材料科学
电化学
电解质
阳极
枝晶(数学)
锂(药物)
沉积(地质)
电镀
电化学窗口
电池(电)
化学工程
动力学
纳米技术
无机化学
电极
物理化学
离子电导率
热力学
化学
图层(电子)
功率(物理)
物理
古生物学
内分泌学
工程类
几何学
生物
医学
量子力学
数学
沉积物
作者
Qing Lan,Yutao Liu,Jian Qin,Yuchao Zhao,Hui Zhan
标识
DOI:10.1021/acsami.1c01476
摘要
The lithium-secondary battery is considered to be the most prospective electrochemical energy storage in the upcoming decades. However, its real application still much depends on the effective strategy toward Li dendrite growth. After years of effort, many successful works have been reported on improving the solid–electrolyte interphase (SEI), either via electrolyte optimization or building artificial SEI while intrinsically adjusting the electrochemical reduction of Li+ has been rarely mentioned. Inspired by the successful works in the electroplating industry, in this paper, a Li-chelating agent, benzo-15-crown-5 (B15C5) was used to regulate Li-reduction kinetics from an electrochemical view. Owing to the coordination with Li+, Li+ + complex + e– → Li[complex] is generated and proved by a decreased i0 value. B15C5 confined within the PVC matrix has been coated on a Li anode. With thus-obtained B15C5-PVC-Li, dendrite growth has been significantly reduced and prolonged cycling has been observed in Li|Li symmetric cells. Electrochemically modulated Li deposition has been further accessed by the full cell of LiFePO4|Li, and 163 mA h/g capacity is stably released after 400 cycles at 1.0 mA/cm2. This study provides an alternate approach to address the dendrite growth issue and sheds more light on the Li-deposition kinetics.
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