Accurate Determination of Coulombic Efficiency for Lithium Metal Anodes and Lithium Metal Batteries,Advanced Energy Materials

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Accurate Determination of Coulombic Efficiency for Lithium Metal Anodes and Lithium Metal Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-10-11 , DOI: 10.1002/aenm.201702097
Brian D. Adams _{1,

2} , Jianming Zheng ₂ , Xiaodi Ren ₂ , Wu Xu ₂ , Ji-Guang Zhang _{1,

2}

Affiliation

Lithium (Li) metal is an ideal anode material for high energy density batteries. However, the low Coulombic efficiency (CE) and the formation of dendrites during repeated plating and stripping processes have hindered its applications in rechargeable Li metal batteries. The accurate measurement of Li CE is a critical factor to predict the cycle life of Li metal batteries, but the measurement of Li CE is affected by various factors that often lead to conflicting values reported in the literature. Here, several parameters that affect the measurement of Li CE are investigated and a more accurate method of determining Li CE is proposed. It is also found that the capacity used for cycling greatly affects the stabilization cycles and the average CE. A higher cycling capacity leads to faster stabilization of Li anode and a higher average CE. With a proper operating protocol, the average Li CE can be increased from 99.0% to 99.5% at a high capacity of 6 mA h cm⁻² (which is suitable for practical applications) when a high‐concentration ether‐based electrolyte is used.

中文翻译：

锂金属阳极和锂金属电池库仑效率的准确测定

锂（Li）金属是高能量密度电池的理想负极材料。然而，低库仑效率（CE）以及在反复的电镀和剥离过程中形成树枝状晶体阻碍了其在可充电锂金属电池中的应用。Li CE的准确测量是预测Li金属电池循环寿命的关键因素，但是Li CE的测量受各种因素的影响，这些因素通常会导致文献中报道的数值发生冲突。在此，研究了影响Li CE测量的几个参数，并提出了一种更准确的Li CE测定方法。还发现用于循环的容量极大地影响稳定周期和平均CE。更高的循环容量导致锂阳极的更快稳定化和更高的平均CE。当使用高浓度醚基电解质时，⁻²（适用于实际应用）。

更新日期：2017-10-11

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