caa a22 4500 475816447 CHVBK 20180406123811.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1026539607417 doi (NATIONALLICENCE)springer-10.1023/A:1026539607417 Effect of sodium iodide additive on the electrochemical performance of sodium/nickel chloride cells [Elektronische Daten] [Jai Prakash, Laszlo Redey, Donald Vissers, James DeGruson] The effect of sodium iodide and sulfur additives on the performance of Na/β′′-alumina/NaAlCl4/NiCl2/Ni cells was investigated in quasi-sealed laboratory research cells (0.5-1.0 Ah capacity) and in sealed full-size cells (4 Ah capacity). It was found that sodium iodide additive especially in combination with sulfur in Na/NiCl2 cells significantly increases the usable capacity and reduces the impedance of the Na/NiCl2 cells. It is proposed that the use of sodium iodide enhances the energy and power performance of the NiCl2 electrode by two different mechanisms. The first mechanism, iodide ion doping of the anodically formed solid NiCl2, is dominant at potentials lower than that of iodine evolution. The doping effect of the iodide ions produces a higher-capacity, lower-impedance NiCl2 layer on the positive electrode. The second mechanism, anodic formation of very reactive iodine species, is effective when the cell is cycled through the iodine evolution potential range (2.8-3.1 V vs Na). During this process, the dissolved iodine species improve electrode kinetics through liquid-phase mass transport. Use of the sodium iodide additive is safe in sealed cells, causing no over-pressurizing problems. A maximum pressure increase of only 10 kPa was detected by a pressure sensor during severe overcharge tests. Kluwer Academic Publishers, 2000 batteries nationallicence dynamic performance nationallicence electric vehicle nationallicence iodine nationallicence nickel chloride nationallicence Prakash Jai Center for Electrochemical Science and Engineering and the Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 60616, Chicago, IL, USA aut Redey Laszlo Center for Electrochemical Science and Engineering and the Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 60616, Chicago, IL, USA aut Vissers Donald Center for Electrochemical Science and Engineering and the Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 60616, Chicago, IL, USA aut DeGruson James Eagle-Picher Industries, Inc., 64801, Joplin, MO, USA aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/11(2000-11-01), 1229-1233 0021-891X 30:11<1229 2000 30 10800 https://doi.org/10.1023/A:1026539607417 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026539607417 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Prakash Jai Center for Electrochemical Science and Engineering and the Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 60616, Chicago, IL, USA aut NATIONALLICENCE 700 1- Redey Laszlo Center for Electrochemical Science and Engineering and the Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 60616, Chicago, IL, USA aut NATIONALLICENCE 700 1- Vissers Donald Center for Electrochemical Science and Engineering and the Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 60616, Chicago, IL, USA aut NATIONALLICENCE 700 1- DeGruson James Eagle-Picher Industries, Inc., 64801, Joplin, MO, USA aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/11(2000-11-01), 1229-1233 0021-891X 30:11<1229 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer