Electrochemical Sodiation and Desodiation of Gallium. Issue 6 (1st June 2022)

• Record Type: Journal Article
• Authors: Le Ruyet, Ronan; Kullgren, Jolla; Naylor, Andrew J.; Younesi, Reza
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 6(2022)
• Publication Date: 2022-06-01
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac766b
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : This study demonstrates the electrochemical sodiation and desodiation of gallium (Ga). A variety of techniques including galvanostatic cycling, cyclic voltammetry, as well as ex situ and in situ powder X-ray diffraction were used to determine the electrochemical reaction mechanisms. The sodiation and desodiation of Ga occurs reversibly at 0.71 V vs Na + /Na and the sodiated product was determined to be NaGa4 with a theoretical capacity of 96 mAh g −1 (567 mAh cm −3 ). In addition, an anomalous plateau was observed at 0.66 V vs Na + /Na during the sodiation, which was attributed to a slow diffusion of Na into Ga particles. It was also shown that Na22 Ga39 was not formed even if it is one of the expected compounds from the Ga-Na phases diagram. However, new crystalline structures were observed and were attributed to metastable phases of NaGa4 .