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Polydopamine-treated three-dimensional carbon fiber-coated separator for achieving high-performance lithium metal batteries

Title
Polydopamine-treated three-dimensional carbon fiber-coated separator for achieving high-performance lithium metal batteries
Authors
Oh, JeonghunJo, HearinLee, HongkyungKim, Hee-TakLee, Yong MinRyou, Myung-Hyun
DGIST Authors
Lee, Yong Min
Issue Date
2019-08
Citation
Journal of Power Sources, 430, 130-136
Type
Article
Article Type
Article
Author Keywords
Vapor-grown carbon fiberLi metal electrodePolydopamineLi dendriteDead li
Keywords
SOLID-ELECTROLYTE INTERPHASEGRAPHENE OXIDEANODECOMPOSITELAYERDEPOSITIONMATRIX
ISSN
0378-7753
Abstract
The development of safe and high-performance lithium (Li) metal anodes has been a challenging issue that has not been addressed for decades. In this study, we have developed a thermally stable polydopamine-treated three-dimensional (3D) carbon fiber-coated separator (P3D-CFS) using an economical and environment-friendly process. P3D-CFS has a conductive coating layer that is used as a 3D hosting structure, which does not cause morphological changes in the Li metal anode. As a result, the unit cells (LiMn2O4/Li metal) employing P3D-CFS improve the cycle performance and rate capability compared to commercial polyethylene (PE) separators. P3D-CFS maintained 83.1% of the initial discharge capacity at the 400th cycle, whereas bare PE maintains only 74.3% of the initial discharge capacity after the 250th cycle (C/2 = 0.5 mA cm−2). P3D-CFS maintains 42.8% of the initial discharge capacity at a 7C rate (7 mA cm−2), whereas only 0.19% is maintained by bare PE under the same condition. Owing to the thermally stable properties of P3D-CFS, the open-circuit voltage of the unit cells (LiMn2O4/graphite) that employed P3D-CFS is maintained for over 60 min at 140 °C, whereas the unit cells that employed bare PE show a sudden voltage drop after only 3 min. © 2019 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/9893
DOI
10.1016/j.jpowsour.2019.05.003
Publisher
Elsevier BV
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


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