法拉第效率
阳极
电解质
阴极
锂(药物)
金属锂
分解
离子
金属
碳酸盐
化学工程
化学
材料科学
无机化学
电极
物理化学
有机化学
工程类
内分泌学
医学
作者
Minglei Mao,Xiao Ji,Qiyu Wang,Zejing Lin,Meiying Li,Tao Liu,Chengliang Wang,Yong‐Sheng Hu,Hong Li,Xuejie Huang,Liquan Chen,Liumin Suo
标识
DOI:10.1038/s41467-023-36853-x
摘要
Aggressive chemistry involving Li metal anode (LMA) and high-voltage LiNi0.8Mn0.1Co0.1O2 (NCM811) cathode is deemed as a pragmatic approach to pursue the desperate 400 Wh kg-1. Yet, their implementation is plagued by low Coulombic efficiency and inferior cycling stability. Herein, we propose an optimally fluorinated linear carboxylic ester (ethyl 3,3,3-trifluoropropanoate, FEP) paired with weakly solvating fluoroethylene carbonate and dissociated lithium salts (LiBF4 and LiDFOB) to prepare a weakly solvating and dissociated electrolyte. An anion-enrichment interface prompts more anions' decomposition in the inner Helmholtz plane and higher reduction potential of anions. Consequently, the anion-derived interface chemistry contributes to the compact and columnar-structure Li deposits with a high CE of 98.7% and stable cycling of 4.6 V NCM811 and LiCoO2 cathode. Accordingly, industrial anode-free pouch cells under harsh testing conditions deliver a high energy of 442.5 Wh kg-1 with 80% capacity retention after 100 cycles.
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