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Title: Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries
Authors: Park, Hyunjung
Kwon, Jiseok
Choi, Heechae
Shin, Donghyeok
Song, Taeseup
Lou, David Xiong Wen
Keywords: Engineering::Chemical engineering
Issue Date: 2018
Source: Park, H., Kwon, J., Choi, H., Shin, D., Song, T., & Lou, D. X. W. (2018). Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries. ACS Nano, 12(3), 2827-2837. doi:10.1021/acsnano.8b00118
Journal: ACS Nano
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 (∼250 mAh g–1) and exhibits ∼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.
ISSN: 1936-0851
DOI: 10.1021/acsnano.8b00118
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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