Insight into the Role of Fluoroethylene Carbonate on the Stability of Sb||Graphite Dual-Ion Batteries in Propylene Carbonate-Based Electrolyte

Zhuo Yang; Xun-Zhu Zhou; Zhi-Qiang Hao; Jian Chen; Lin Li; Qing Zhao; Wei-Hong Lai; Shu-Lei Chou

doi:10.1002/anie.202313142

Insight into the Role of Fluoroethylene Carbonate on the Stability of Sb||Graphite Dual-Ion Batteries in Propylene Carbonate-Based Electrolyte

Angew Chem Int Ed Engl. 2024 Jan 15;63(3):e202313142. doi: 10.1002/anie.202313142. Epub 2023 Dec 7.

Authors

Zhuo Yang^{1

2}, Xun-Zhu Zhou^{1

2}, Zhi-Qiang Hao^{1

2}, Jian Chen^{1

2}, Lin Li^{1

2}, Qing Zhao³, Wei-Hong Lai⁴, Shu-Lei Chou^{1

2}

Affiliations

¹ Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, People's Republic of China.
² Wenzhou Key Laboratory of Sodium-Ion Batteries, Wenzhou University Technology Innovation Institute for Carbon Neutralization, Wenzhou, Zhejiang 325035, People's Republic of China.
³ Frontiers Science Center for New Organic Matter, Renewable Energy Conversion and Storage Center (RECAST), Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
⁴ Institute for Superconducting and Electronic Materials, University of Wollongong, Innovation Campus, Squires Way, Wollongong, New South Wales, 2500, (Australia).

PMID: 37917045
DOI: 10.1002/anie.202313142

Abstract

Sodium dual-ion batteries (Na-DIBs) have attracted increasing attention due to their high operative voltages and low-cost raw materials. However, the practical applications of Na-DIBs are still hindered by the issues, such as low capacity and poor Coulombic efficiency, which is highly correlated with the compatibility between electrode and electrolyte but rarely investigated. Herein, fluoroethylene carbonate (FEC) is introduced into the electrolyte to regulate cation/anion solvation structure and the stability of cathode/anode-electrolyte interphase of Na-DIBs. The FEC modulates the environment of PF₆ ^- solvation sheath and facilitates the interaction of PF₆ ^- on graphite. In addition, the NaF-rich interphase caused by the preferential decomposition of FEC effectively inhibits side reactions and pulverization of anodes with the electrolyte. Consequently, Sb||graphite full cells in FEC-containing electrolyte achieve an improved capacity, cycling stability and Coulombic efficiency. This work elucidates the underlying mechanism of bifunctional FEC and provides an alternative strategy of building high-performance dual ion batteries.

Keywords: Antimony Anode; Dual-Ion Batteries; Fluoroethylene Carbonate; Graphite Cathode; Solvation Structure.

Abstract

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