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Shin, Tae Joo
Synchrotron Radiation Research Lab.
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Understanding the Critical Role of the Ag Nanophase in Boosting the Initial Reversibility of Transition Metal Oxide Anodes for Lithium-Ion Batteries

Author(s)
Lee, DaeheeWu, MihyeKim, Dong-HyunChae, ChangjuCho, Min KyungKim, Ji-YoungLee, Sun SookChoi, SunghoChoi, YoungminShin, Tae JooChung, Kyung YoonJeong, SunhoMoon, Jooho
Issued Date
2017-07
DOI
10.1021/acsami.7b01559
URI
https://scholarworks.unist.ac.kr/handle/201301/22385
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acsami.7b01559
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.26, pp.21715 - 21722
Abstract
The initial reversible capacity, a critical impediment in transition metal oxide-based anodes, is augmented in conversion-reaction-involved CoO anodes for lithium-ion batteries, by incorporating a chemically synthesized Ag nanophase. With an increase in the added amount of Ag nanophase from 5 to 15 wt %, the initial capacity loss decreases linearly up to 31.7%. The Ag nanophase maintains its pristine metallic nature without undergoing phase transformations, even during repeated vigorous electrochemical reactions of the active CoO phase. Complementary ex situ chemical/physical analyses suggest that the Ag nanophase promotes the catalytic generation of reversible gel-like/polymeric films wherein lithium ions are stored capacitively in the low-voltage region below 0.7 V during discharging. These scientific findings would provide a heretofore unrecognized pathway to resolving a major issue associated with the critical irreversibility in conversion-type transition metal oxide anodes.
Publisher
AMER CHEMICAL SOC
ISSN
1944-8244
Keyword (Author)
Lithium-ion batteryconversion-type anodecobalt oxideAg nanophaseinitial Coulombic efficiency
Keyword
ELECTRODE MATERIALSCAPACITYLIREACTIVITYNANOPARTICLESSTORAGEORIGINLAYERCOO

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