Hard Carbon Anodes and Novel Electrolytes for Long-Cycle-Life Room Temperature Sodium-Sulfur Full Cell Batteries

Kohl M, Borrmann F, Althues H, Kaskel S (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Advanced Energy Materials Wiley

Book Volume: 6

Article Number: 1502185

Journal Issue: 6

DOI: 10.1002/aenm.201502185

Abstract

A novel combination of hard carbon anode sodium pre-loading and a tailored electrolyte is used to prepare room temperature sodium-sulfur full cell batteries. The electrochemical loading with sodium ions is realized in a specific mixture of diethyl carbonate, ethylene carbonate, and fluoroethylene carbonate electrolyte in order to create a first solid electrolyte interface (SEI) on the anode surface. Combining such anodes with a porous carbon/sulfur composite cathode results in full cells with a significantly decreased polysulfide shuttle when compared to half cells combined with metallic sodium anodes. Further optimization involves the use of Na2S/P2S5 doped tetraethylene glycol dimethyl ether based electrolyte in the full cell for the formation of a second SEI, reducing polysulfide shuttle even further. More importantly, the electrochemical discharge processes in the cell are improved by adding this dissolved complexation agent to the electrolyte. As a result of this combination sodium-sulfur cells with tailored cathode materials and electrolytes can achieve high discharge capacities up to 980 mAh g^-1 sulfur and 1000 cycles with 200 mAh g^-1 sulfur remaining capacity, at room temperature.

Involved external institutions

Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS) / Fraunhofer Institute for Material and Beam Technology

Germany (DE)

How to cite

APA:

Kohl, M., Borrmann, F., Althues, H., & Kaskel, S. (2016). Hard Carbon Anodes and Novel Electrolytes for Long-Cycle-Life Room Temperature Sodium-Sulfur Full Cell Batteries. Advanced Energy Materials, 6(6). https://doi.org/10.1002/aenm.201502185

MLA:

Kohl, M., et al. "Hard Carbon Anodes and Novel Electrolytes for Long-Cycle-Life Room Temperature Sodium-Sulfur Full Cell Batteries." Advanced Energy Materials 6.6 (2016).

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