相间
电解质
锂(药物)
电极
金属
金属锂
溶剂化
材料科学
溶剂
离子
二甲氧基乙烷
无机化学
化学
物理化学
有机化学
内分泌学
冶金
生物
医学
遗传学
作者
Muhammad Mominur Rahman,Sha Tan,Yang Yang,Hui Zhong,Sanjit Ghose,Iradwikanari Waluyo,Adrian Hunt,Lu Ma,Xiao‐Qing Yang,Enyuan Hu
标识
DOI:10.1038/s41467-023-44282-z
摘要
Li metal batteries using Li metal as negative electrode and LiNi1-x-yMnxCoyO2 as positive electrode represent the next generation high-energy batteries. A major challenge facing these batteries is finding electrolytes capable of forming good interphases. Conventionally, electrolyte is fluorinated to generate anion-derived LiF-rich interphases. However, their low ionic conductivities forbid fast-charging. Here, we use CsNO3 as a dual-functional additive to form stable interphases on both electrodes. Such strategy allows the use of 1,2-dimethoxyethane as the single solvent, promising superior ion transport and fast charging. LiNi1-x-yMnxCoyO2 is protected by the nitrate-derived species. On the Li metal side, large Cs+ has weak interactions with the solvent, leading to presence of anions in the solvation sheath and an anion-derived interphase. The interphase is surprisingly dominated by cesium bis(fluorosulfonyl)imide, a component not reported before. Its presence suggests that Cs+ is doing more than just electrostatic shielding as commonly believed. The interphase is free of LiF but still promises high performance as cells with high LiNi0.8Mn0.1Co0.1O2 loading (21 mg/cm2) and low N/P ratio (~2) can be cycled at 2C (~8 mA/cm2) with above 80% capacity retention after 200 cycles. These results suggest the role of LiF and Cs-containing additives need to be revisited.
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