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Unusual Na+ Ion Intercalation/Deintercalation in Metal-Rich Cu1.8S for Na-Ion Batteries

Title
Unusual Na+ Ion Intercalation/Deintercalation in Metal-Rich Cu1.8S for Na-Ion Batteries
Author
송태섭
Keywords
metal sulfide; digenite Cu1.8S; intercalation; anode; sodium ion batteries
Issue Date
2018-03
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 12, no. 3, page. 2827-2837
Abstract
A key issue with Na-ion batteries is the development of active materials with stable electrochemical reversibility through the understanding of their sodium storage mechanisms. We report a sodium storage mechanism and properties of a new anode material, digenite Cu1.8S, based on its crystallographic study. It is revealed that copper sulfides (CuxS) can have metal-rich formulas (x >= 1.6), due to the unique oxidation state of +1 found in group 11 elements. These phases enable the unit cell to consist of all strong Cu-S bonds and no direct S-S bonds, which are vulnerable to external stress/strain that could result in bond cleavage as well as decomposition. Because of its structural rigidness, the Cu1.8S shows an intercalation/deintercalation reaction mechanism even in a low potential window of 0.1-2.2 V versus Na/Na+ without irreversible phase transformation, which most of the metal sulfides experience through a conversion reaction mechanism. It uptakes, on average, 1.4 Na+ ions per unit cell (similar to 250 mAh g(-1)) and exhibits similar to 100% retention over 1000 cycles at 2C in a tuned voltage range of 0.5-2.2 V through an overall solid solution reaction with negligible phase separation.
URI
https://pubs.acs.org/doi/10.1021/acsnano.8b00118https://repository.hanyang.ac.kr/handle/20.500.11754/117823
ISSN
1936-0851; 1936-086X
DOI
10.1021/acsnano.8b00118
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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