Chelating Ligands as Electrolyte Solvent for Rechargeable Zinc-Ion Batteries
- Vivek VermaVivek VermaSchool of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by Vivek Verma,
- R. Moesha ChanR. Moesha ChanSchool of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by R. Moesha Chan,
- Li Jia YangLi Jia YangSchool of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by Li Jia Yang,
- Sonal KumarSonal KumarSchool of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by Sonal Kumar,
- Suchinda SattayapornSuchinda SattayapornSynchrotron Light Research Institute (Public Organization), Muang, Nakhon Ratchasima, 30000, ThailandMore by Suchinda Sattayaporn,
- Rodney ChuaRodney ChuaSchool of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by Rodney Chua,
- Yi CaiYi CaiSchool of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by Yi Cai,
- Pinit KidkhunthodPinit KidkhunthodSynchrotron Light Research Institute (Public Organization), Muang, Nakhon Ratchasima, 30000, ThailandMore by Pinit Kidkhunthod,
- William Manalastas Jr.William Manalastas, Jr.School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977More by William Manalastas, Jr., and
- Madhavi Srinivasan*Madhavi Srinivasan*Email: [email protected]School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Avenue, Singapore 639977Energy Research Institute @ NTU ([email protected]), Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, Singapore 637553, SingaporeMore by Madhavi Srinivasan
Abstract
Rechargeable zinc-ion batteries (RZIBs) are mostly powered by aqueous electrolytes. However, uncontrolled water interactions often confer a small voltage window and poor battery capacity retention. Here, we explore replacing water with ethylene glycol as the primary solvent in zinc electrolyte formulations. The assembled batteries reveal suppressed electrolyte-induced parasitic reactions, leading to (1) expanded voltage stability windows up to 2.2 V, (2) prolonged zinc stripping/plating stability up to 2.4 times longer compared to the water-based counterparts, and (3) doubled cathode capacity retentions as observed in full-cell Zn-FeVO4 RZIBs. Using a combination of synchrotron EXAFS and FTIR, we investigate the molecular level salt-solvent interactions and explain how the chelation ability of EG ligands reduces parasitic reactions to enable the enhanced electrochemical performances. The structural insights should provide guidelines on the selection of salt, concentration, and chelating solvents for robust multivalent-ion battery systems.
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