Anion Storage Behavior of Graphite Electrodes in LiBF4/Sulfone/Ethyl Methyl Carbonate Solutions

Yunju Wang; Jiayu Li; Yuhao Huang; Hongyu Wang

doi:10.1021/acs.langmuir.9b02758

Anion Storage Behavior of Graphite Electrodes in LiBF₄/Sulfone/Ethyl Methyl Carbonate Solutions

Langmuir. 2019 Nov 19;35(46):14804-14811. doi: 10.1021/acs.langmuir.9b02758. Epub 2019 Nov 11.

Authors

Yunju Wang^{1

2}, Jiayu Li^{1

2}, Yuhao Huang^{1

2}, Hongyu Wang^{1

2}

Affiliations

¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun 130022 , Jilin , China.
² School of Applied Chemistry and Engineering , University of Science and Technology of China , Hefei 230026 , Anhui , China.

PMID: 31660747
DOI: 10.1021/acs.langmuir.9b02758

Abstract

The electrolyte solutions of 1 M LiBF₄ dissolved in ethyl methyl carbonate (EMC)/sulfone mixtures are applied for dual-ion batteries using graphite positive electrodes. The representative sulfone solvents include sulfolane (SL) and 3-methylsulfolane. Graphite electrodes can deliver higher capacity of anion storage in the solutions of the mixed solvents than those of pure solvents. Traditional electrochemical and in situ X-ray diffraction measurements are performed on Li/graphite cells to probe the anion intercalation process at the interface between graphite electrode and electrolyte solutions. Ionic conductivity, viscosity, and NMR tests are carried out to characterize electrolyte solutions. The effects of ion-pairing between Li⁺ and BF₄^- and the anion solvations by EMC or sulfones on the anion storage in graphite have been addressed.