Enabling High‐Voltage Lithium Metal Batteries by Manipulating Solvation Structure in Ester Electrolyte. Issue 9 (21st January 2020)

• Record Type: Journal Article
• Authors: Jie, Yulin; Liu, Xiaojing; Lei, Zhanwu; Wang, Shiyang; Chen, Yawei; Huang, Fanyang; Cao, Ruiguo; Zhang, Genqiang; Jiao, Shuhong
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 9(2020)
• Page Start: 3505
• Page End: 3510
• Publication Date: 2020-01-21
• Subjects: electrode materials -- high voltage -- lithium metal batteries -- lithium solvate sheath; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201914250
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Lithium metal is an ideal electrode material for future rechargeable lithium metal batteries. However, the widespread deployment of metallic lithium anode is significantly hindered by its dendritic growth and low Coulombic efficiency, especially in ester solvents. Herein, by rationally manipulating the electrolyte solvation structure with a high donor number solvent, enhancement of the solubility of lithium nitrate in an ester‐based electrolyte is successfully demonstrated, which enables high‐voltage lithium metal batteries. Remarkably, the electrolyte with a high concentration of LiNO3 additive presents an excellent Coulombic efficiency up to 98.8 % during stable galvanostatic lithium plating/stripping cycles. A full‐cell lithium metal battery with a lithium nickel manganese cobalt oxide cathode exhibits a stable cycling performance showing limited capacity decay. This approach provides an effective electrolyte manipulation strategy to develop high‐voltage lithium metal batteries. Abstract : The dissolution of LiNO3 in ester‐based electrolyte is realized by the use of γ‐butyrolactone (GBL) as the co‐solvent. NO3 − exists in the electrolyte in the form of a contact‐ion pair (CIP), which manipulates the solid–electrolyte interphase layer on the lithium metal anode and promotes the stability of the lithium metal anode.