Zhang Kejia, Li Decheng, Shao Jie, Jiang Yu, Lv Linze, Shi Qiang, Qu Qunting, Zheng Honghe
College of Energy, Soochow University Suzhou, Jiangsu, 215006, P. R. China.
College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou, Jiangsu, 215006, P. R. China.
ChemSusChem. 2023 Jul 7;16(13):e202300324. doi: 10.1002/cssc.202300324. Epub 2023 Apr 27.
Dual-ion batteries (DIBs) with graphite as cathode material, show superiority in terms of sustainability, affordability, and environmental impact over Li-ion batteries that rely on transition-metal based cathodes. However, graphite cathodes severely suffer from poor structural stability during anion storage at high potentials because of the co-intercalation and oxidative decomposition of electrolytes. This work presents an in situ electrochemistry-driven route to create a bifunctional interphase through implantation of diethylenetriaminepenta(methylene-phosphonic acid) (DTPMP) on the surface of graphite particles. The reaction mechanisms and functions of DTPMP are investigated both experimentally and theoretically. The DTPMP-derived interphase not only improves the antioxidative stability of electrolytes but also benefits the desolvation of PF anions, which doubly protect the graphitic structure and give rise to fast-charge and ultralong cycling performance of graphite cathodes in DIBs.
以石墨为阴极材料的双离子电池（DIBs）在可持续性、可承受性和环境影响方面，相较于依赖过渡金属基阴极的锂离子电池具有优势。然而，由于电解质的共嵌入和氧化分解，石墨阴极在高电位下阴离子存储过程中严重存在结构稳定性差的问题。这项工作提出了一种原位电化学驱动的途径，通过在石墨颗粒表面植入二乙烯三胺五（亚甲基膦酸）（DTPMP）来创建双功能界面。通过实验和理论研究了DTPMP的反应机理和功能。DTPMP衍生的界面不仅提高了电解质的抗氧化稳定性，还有利于PF阴离子的去溶剂化，双重保护了石墨结构，并使DIBs中石墨阴极具有快速充电和超长循环性能。
