法拉第效率
涂层
电极
材料科学
电解质
锂(药物)
电池(电)
集电器
电流密度
锂离子电池
复合材料
化学工程
纳米技术
化学
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Guangyuan Zheng,Chao Wang,Allen Pei,Jeffrey Lopez,Feifei Shi,Zheng Chen,Austin D. Sendek,Hyun‐Wook Lee,Zhenda Lu,Holger Schneider,Marina M. Safont‐Sempere,Steven Chu,Zhenan Bao,Yi Cui
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2016-11-21
卷期号:1 (6): 1247-1255
被引量:290
标识
DOI:10.1021/acsenergylett.6b00456
摘要
The future development of low-cost, high-performance electric vehicles depends on the success of next-generation lithium-ion batteries with higher energy density. The lithium metal negative electrode is key to applying these new battery technologies. However, the problems of lithium dendrite growth and low Coulombic efficiency have proven to be difficult challenges to overcome. Fundamentally, these two issues stem from the instability of the solid electrolyte interphase (SEI) layer, which is easily damaged by the large volumetric changes during battery cycling. In this work, we show that when a highly viscoelastic polymer was applied to the lithium metal electrode, the morphology of the lithium deposition became significantly more uniform. At a high current density of 5 mA/cm2 we obtained a flat and dense lithium metal layer, and we observed stable cycling Coulombic efficiency of ∼97% maintained for more than 180 cycles at a current density of 1 mA/cm2.
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