期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-33151-w
关键词
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资金
- National Natural Science Foundation of China [22072134, 22161142017, U21A2081]
- Natural Science Foundation of Zhejiang Province [LZ21B030002]
- Fundamental Research Funds for the Zhejiang Provincial Universities [2021XZZX010]
- Fundamental Research Funds for the Central Universities [2021FZZX001-09]
- Hundred Talents Program of Zhejiang University
The authors establish a mechanistic model to analyze the effect of solid electrolyte interphase (SEI) on realistic lithium plating in high-fluorine electrolytes. By designing an efficient electrolyte to generate a homogenous dual-halide SEI, the Coulombic efficiency of lithium metal batteries can be improved.
The low conductivity of LiF disturbs Li+ diffusion across solid electrolyte interphase (SEI) and induces Li+ transfer-driven dendritic growth. Herein, the authors establish a mechanistic model to decipher how the SEI affects realistic Li plating in high-fluorine electrolytes. Electrolyte engineering advances Li metal batteries (LMBs) with high Coulombic efficiency (CE) by constructing LiF-rich solid electrolyte interphase (SEI). However, the low conductivity of LiF disturbs Li+ diffusion across SEI, thus inducing Li+ transfer-driven dendritic deposition. In this work, we establish a mechanistic model to decipher how the SEI affects Li plating in high-fluorine electrolytes. The presented theory depicts a linear correlation between the capacity loss and current density to identify the slope k (determined by Li+ mobility of SEI components) as an indicator for describing the homogeneity of Li+ flux across SEI, while the intercept dictates the maximum CE that electrolytes can achieve. This model inspires the design of an efficient electrolyte that generates dual-halide SEI to homogenize Li+ distribution and Li deposition. The model-driven protocol offers a promising energetic analysis to evaluate the compatibility of electrolytes to Li anode, thus guiding the design of promising electrolytes for LMBs.
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