阳极
法拉第效率
材料科学
电解质
锂(药物)
溶解
阴极
化学工程
金属
枝晶(数学)
盐(化学)
电极
电化学
化学
有机化学
冶金
工程类
内分泌学
物理化学
医学
数学
几何学
作者
Huijing Yang,Qingyun Liu,Yaozu Wang,Zhuoting Ma,Pei Tang,Xiaoyin Zhang,Hui‐Ming Cheng,Ze Sun,Feng Li
出处
期刊:Small
[Wiley]
日期:2022-05-26
卷期号:18 (25)
被引量:14
标识
DOI:10.1002/smll.202202349
摘要
Lithium metal is an ideal electrode material for future rechargeable batteries. However, dendrite formation and unstable solid electrolyte interphase film lead to safety concerns and poor Coulombic efficiency (CE). LiNO3 significantly improves the performance of the lithium metal anode in ester electrolytes but its use is restricted by low solubility. To increase the content of LiNO3 in the cell, a poly-(vinyl carbonate) organogel interlayer containing dissociated LiNO3 (LNO-PVC) is placed between the cathode and anode. The dissociated LiNO3 effectively increases the LiNO3 -release rate and compensates for the LiNO3 consumed in ester electrolytes during cycling. Via this interlayer, the performance of the lithium metal anode is significantly improved. The average CE of a Li-Cu cell reaches 98.6% at 0.5 mA cm-2 -1 h and 98.5% at 1 mA cm-2 -1 h for 300 cycles. Also, a Li||NCM811 pouch cell with LNO-PVC interlayer can also reach a 400 Wh kg-1 energy density with a cycling life of 65 cycles. This strategy sheds light on the effect of the state of this salt on its release/dissolution kinetics, which is determined by the interactions between the salt and host material.
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