Anion Storage Behavior of Graphite Electrodes in LiBF<sub>4</sub>/Sulfone/Ethyl Methyl Carbonate Solutions

Published on 2019-11-08T22:30:03Z (GMT) by
The electrolyte solutions of 1 M LiBF<sub>4</sub> 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<sup>+</sup> and BF<sub>4</sub><sup>–</sup> and the anion solvations by EMC or sulfones on the anion storage in graphite have been addressed.

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Wang, Yunju; Li, Jiayu; Huang, Yuhao; Wang, Hongyu (2019): Anion Storage Behavior of Graphite Electrodes in LiBF4/Sulfone/Ethyl Methyl Carbonate Solutions. ACS Publications. Collection.