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Effect of Pth-Coated Li Powder Anode in Lithium Metal Batteries System
Effect of Pth-Coated Li Powder Anode in Lithium Metal Batteries System
Tuesday, October 13, 2015
West Hall 1 (Phoenix Convention Center)
The Li metal anode is one of interested electrode which applied on the post-LIB (Li ion battery) system. However the dendrite growth on the Li surface made hard to commercialized Li metal anode battery. In this reason, we fabricated Li powder by Droplet Emulsion Technique (DET) and coated polythiophene (Pth) on the Li powder by polymerization method.[1] The thiophene monomer and FeCl3 was stirred in CHCl3 solution and polymerized by in situ on the surface of lithium powder.[2] This experiment formatted uniformly PTh layer on the Li powder surface. This Pth layer was helpful to suppressed the lithium dendrite growth when Li ion deposited on the Li powder (charge process). To fabricate the electrode Pth-coated lithium powder was placed on the stainless steel (SUS) mesh (15 Φ) and pressed 20 kg cm-2 regularly. Also the LiV3O8 (LVO) was used as cathode electrode because it is non-lithiated material. The cell was assembled in the coin type cell (CR2032) in Dry room.
The morphology of lithium dendrite was observed by the FE-SEM, TEM and the coating layer was investigated by NMR and FT-IR. The conductivity of lithium powder anode and polythiophene-coated lithium powder was also measured by impedance analysis. All the cell were charged and discharged to 25% of the theoretical lithium capacity (965 mAhg-1) at 0.2 0.5, 1, 2 C-rate respectively. The result was analyzed EIS and CV.