Dendrite‐Free and Performance‐Enhanced Lithium Metal Batteries through Optimizing Solvent Compositions and Adding Combinational Additives,Advanced Energy Materials

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Dendrite‐Free and Performance‐Enhanced Lithium Metal Batteries through Optimizing Solvent Compositions and Adding Combinational Additives
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-02-12 , DOI: 10.1002/aenm.201703022
Xing Li _{1,

2} , Jianming Zheng ₁ , Xiaodi Ren ₁ , Mark H. Engelhard ₃ , Wengao Zhao _{1,

4} , Qiuyan Li ₁ , Ji-Guang Zhang ₁ , Wu Xu ₁

Affiliation

The instability of lithium (Li) metal anodes due to dendritic growth and low Coulombic efficiency (CE) hinders the practical application of high‐energy‐density Li metal batteries. Here, the systematic studies of improving the stability of Li metal anodes and the electrochemical performance of Li metal batteries through the addition of combinational additives and the optimization of solvent compositions in dual‐salt/carbonate electrolytes are reported. A dendrite‐free and high CE of 98.1% for Li metal anode is achieved. The well‐protected Li metal anode and the excellent cyclability and rate capability of the 4‐V Li metal batteries are obtained. This is attributed to the formation of a robust, denser, more polymeric, and higher ionic conductive surface film on the Li metal anode via the electrochemical reductive decompositions of the electrolyte components and the ring‐opening polymerization of additives and cyclic carbonate solvents. The key findings of this work indicate that the optimization of solvent compositions and the manipulation of additives are facile and effective ways to enhance the performances of Li metal batteries.

中文翻译：

通过优化溶剂成分和添加组合添加剂，实现无树突和性能增强的锂金属电池

树枝状晶体生长和低库仑效率（CE）导致锂（Li）金属阳极的不稳定性阻碍了高能量密度锂金属电池的实际应用。在此，系统地研究了通过添加组合添加剂来改善锂金属阳极的稳定性和锂金属电池的电化学性能，并优化了双盐/碳酸盐电解质中溶剂组成的方法。锂金属阳极的无枝晶和高CE达到98.1％。获得了保护良好的锂金属阳极以及4V锂金属电池优异的循环能力和倍率性能。这归因于形成了坚固，致密，更具聚合性的材料，通过电解质成分的电化学还原分解以及添加剂和环状碳酸酯溶剂的开环聚合，在锂金属阳极上形成较高的离子导电表面膜。这项工作的主要发现表明，溶剂成分的优化和添加剂的操作是提高锂金属电池性能的便捷有效途径。

更新日期：2018-02-12

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