Electronic Materials Letters

The Korean Institute of Metals and Materials (대한금속재료학회)
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Electrochemical Behavior of $Li/LiV_3O_8$ Secondary Cells

  • Bak, Hyo Rim (Division of Materials Science and Engineering, Korea University) ;
  • Lee, Jae Ha (Division of Materials Science and Engineering, Korea University) ;
  • Kim, Bok Ki (Department of Electronic Engineering, Kwangwoon University) ;
  • Yoon, Woo Young (Division of Materials Science and Engineering, Korea University)
  • Published : 2013.03.20
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Abstract

Li/$LiV_3O_8$ secondary cells with Li-foil and Li-powder anodes were fabricated, and their electrical properties were compared. Using the powder anode, a cell with an initial discharge capacity of 260 mAh $g^{-1}$ that could be operated for over 100 cycles was obtained. The porous Li-powder electrode was safely synthesized by pressing an emulsion droplet onto an SUS mesh. A threefold increase in the electrical conductivity of the $LiV_3O_8$ cathode was achieved by the addition of carbon using a vibration pot mill. Using the powder anode resulted in 80% capacity retention at the $100^{th}$ cycle, while that using the foil electrode was 46%; the 1.0 C-rate/0.1 C-rate capacity ratio also increased from 44% to 60%. A cell employing the $LiV_3O_8$-carbon composite cathode showed better electrical performance, a capacity retention of 90% after 50 cycles, and an increase in rate capacity ratio. The crystal structure and morphology of the $LiV_3O_8$-C composite were investigated by x-ray diffraction and scanning electron microscopy.

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