemically Formed Ultrafine Metal Oxide Nanocatalysts for High-Performance Lithium–Oxygen Batteries. United States. doi:10.1021/acs.nanolett.6b01556.
Liu, Bin, Yan, Pengfei, Xu, Wu, Zheng, Jianming, He, Yang, Luo, Langli, Bowden, Mark E., Wang, Chong-Min, and Zhang, Ji-Guang. 2016. "Electrochemically Formed Ultrafine Metal Oxide Nanocatalysts for High-Performance Lithium–Oxygen Batteries". United States. doi:10.1021/acs.nanolett.6b01556.
@article{osti_1298388,
title = {Electrochemically Formed Ultrafine Metal Oxide Nanocatalysts for High-Performance Lithium–Oxygen Batteries},
author = {Liu, Bin and Yan, Pengfei and Xu, Wu and Zheng, Jianming and He, Yang and Luo, Langli and Bowden, Mark E. and Wang, Chong-Min and Zhang, Ji-Guang},
abstractNote = {Lithium-oxygen (Li-O2) battery has an extremely high theoretical specific energy density as compared with conventional energy storage systems. However, practical application of Li-O2 battery system still faces significant challenges, especially its poor cyclability. In this work, we report a new approach to synthesis ultrafine metal oxide nanocatalysts through an electrochemical pre-lithiation process. This process reduces the size of NiCo2O4 (NCO) particles from 20~30 nm to a uniformly distributed domain of ~ 2 nm and largely improved their catalytic activity. Structurally, the pre-lithiated NCO NWs are featured by ultrafine NiO/CoO nanoparticles, which show high stability during prolonged cycles in terms of morphology and the particle size, therefore maintaining an excellent catalytic effect to oxygen reduction and evolution reactions. Li-O2 battery using this catalyst has demonstrated an initial capacity of 29,280 mAh g-1 and has retained a stable capacity of over 1,000 mAh g-1 after 100 cycles based on the weight of NCO active material. Direct in-situ TEM observation conclusively reveals the lithiation/delithiation process of as-prepared NCO NWs, clarifying the NCO/Li electrochemical reaction mechanism that can be extended to other transition-metal oxides and providing the in depth understandings on the catalysts and battery chemistries of other ternary transition-metal oxides.},
doi = {10.1021/acs.nanolett.6b01556},
journal = {Nano Letters},
number = 8,
volume = 16,
place = {United States},
year = 2016,
month = 8
}