Tanibata Naoto, Morimoto Riku, Nishikawa Kei, Takeda Hayami, Nakayama Masanobu
Department of Advanced Ceramics, Nagoya Institute of Technology, Gokiso, Showa, Nagoya, Aichi 466-8555, Japan.
Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo, Kyoto 615-8245, Japan.
Anal Chem. 2020 Mar 3;92(5):3499-3502. doi: 10.1021/acs.analchem.9b05321. Epub 2020 Feb 11.
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.
锂金属电极作为高能量存储系统用于锂离子电池是最终选择。其实际应用的一个障碍是锂枝晶的形成。在本研究中，研究了与抑制锂枝晶形成密切相关的锂金属电极的去溶剂化抗性。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，揭示了锂金属电极去溶剂化/溶剂化电阻的不对称性。去溶剂化电阻据推测需要大量源自锂离子与溶剂之间强相互作用的能量，却比溶剂化电阻小。还发现去溶剂化过程中较大的电阻对进一步抑制锂枝晶形成有效。
