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Träfflista för sökning "WFRF:(Matic Aleksandar 1968) srt2:(2010-2014);pers:(Lim Du Hyun 1983)"

Sökning: WFRF:(Matic Aleksandar 1968) > (2010-2014) > Lim Du Hyun 1983

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1.
  • Kim, Jae-Kwang, 1978, et al. (författare)
  • Effect of carbon coating methods on structural characteristics and electrochemical properties of carbon-coated lithium iron phosphate
  • 2014
  • Ingår i: Solid State Ionics. - : Elsevier BV. - 0167-2738. ; 262, s. 25-29
  • Tidskriftsartikel (refereegranskat)abstract
    • The potential of LiFePO4 as cathode material has not been fully exploited due to its intrinsic poor electronic and ionic conductivities. Attempts have been made to improve these properties of which coating of the active carbon on the particle surface is the most viable method so far. Phase-pure LiFePO4 and two LiFePO4/C composites were synthesized by mechanical activation process employing two different methods: (i) direct addition of acetylene black carbon and (ii) addition of sucrose as carbon precursor. The samples were well characterized by various techniques like elemental analysis, Brunauer-Emmett-Teller (BET) method, scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Raman spectroscopy to establish their composition, morphology, particle size and surface area. The structure of these samples is investigated as olivine structure space group Prima by X-ray powder diffraction. Transmission electron microscopy (TEM) confirms that the carbon nanocoating on the LiFePO4 particles has no visible dislocations and fractures. The electrochemical performance of LiFePO4/C is significantly affected by the nature of the carbon nanocoating, which in turn is affected by the choice of synthesis method.
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2.
  • Raghavan, P., et al. (författare)
  • Electrochemical characterization of poly(vinylidene fluoride-co-hexafluoro propylene) based electrospun gel polymer electrolytes incorporating moth temperature ionic liquids as green electrolytes for lithium batteries
  • 2014
  • Ingår i: Solid State Ionics. - : Elsevier BV. - 0167-2738. ; 262, s. 77-82
  • Tidskriftsartikel (refereegranskat)abstract
    • A series of gel polymer electrolytes (GPEs) based on electrospun membranes of poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-co-HFP)] incorporating room temperature ionic liquids (RTILs), 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide complexed with lithium bis(trifluoromethylsulfonyl) inside (LiTFSI) as electrolytes have been prepared and their fundamental electrochemical properties were investigated. The morphology of electrospun membranes was examined by a field emission scanning electron microscope (FE-SEM). The membranes show uniform morphology with an average fiber diameter of 780 nm, high porosity and high electrolyte uptake. GPEs were prepared by soaking the electrospun membranes in 1 M LiTFSI in RTILs for 1 h and exhibit a high ionic conductivity of 2.4 x 10(-3)-4.5 x 10(-3) S cm(-1) at 25 degrees C. A Li/GPEs/LiFePO4 cell using these RTILs delivers high discharge capacity (similar to 140 mAh g(-1)) when evaluated at 25 degrees C at 0.1 C-rate and exhibits a very stable discharge capacity under continuous cycling. Among the GPEs, EMITFSI shows the highest electrochemical properties although the solid electrolyte interface (SEI) layer was not formed.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
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refereegranskat (2)
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Matic, Aleksandar, 1 ... (2)
Lim, Du Hyun, 19... (2)Ta bort avgränsningen
Ahn, J. H. (2)
Kim, Jae-Kwang, 1978 (2)
Zhao, X. (1)
Kim, D. S. (1)
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Jacobsson, Per, 1958 (1)
Choi, H. (1)
Chauhan, G. S. (1)
Raghavan, P. (1)
Nah, C. (1)
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Chalmers tekniska högskola (2)
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Engelska (2)
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Naturvetenskap (2)
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2014 (2)

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