电解质
无定形固体
化学工程
材料科学
硝酸锂
阳极
锂(药物)
化学
纳米技术
离子键合
离子
结晶学
有机化学
物理化学
电极
内分泌学
工程类
医学
作者
Po‐Chun Hsu,Yi Lin,Wei-Hsuan Wu,Chun‐Wei Pao,C. H. Chen
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-12-01
卷期号:169 (12): 120520-120520
被引量:1
标识
DOI:10.1149/1945-7111/acaad2
摘要
Using lithium metal as the anode is a promising way to raise the energy density of batteries, but inevitable lithium dendrite growth hinders the development of this kind of batteries. Albeit great efforts were devoted to uncovering the mystery of the solid electrolyte interphase (SEI), which determines the stability of the plating and stripping of lithium metal, our understanding of SEI at the atomic scale is limited due to its complex structure and composition. This work proposes a computational framework, based on the reactive force field molecular dynamics (ReaxFF), for simulating the SEI formation. Our results suggest the SEI in the standard EC/DEC electrolyte resembles a heterogeneous mosaic structure with inorganic crystalline grains randomly dispersed within the amorphous polymer matrix, as the consequence of the bottom-up growth sequence. When lithium nitrate is present in the electrolyte, the preferential reduction of lithium nitrate effectively regulates the electrolyte decomposition for rendering a bilayer structure with the lithium nitrate reduction products, Li 3 N and LiN x O y , on top of the amorphous polymer matrix. Although these N-containing compounds are good lithium-ion conducting materials for retaining a uniform, fast lithium-ion transport through the SEI, we observe a significant decrease in the mechanical performance due to the high-porosity structure.
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