Study on LiI and KI with low melting temperature for electrolyte replenishment in molten carbonate fuel cells

Jae Kwan Bae, Hyun Woo Kim, Grazia Accardo, Ghun Sik Kim, Hyung Chul Ham, Seong Cheol Jang, Yong Soo Cho, Sung Pil Yoon

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Molten carbonate fuel cells (MCFCs) are regarded as the closest fuel cell to commercialization due to their high capacity and energy efficiency. However, they are operated at a high temperature (620 °C or higher), where liquid electrolyte loss occurs during operation; hence, their lifetime is limited. For the long-term operation of MCFCs, it is essential to develop a novel method to replenish the electrolyte during operation. However, it is very difficult to directly inject the electrolyte, (Li0.62K0.38)2CO3, into each unit cell of the stack unless it is supplemented through liquid or gas phase at low temperature. It was verified whether LiI and KI, which have low melting points and high vapor pressures, could replenish the lost electrolyte in MCFCs. In this study, the LiI and KI injected into the unit cell in liquid phase showed a similar tendency to the Li/K carbonate electrolyte. This is because LiI and KI react with the CO2/O2 gases supplied to the cathode during MCFC operation to form Li/K carbonate electrolytes.

Original languageEnglish
Pages (from-to)25930-25938
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number47
Publication statusPublished - 2019 Oct 4

Bibliographical note

Funding Information:
This work was financially supported by the Energy Technology Program of Korea Institute of Energy Technology Evaluation and Planning (KETEP) ( 20163030031860 ) and the Ministry of Trade, Industry & Energy (MOTIE) of Korea and the Creative Materials Discovery Program by Ministry of Science and ICT ( 2018M3D1A1058536 ) and the KIST institutional program for the Korea Institute of Science and Technology ( 2E29610 ).

Publisher Copyright:
© 2019 Hydrogen Energy Publications LLC

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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