Journal
CHEMSUSCHEM
Volume 11, Issue 17, Pages 2981-2986Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201801017
Keywords
batteries; composite; electrolyte; lithium-ion; Li-S battery
Funding
- Chalmers Areas of Advance Materials Science and Energy, FORMAS
- Swedish Energy Agency
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [NRF-2017R1A4A1015711]
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We report a new Li-S cell concept based on an optimized F-free catholyte solution and a high loading nanostructured C/S composite cathode. The Li2S8 present in the electrolyte ensures both buffering against active material dissolution and Li+ conduction. The high S loading is obtained by confining elemental S (approximate to 80%) in the pores of a highly ordered mesopores carbon (CMK3). With this concept we demonstrate stabilization of a high energy density and excellent cycling performance over 500 cycles. This Li-S cell has a specific capacity that reaches over 1000 mA hg(-1), with an overall S loading of 3.6 mg cm(-2) and low electrolyte volume (i.e., 10 mu L cm(-2)), resulting in a practical energy density of 365 Wh kg(-1). The Li-S system proposed thus meets the requirements for large scale energy storage systems and is expected to be environmentally friendly and have lower cost compared with the commercial Li-ion battery thanks to the removal of both Co and F from the overall formulation.
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