Assembling and Performance comparision of Different cathode chemistries utilized in all-solid-state lithium-sulfur batteries

Kızılaslan A., Efe Ş., Akbulut H.

25th Topical Meeting of the International Society of Electrochemistry (ISE-2019), Toledo, Filipinler, 12 - 15 Mayıs 2019

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Toledo
  • Basıldığı Ülke: Filipinler
  • Atatürk Üniversitesi Adresli: Evet

Özet

Solid electrolytes are considered to be utilized in next generation lithium-ion battery systems. Compared to conventional lithium-ion batteries, these systems enables cells with higher energy density along with free of flammability risks. Among various kind of solid-electrolytes, sulfur based electrolytes are promising to be adopted into lithium-ion batteries by virtue of their high ionic conductivity on the order of liquid electrolytes.

 

Sulfur is at the focus of lithium-sulfur batteries with its theoretical capacity of 1672 mAh/gr. Yet challenges arising from the insulating nature of sulfur and well-known polysulfide shuttle problem hindered its adoption into batteries capable of long cycling. However, studies showed that cell chemistry of solid-state lithium-sulfur batteries are different from conventional cells utilizing liquid organic electrolytes which eliminates the formation of polysulfides.

 

In this study, we constructed all solid-state lithium-ion battery (ASSLIB) where lithium and Li7P3S11 utilized as anode and solid electrolyte respectively. We first checked the compatibility of anode-electrolyte interface through chronoamperometry and chronopotentiometry techniques. Then, sulfur based quaternary composite cathodes were synthesized through three distinct chemistries namely, melt-quenching method, sulfur-amine chemistry and sulfur-reduction from Na2S2O3. Electrochemical performance of different cathode chemistries were compared. Our results indicate that ASSLIBs assembled with cathode utilizing Na2S2O3 reduced sulfur showed best electrochemical performance and cycling. We have proposed the underlying mechanism as the smaller and uniform sulfur distribution enabled by reduction chemistry which facilitates better charge transfer at the cathode. We have also argued the performance limits and bottlenecks of  batteries constructed with liquid and solid electrolytes having same cathode chemistries.