Conductive porous carbon film as a lithium metal storage medium. (10th September 2015)

• Record Type: Journal Article
• Authors: Kang, Hee-Kook; Woo, Sang-Gil; Kim, Jae-Hun; Lee, Seong-Rae; Kim, Young-Jun
• Is Part Of: Electrochimica acta. Volume 176(2015)
• Page Start: 172
• Page End: 178
• Publication Date: 2015-09-10
• Subjects: lithium metal battery -- lithium metal anode -- lithium deposition -- dendrite -- coulombic efficiency; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.06.140
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Conductive porous carbon films were prepared by distributing amorphous carbon nanoparticles. The porous film provides enough conductive surfaces and reduces the effective current density. By using the film, dendritic Li growth can be effectively prevented. The use of the porous framework can be extended for use in other 3D structured materials for efficient Li metal storage. Abstract: The Li metal anode boasts attractive electrochemical characteristics for use in rechargeable Li batteries, such as a high theoretical capacity and a low redox potential. However, poor cycle efficiency and safety problems relating to dendritic Li growth during cycling should be addressed. Here we propose a strategy to increase the coulombic efficiency of the Li metal electrode. Conductive porous carbon films (CPCFs) were prepared by distributing amorphous carbon nanoparticles within a polymer binder. This porous structure is able to provide enough conductive surfaces for Li deposition and dissolution, which reduce the effective current density. Moreover, the pores in these films enable the electrolyte to easily penetrate into the empty space, and Li can be densely deposited between the carbon particles. As a result, dendritic Li growth can be effectively prevented. Electrochemical tests demonstrate that the coulombic efficiency of the porous electrode can be greatly improved compared to that of the pure Cu electrode. By allowing for the development of robust Li metal electrodes, this approach provides key insight into the design of high-capacity anodes for Li metal batteries, such as Li-air and Li-S systems.