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High-capacity tungsten disulfide/graphene nanocomposite anodes for Na-ion batteries

27 February 2014

A team from the University of Wollongong (Australia) and the University of Technology, Sydney reported the successful synthesis by a simple hydrothermal approach of high-capacity WS2 (tungsten disulfide)@graphene nanocomposite anodes for sodium-ion batteries. Their paper is published in the RSC journal Chemical Communications.

Ws2
Schematic diagram of the WS2@graphene nanocomposites. Su et al. Click to enlarge.

XRD, FESEM, and TEM analyses of the prepared material showed that the WS2 nanocrystals were homogeneously distributed on the graphene nanosheets.

Anodes were prepared by dispersing 70 wt. % as-prepared materials, 20 wt. % acetylene carbon black, and 10 wt. % PVDF binder in N-methyl-2-pyrrolidone (NMP) to form a slurry. The resultant slurry was pasted onto copper foil using a doctor blade and dried in a vacuum oven for 12 h, which was followed by pressing at 200 kg cm-2. The typical loading of each electrode was approximately 1.2 mg cm-2.

Electrochemical measurements were carried out using two-electrode coin cells (CR2032) with Na metal as reference and counter electrode and glass microfiber as the separator.

… the WS2@graphene nanocomposite showed its highly reactive nature towards sodium storage. It demonstrated a high reversible specific capacity of about 594 mA h g-1, excellent cyclability, and a good high rate performance, which could be ascribed to the highly conductive graphene matrix and the unique 3D architecture of the nanocomposite. WS2@graphene nanocomposite is a promising high performance anode material for Na-ion batteries.

—Su et al.

Resources

  • Dawei Su, Shi Xue Dou and Guoxiu Wang (2014) “WS2@graphene Nanocomposites as Anode Materials for Na-ion Batteries with Enhanced Electrochemical Performances” Chem. Commun. doi: 10.1039/C4CC00840E

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Comments

When is production launch to be anticipated?

It would also be nice to see some graphs on it's cycle life vs. capacity...but it may be too early for that???

This is one more of the 1001 ways to manufacture future improved batteries.

Given this is from Australia, The Land that Innovation Forgot, don't hold your breath waiting for commercialisation anytime soon.

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