Efficient and stable cycling of lithium metal enabled by a conductive carbon primer layer†,Sustainable Energy & Fuels

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Efficient and stable cycling of lithium metal enabled by a conductive carbon primer layer†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1039/c7se00391a
Sheng S. Zhang _{1,

2,

3,

4,

5} , Xiulin Fan _{6,

7,

8,

9} , Chunsheng Wang _{6,

7,

8,

9}

Affiliation

Two requirements must be met for efficient and stable cycling of Li metal: (1) intimate and uniform nucleation of Li metal on an electrode substrate for constant current distribution throughout the electrode surface and (2) chemical and electrochemical stability of electrolyte components for high coulombic efficiency. With a focus on the electrode substrate, in this work, we coat a very thin and highly conductive carbon layer as the Li plating primer onto the surface of an existing Cu substrate. It is shown that the carbon primer layer greatly increases coulombic efficiency and cycling stability of Li metal. Microstructural characterization and ac-impedance analysis reveal that the improvement is due to the preferential nucleation of Li metal on the surface of carbon granules, which results in low contact resistance between the plated Li and the electrode substrate. The results of this work indicate that applying a conductive carbon primer layer is a simple and cost-effective approach for the efficient and stable cycling of Li metal.

中文翻译：

导电碳底漆层使锂金属有效而稳定地循环†

有效且稳定地循环锂金属必须满足两个要求：（1）锂金属在电极基材上均匀且均匀地成核，以确保整个电极表面上的电流恒定分布；（2）高库仑电解液组分的化学和电化学稳定性效率。着眼于电极基板，在这项工作中，我们将非常薄且高度导电的碳层作为Li镀底漆涂覆到了现有Cu基板的表面上。结果表明，碳底漆层大大提高了锂金属的库仑效率和循环稳定性。微观结构表征和交流阻抗分析表明，这种改进是由于锂金属在碳粒表面上的优先成核所致，这导致镀Li和电极基板之间的接触电阻低。这项工作的结果表明，施加导电碳底漆层是一种简单且经济高效的方法，可实现锂金属的有效且稳定的循环。

更新日期：2017-09-18

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