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Scaffold-structured polymer binders for long-term cycle performance of stabilized lithium-powder electrodes

Title
Scaffold-structured polymer binders for long-term cycle performance of stabilized lithium-powder electrodes
Authors
Jin, DaheeBae, Hyeon-SuHong, JinseokKim, SojinOh, JeounghunKim, KyumanJo, TaejinLee, Yong MinLee, Young-GiRyou, Myung-Hyun
DGIST Authors
Jin, Dahee; Bae, Hyeon-Su; Hong, Jinseok; Kim, Sojin; Oh, Jeounghun; Kim, Kyuman; Jo, Taejin; Lee, Yong Min; Lee, Young-Gi; Ryou, Myung-Hyun
Issue Date
2020-12
Citation
Electrochimica Acta, 364, 136878
Type
Article
Article Type
Article
Author Keywords
Stabilized Ii metal powderLi-metal electrodeHigh power capabilitypolyimideLi dendrite suppression
Keywords
METAL ANODESPOLYIMIDE BINDERVOLUME-CHANGEIONSURFACELAYERGENERATIONDEPOSITIONMATRIXLIFE
ISSN
0013-4686
Abstract
Effects of soluble polyimide (PI) binders on large-sized Li anodes (width = 21.5 cm; thickness = 40 μm) prepared using Li-metal powder (LiMP) have been investigated. PI binders form a uniform protective layer on exposed Li-powder-coated surfaces, thereby resulting in formation of scaffold-structured LiMP-based anodes. Uniform PI surface films favor realization of Li plating on Li-metal surfaces by forming a smooth surface structure, and the three-dimensional insulating PI matrix functions as a buffer layer that absorbs volume change. Moreover, PI binders facilitate enhanced cohesion between LiMP particles. The above-described triple action of PI binders significantly reduces Li dendrites. Consequently, PI-containing LiMP-based metal anodes demonstrate enhanced electrochemical performance compared to both polymeric binders and bare Li-metal foils. Results obtained in this study reveal that LiMP-based anodes containing PI binders exhibit 89% (98.2 mAh g–1) discharge-capacity retention during the 200th cycle, whereas bare Li-metal foil demonstrates sudden degeneration during the 65th cycle. Furthermore, PI containing LiMP-based anodes exhibit improved rate capability compared to other polymeric binders considered in this study. © 2020 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/12705
DOI
10.1016/j.electacta.2020.136878
Publisher
Elsevier Ltd
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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