• 제목/요약/키워드: polymer materials

검색결과 4,705건 처리시간 0.03초

Semi-interpenetrating Solid Polymer Electrolyte for LiCoO2-based Lithium Polymer Batteries Operated at Room Temperature

  • Nguyen, Tien Manh;Suk, Jungdon;Kang, Yongku
    • Journal of Electrochemical Science and Technology
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    • 제10권2호
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    • pp.250-255
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    • 2019
  • Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) show promise for improving the lithium ion battery safety. However, due to oxidation of the PEO group and corrosion of the Al current collector, PEO-based SPEs have not previously been effective for use in $LiCoO_2$ (LCO) cathode materials at room temperature. In this paper, a semi-interpenetrating polymer network (semi-IPN) PEO-based SPE was applied to examine the performance of a LCO/SPE/Li metal cell at different voltage ranges. The results indicate that the SPE can be applied to LCO-based lithium polymer batteries with high electrochemical performance. By using a carbon-coated aluminum current collector, the Al corrosion was mostly suppressed during cycling, resulting in improvement of the cell cycle stability.

Synthesis and Characterization of a Tetrathiafulvalene-Based Polymer

  • Lee, Se-Hyun;Wang, Lei;Hwang, Seok-Ho;Lee, Myong-Hoon;Jeong, Kwang-Un
    • Bulletin of the Korean Chemical Society
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    • 제33권5호
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    • pp.1451-1456
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    • 2012
  • A novel tetrathiafulvalene (TTF)-based main-chain polymer (6TTF-polymer) was successfully synthesized via a condensation polymerization between a newly synthesized dihydroxy TTF derivative and a malonyl chloride, and its chemical structure was characterized by spectroscopic techniques. Molecular weight of the 6TTF-polymer (9,030 g/mol by gel permeation chromatography) was large enough to form the ductile film. The electrochemical and optical properties of the 6TTF-polymer were further estimated by cyclic voltammetry, ultraviolet and photoluminescence spectroscopes. The highest occupied molecular orbital level ($E_{HOMO}$=-4.79 eV) and band-gap energy ($E_g$=1.91 eV) of the 6TTF-polymer suggested that TTF-based polymer could act as a good electron donating material for the optoelectronic applications.