Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries
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...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/141451 |
| _version_ | 1824453295880536064 |
|---|---|
| author | Park, Hyunjung Kwon, Jiseok Choi, Heechae Shin, Donghyeok Song, Taeseup Lou, David Xiong Wen |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Park, Hyunjung Kwon, Jiseok Choi, Heechae Shin, Donghyeok Song, Taeseup Lou, David Xiong Wen |
| author_sort | Park, Hyunjung |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T07:58:05Z |
| format | Journal Article |
| id | ntu-10356/141451 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:58:05Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1414512020-06-08T08:43:16Z Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries Park, Hyunjung Kwon, Jiseok Choi, Heechae Shin, Donghyeok Song, Taeseup Lou, David Xiong Wen School of Chemical and Biomedical Engineering Engineering::Chemical engineering Metal Sulfide Digenite Cu1.8S 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. 2020-06-08T08:43:15Z 2020-06-08T08:43:15Z 2018 Journal Article 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 1936-0851 https://hdl.handle.net/10356/141451 10.1021/acsnano.8b00118 29505231 2-s2.0-85044502946 3 12 2827 2837 en ACS Nano © 2018 American Chemical Society. All rights reserved. |
| spellingShingle | Engineering::Chemical engineering Metal Sulfide Digenite Cu1.8S Park, Hyunjung Kwon, Jiseok Choi, Heechae Shin, Donghyeok Song, Taeseup Lou, David Xiong Wen 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 |
| title_full | Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries |
| title_fullStr | Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries |
| title_full_unstemmed | Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries |
| title_short | Unusual Na+ ion intercalation/deintercalation in metal-rich Cu1.8S for Na-ion batteries |
| title_sort | unusual na ion intercalation deintercalation in metal rich cu1 8s for na ion batteries |
| topic | Engineering::Chemical engineering Metal Sulfide Digenite Cu1.8S |
| url | https://hdl.handle.net/10356/141451 |
| work_keys_str_mv | AT parkhyunjung unusualnaionintercalationdeintercalationinmetalrichcu18sfornaionbatteries AT kwonjiseok unusualnaionintercalationdeintercalationinmetalrichcu18sfornaionbatteries AT choiheechae unusualnaionintercalationdeintercalationinmetalrichcu18sfornaionbatteries AT shindonghyeok unusualnaionintercalationdeintercalationinmetalrichcu18sfornaionbatteries AT songtaeseup unusualnaionintercalationdeintercalationinmetalrichcu18sfornaionbatteries AT loudavidxiongwen unusualnaionintercalationdeintercalationinmetalrichcu18sfornaionbatteries |