Asymmetry in the Solvation?Desolvation Resistance for Li Metal Batteries
Asymmetry in the Solvation?Desolvation Resistance for Li Metal Batteries
复制标题
锂金属电池溶剂化不对称性及去溶剂化阻力
DOI：
10.1021/acs.analchem.9b05321
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发表时间：
2020
影响因子：
7.4
通讯作者：
Nakayama Masanobu
中科院分区：
文献类型：
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作者：
Tanibata Naoto;Morimoto Riku;Nishikawa Kei;Takeda Hayami;Nakayama Masanobu
锂金属电极是锂离子电池作为高能量存储系统的最终选择。其实际实现的一个障碍是锂枝晶的形成。在这项研究中，研究了锂金属电极的去溶剂化电阻，这与抑制锂枝晶的形成密切相关。通过应用拉普拉斯变换阻抗技术，成功地分离并分析了使用含有不同锂盐的液体电解质的电池中的去溶剂化/溶剂化电阻，揭示了锂金属电极的去溶剂化/溶剂化电阻的不对称性。去溶剂化电阻被认为需要来自锂离子和溶剂之间的强相互作用的大量能量，但其小于溶剂化电阻。研究还表明，去溶剂化过程中较大的阻力对于进一步抑制锂枝晶的形成是有效的。
Li metal electrode is the ultimate choice use in Li ion batteries as high-energy storage systems. An obstacle to its practical realization is Li dendrite formation. In this study, the desolvation resistance of the Li metal electrode, which is strongly related to the inhibition of Li dendrite formation, is investigated. By applying a Laplace transform impedance technique, the desolvation/solvation resistances were successfully separated and analyzed in cells using liquid electrolytes containing different lithium salts, revealing asymmetry in the desolvation/solvation resistances of Li metal electrodes. The desolvation resistances, which supposedly require large amounts of energy derived from the strong interaction between Li+ion and solvents, were smaller than the solvation resistances. It has also been revealed that the larger resistance in the desolvation process is effective for suppressing Li dendrite formation further.