锂(药物)
电解质
硼
电化学
盐(化学)
硼酸锂
热稳定性
阴极
无机化学
化学工程
化学
材料科学
有机化学
硼酸盐玻璃
阳极
电极
医学
内分泌学
物理化学
工程类
作者
Guansheng Chen,Lixin Qiao,Gaojie Xu,Longshan Li,Jiedong Li,Lin Li,Xiaochen Liu,Zili Cui,Shenghang Zhang,Shaokai Cheng,Changxing Han,Shitao Wang,Xinhong Zhou,Guanglei Cui
标识
DOI:10.1002/anie.202400797
摘要
Abstract Traditional lithium salts are difficult to meet practical application demand of lithium metal batteries (LMBs) under high voltages and temperatures. LiPF 6 , as the most commonly used lithium salt, still suffers from notorious moisture sensitivity and inferior thermal stability under those conditions. Here, we synthesize a lithium salt of lithium perfluoropinacolatoborate (LiFPB) comprising highly‐fluorinated and borate functional groups to address the above issues. It is demonstrated that the LiFPB shows superior thermal and electrochemical stability without any HF generation under high temperatures and voltages. In addition, the LiFPB can form a protective outer‐organic and inner‐inorganic rich cathode electrolyte interphase on LiCoO 2 (LCO) surface. Simultaneously, the FPB − anions tend to integrate into lithium ion solvation structure to form a favorable fast‐ion conductive LiB x O y based solid electrolyte interphase on lithium (Li) anode. All these fantastic features of LiFPB endow LCO (1.9 mAh cm −2 )/Li metal cells excellent cycling under both high voltages and temperatures (e.g., 80 % capacity retention after 260 cycles at 60 °C and 4.45 V), and even at an extremely elevated temperature of 100 °C. This work emphasizes the important role of salt anions in determining the electrochemical performance of LMBs at both high temperature and voltage conditions.
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