Scaffold-structured polymer binders for long-term cycle performance of stabilized lithium-powder electrodes. (20th December 2020)

• Record Type: Journal Article
• 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
• Is Part Of: Electrochimica acta. Volume 364(2020)
• Publication Date: 2020-12-20
• Subjects: Stabilized li metal powder -- Li-metal electrode -- High power capability -- polyimide -- Li dendrite suppression; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136878
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: PI polymeric binder creates a scaffold structure LiMP (Li metal powder)-based anode. LiMP-based anode fabrication process using PI binder is economical and at easy. PI polymeric binder forms a uniform protection layer on the limp-based anode. Surface coating layer formed by PI binder deteriorates li dendrite formation. A scaffold structure LiMP retains own structure deteriorating li dendrite formation. 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. Graphical abstract: Image, graphical abstract