浙江大学陆俊团队开发了用于高压锂金属电池的低浓度环丁砜基电解质。相关研究成果于2023年1月14日发表于国际一流学术期刊《德国应用化学》。

电解质工程对锂金属电池的商业化至关重要。

该文中，锂金属首次在低浓度（0.25M）下稳定在高活性环丁砜基电解质中。无机聚合物混合SEI具有高离子导电性、与锂的低键合性和高柔性，可实现致密块状锂沉积和高电镀/剥离效率。LCE还使NCM523/Li电池在1℃（500次循环后保持率为90.7%）和0.3℃（1000次循环后保留率为83.3%）下具有优异的循环稳定性。在低N/P比（~2）的情况下，NCM523/Li电池在0.3℃下进行100次循环后的容量保持率可达到94.3%。LCE的探索具有极其重要的意义，因为它为锂盐的选择提供了更多的可能性，特别是使一些因其低溶解度而被排除在外的锂盐重新焕发活力。更重要的是，由于成本效益，LCE具有显著的商业化优势。

附：英文原文

Title: Low Concentration Sulfolane-based Electrolyte for High Voltage Lithium Metal Batteries

Author: Pengcheng Li, Hao Zhang, Jun Lu, Ge Li

Issue&Volume: 2023-01-14

Abstract: Electrolyte engineering is crucial for the commercialization of lithium metal batteries. Here, lithium metal is stabilized in highly reactive sulfolane-based electrolyte under low concentration (0.25 M) for the first time. Inorganic-polymer hybrid SEI with high ionic conductivity, low bonding with lithium and high flexibility enables dense chunky lithium deposition and high plating/stripping efficiency. LCE also enables excellent cycling stability of NCM523/Li cells at 1 C (90.7% retention after 500 cycles) and 0.3 C (83.3% retention after 1000 cycles). With a low N/P ratio (~2), the capacity retention for NCM523/Li cells can achieve 94.3% after 100 cycles at 0.3 C. The exploring of the LCE is of paramount significance because it provides more possibilities of the lithium salts selection, especially reviving some lithium salts that are excluded before due to their low solubility. More importantly, LCE has the significant advantage of commercialization due to the cost effectiveness.

DOI: 10.1002/anie.202216312

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202216312