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Improved performance of dual carbon battery with new electrolyte mixture

11 August 2014

Prof. Dr. Martin Winter and his colleagues at the University of Münster report promising results for the use of graphite as both the anode and cathode material in a so-called “dual-graphite” or “dual-carbon” cell (earlier post) based on anion intercalation. Dr. Winter and his colleagues have been working with anion intercalation in dual carbon cells for several years. (Because both cations and anions participate in the charge/discharge reaction and other anode materials than graphite are possible, the Münster team earlier proposed the name “dual-ion cells” for these systems.)

In such a cell, the electrolyte cations intercalate into the graphite anode and the electrolyte anions intercalate into the graphite cathode during charge. On discharge, cations and anions are released back into the electrolyte.

A major goal for such as system is to find suitable electrolyte mixtures which exhibit not only a high oxidative stability at the cathode but also form a stable solid electrolyte interphase (SEI) at the graphite anode, they note. Of particular interest are electrolytes which display a high stability vs. oxidation due to the very high operation potentials of the cathode, which may exceed 5 V vs. Li/Li+

In their latest report, published in the RSC journal Energy & Environmental Science they used as an electrolyte system the ionic liquid-based electrolyte mixture Pyr14TFSI-LiTFSI in combination with the SEI-forming additive ethylene sulfite (ES). This combination allows a stable and highly reversible Li+ ion and TFSI- anion intercalation/de-intercalation into/from the graphite anode and cathode, respectively.

With the addition of ES, the discharge capacity for the anion intercalation can be remarkably increased from 50 mAh g-1 to 97 mAh g-1.

Resources

  • Sergej Rothermel, Paul Meister, Guido Schmuelling, Olga Fromm, Hinrich-Wilhelm Meyer, Sascha Nowak, Martin Winter and Tobias Placke (2014) “Dual-Graphite Cells based on the Reversible Intercalation of Bis(trifluoromethanesulfonyl)imide Anions from an Ionic Liquid Electrolyte” Energy Environ. Sci. doi: 10.1039/C4EE01873G

  • Tobias Placke, Olga Fromm, Simon Franz Lux, Peter Bieker, Sergej Rothermel, Hinrich-Wilhelm Meyer, Stefano Passerini and Martin Winter (2012) “Reversible Intercalation of Bis(trifluoromethanesulfonyl)imide Anions from an Ionic Liquid Electrolyte into Graphite for High Performance Dual-Ion Cells” J. Electrochem. Soc. volume 159, issue 11, A1755-A1765 doi: 10.1149/2.011211jes

August 11, 2014 in Brief | Permalink | Comments (3) | TrackBack (0)

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Comments

awesome...

Yeah yeah, we keep hearing regularly about improved batteries but as of today we still have regular commercial batteries that are too costly and not powerful enouph to replace all these polluting ice gasoline diesel cars and trucks and trains and airplanes and ships and big tractors. i live in a clean place where there is Wind and not too much cars and trucks but in other parts of the world the situation is critical like paris France with their diesel fumes or some big cities in china or South california that are over the limits of air polution in smog and particulate and soot and carbon monoxide. Even in South california there is numerous drivers that choose big polluting vehicle like suv or pick up trucks or diesel volkwagen or bmw.

What's the energy density for this lab experiment?

When and how much? Let me know when they are for sale; otherwise,.....just more vapor!

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