Conductive porous carbon film as a lithium metal storage medium

Hee Kook Kang, Sang Gil Woo, Jae Hun Kim, Seong Rae Lee, Young Jun Kim

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number25265
Pages (from-to)172-178
Number of pages7
JournalElectrochimica Acta
Volume176
DOIs
Publication statusPublished - 2015 Jul 15

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Keywords

  • coulombic efficiency
  • dendrite
  • lithium deposition
  • lithium metal anode
  • lithium metal battery

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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