Construction of robust solid-electrolyte interphase via electrode additive for high-performance Sn-based anodes of sodium-ion batteries

• DOI: 10.1016/j.ensm.2024.103334
• Publication Date: 2024-03-08T09:40:25Z
• Authors: Cheng Zheng; Qian Yao; Rui Li; Deluo Ji; Chunting Wang; Zhongchao Bai; Nana Wang; Shixue Dou; Huakun Liu; Jian Yang
• Keywords: Interphase

Alloy-based Sn anode for sodium-ion batteries has attracted tremendous attention due to its low working voltage, high specific capacity, and good availability. Its application is hindered, however, by inferior cycling stability huge volume changes unstable solid-electrolyte interphase (SEI) film. Herein, tetraphenylphosphonium bis(trifluoromethanesulfonyl)imide (TPPTFSI) introduced into the electrode spontaneously adsorbed on surfaces of commercial microparticles (μ-Sn) improve electrochemical performance anode. In first cycle, TPP+ component TPPTFSI decomposes form an organic SEI film, thereby enhancing flexibility. Meanwhile, TFSI− converted inorganic constituent SEI, improving robustness ionic conductivity. Therefore, μ-Sn enhanced significantly. The modified electrode, TPPTFSI-Sn, delivers a capacity 619.7 mAh g−1 after 2000 cycles at 2.0 A g−1, while control sample can only survive 30 cycles. Importantly, full cell also exhibits excellent performance, including rate stability. simple operation remarkable improvement indicate promising prospects this strategy advanced electrodes in SIBs.