Marriage of an Ether-Based Electrolyte with Hard Carbon Anodes Creates Superior Sodium-Ion Batteries with High Mass Loading

• DOI: 10.1021/acsami.8b15274
• Publication Date: 2018-11-07T13:50:00Z
• Authors: Yongwu He; Panxing Bai; Shuyan Gao; Yunhua Xu
• Keywords: Carbon fibers; High mass

Inferior rate performance, insufficient cycle life, and low mass loading have restricted the practical application of hard carbon (HC) anodes in sodium-ion batteries (NIBs). Here, a compatible strategy is developed by matching HC with an ether-based electrolyte. Systematical investigation reveals that good compatibility electrode–electrolyte systems forms thinner but more sustainable solid-electrolyte interphase delivers higher ionic conductivity Na+ ion diffusion coefficient than commonly used ester-based electrolytes. Therefore, excellent electrochemical performance demonstrated long life (∼196 mA h/g 90% capacity retention after 2000 cycles at 1 A/g), super capability (∼51% 10 A/g) 1.5 mg/cm2, high initial Coulombic efficiency 85.9%. More importantly, reversible areal 4.3 h/cm2 can be achieved ultrahigh 17 superior to all reported anodes. Our findings not only shed light on design high-performance battery also promise commercial transformation from lab test production NIBs.