Jz300480w singh presentation on li ion battery

Aug. 27, 2012
Jz300480w singh presentation on li ion battery
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Jz300480w singh presentation on li ion battery

Editor's Notes

  1. 1.WS2 is a 2-D structured TMDC, with W sandwiched between sulfur atoms. Each WS2 sheets are weakly bonded by vanDerWal forces. 2. Large scale functionalization, with dimension as large as possible is desired for use in industrial applications like energy storage, electronic switches and coatings. 3. Encouraged by the methodology of Prof. Coleman for exfoliating graphene sheets by organic solvents, generating surface charge and resulting in electrostatic repulsion.
  2. 4.Figure a- Comparison with organic solvents, showed most stable dispersion for WS2 in cholorosulfonic…it was stable even after few days. 5.Figure b- UV showing maximum absorption intensity for WS2 in superacid, confirms the visual observations 6.Figure c- Surface potential of the sheets, quantifies the charge on the surface results in repulsion force between the sheets which keeps them separated. 7. Figure d- TGA plot : Presence of functional groups on WS2 sheet surfaces are seen as weight loss when the exfoliated sheets are heated up to 200 C; then follows a typical weight WS 2 profile. 8. XPS characterizes the surface functionalization of sheets as W-O bonds are formed.
  3. And (c) are SEM and TEM images of as obtained untreated WS2 sheets and (b) and (d) are superacid treated sheets. Sizes ranged from about 3-5 micro meter large.
  4. Put the exfoliated WS 2 sheets into application and made LIB anodes. Figure a: First 2 EC cycles, when anode is cycled between 0 to 2.5 V at CC of 25mA/g. Left to right is Li-ion intercalation in the WS2 sheets and right to left is extraction. 3-phases representing diffusion rates and type of chemical reactions involved. Phase 2: conversion reaction ; Phase 3: decomposition of LixWOyS2 and electrolyte. Figure c: clearly depicts the 2 staged insertion cycle, whereas the dealloying is mostly a uniform diffusion rate process. Capacity fading for initial few cycles is probably due to electrolyte degradation (reported earlier as polysulfide formation).
  5. Stable C-rate performance is observed. As with increasing current extraction and insertion rates, the capacity for the initial and final cycles remains mostly constant. Exfoliated WS2 cycled at low rate exhibited high capacity, low ICL and low hysteresis.