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Switching Electrolyte Interfacial Model to Engineer Solid Electrolyte Interface for Fast Charging and Wide‐Temperature Lithium‐Ion Batteries
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Switching Electrolyte Interfacial Model to Engineer Solid Electrolyte Interface for Fast Charging and Wide‐Temperature Lithium‐Ion Batteries
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Switching Electrolyte Interfacial Model to Engineer Solid Electrolyte Interface for Fast Charging and Wide‐Temperature Lithium‐Ion Batteries
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Journal Article
Switching Electrolyte Interfacial Model to Engineer Solid Electrolyte Interface for Fast Charging and Wide‐Temperature Lithium‐Ion Batteries
2022
Overview
Engineering the solid electrolyte interphase (SEI) that forms on the electrode is crucial for achieving high performance in metal‐ion batteries. However, the mechanism of SEI formation resulting from electrolyte decomposition is not fully understood at the molecular scale. Herein, a new strategy of switching electrolyte to tune SEI properties is presented, by which a unique and thinner SEI can be pre‐formed on the graphite electrode first in an ether‐based electrolyte, and then the as‐designed graphite electrode can demonstrate extremely high‐rate capabilities in a carbonate‐based electrolyte, enabling the design of fast‐charging and wide‐temperature lithium‐ion batteries (e.g., graphite | LiNi0.6Co0.2Mn0.2O2 (NCM622)). A molecular interfacial model involving the conformations and electrochemical stabilities of the Li+‐solvent‐anion complex is presented to elucidate the differences in SEI formation between ether‐based and carbonate‐based electrolytes, then interpreting the reason for the obtained higher rate performances. This innovative concept combines the advantages of different electrolytes into one battery system. It is believed that the switching strategy and understanding of the SEI formation mechanism opens a new avenue to design SEI, which is universal for pursuing more versatile battery systems with greater stability. A new concept of switching electrolyte interfacial model is presented to tune the solid electrolyte interphase (SEI) properties, by which a specific thinner SEI is pre‐formed on graphite electrode in ether‐based electrolyte first and then such SEI coated electrode (i.e., graphite@SEI) can be applied in the commercial carbonate‐based electrolyte to achieve a fast‐charging and wide‐temperature lithium‐ion battery.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
