Difluoro(oxalato)borate's Role in the Intercalation Behavior of Mixed Anions from Sulfolane

Yunju Wang; Shunchao Ma; Hongyu Wang

doi:10.1002/cssc.202201218

Difluoro(oxalato)borate's Role in the Intercalation Behavior of Mixed Anions from Sulfolane

ChemSusChem. 2023 Feb 20;16(4):e202201218. doi: 10.1002/cssc.202201218. Epub 2022 Sep 15.

Authors

Yunju Wang^{1

2}, Shunchao Ma¹, Hongyu Wang^{1

2}

Affiliations

¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, 5625 Renmin street, Changchun, 130022, P. R. China.
² School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, P. R. China.

PMID: 36039804
DOI: 10.1002/cssc.202201218

Abstract

Some previous studies have found the synergistic effect of mixed anions in dual-ion batteries (DIBs). In this work, both lithium tetrafluoroborate (LiBF₄ ) and lithium difluoro(oxalato)borate (LiDFOB) were dissolved in sulfolane (SL) solvent, and the resultant solutions were applied for DIBs. The storage behavior of mixed anions in natural graphite positive electrodes was investigated. In-situ X-ray diffraction measurements revealed both anions could participate in the formation of graphite intercalation compounds. Their evolution followed with the decreasing tendency of discharge capacities as the content of LiDFOB increased in solutions. The exchange of anions was discussed.

Keywords: dual-ion battery; electrode materials; energy storage; mixed salts; sulfolane.

Grants and funding

21975251/National Natural Science Foundation of China