Jun Seo-Young, Shin Kihyun, Lee Jun-Seo, Kim Suji, Chun Jinyoung, Ryu Won-Hee
Dept. of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea.
Dept. of Materials Science and Engineering, Hanbat National University, Daejeon, 34158, Republic of Korea.
Adv Sci (Weinh). 2023 Aug;10(23):e2301426. doi: 10.1002/advs.202301426. Epub 2023 May 23.
Reaching the border of the capable energy limit in existing battery technology has turned research attention away from the rebirth of unstable Li-metal anode chemistry in order to achieve exceptional performance. Strict regulation of the dendritic Li surface reaction, which results in a short circuit and safety issues, should be achieved to realize Li-metal batteries. Herein, this study reports a surface-flattening and interface product stabilizing agent employing methyl pyrrolidone (MP) molecular dipoles in the electrolyte for cyclable Li-metal batteries. The excellent stability of the Li-metal electrode over 600 cycles at a high current density of 5 mA cm has been demonstrated using an optimal concentration of the MP additive. This study has identified the flattening surface reconstruction and crystal rearrangement behavior along the stable (110) plane assisted by the MP molecular dipoles. The stabilization of the Li-metal anodes using molecular dipole agents has helped develop next-generation energy storage devices using Li-metal anodes, such as Li-air, Li-S, and semi-solid-state batteries.
现有电池技术已达到能量极限的边界，这使得研究重点不再是不稳定的锂金属负极化学的复兴，而是转向实现卓越性能。为了实现锂金属电池，必须严格控制导致短路和安全问题的锂枝晶表面反应。在此，本研究报告了一种用于可循环锂金属电池的表面平整和界面产物稳定剂，该稳定剂在电解质中采用N-甲基吡咯烷酮（MP）分子偶极。使用最佳浓度的MP添加剂，已证明锂金属电极在5 mA cm²的高电流密度下可循环600次以上，具有出色的稳定性。本研究确定了在MP分子偶极辅助下，沿稳定的（110）平面的表面平整重建和晶体重排行为。使用分子偶极剂稳定锂金属负极有助于开发使用锂金属负极的下一代储能装置，如锂空气电池、锂硫电池和半固态电池。
