祝贺夏吉利等同学的文章
“Rational Design of a Trifunctional Binder for Hard Carbon Anodes Showing High Initial Coulombic Efficiency and Superior Rate Capability
for Sodium-Ion Batteries”
被Advanced Functional Materials 接受发表！
Ji-Li Xia, An-Hui Lu, Xiao-Fei Yu, and Wen-Cui Li*, Rational Design of a Trifunctional Binder for Hard Carbon Anodes Showing High Initial Coulombic Efficiency and Superior Rate Capability for Sodium-Ion Batteries. Advanced Functional Materials, 2021, 2104137. DOI:10.1002/adfm.202104137. [DOWNLOAD]
Abstract
Hard carbon (HC) has emerged as a promising anode material for sodium-ion batteries (SIBs), whereas it suffers from low initial Coulombic efficiency (ICE) and poor rate capability. Binders endowed with high electron/ion transport and strong mechanical integrity are expected to boost the practical application of HC anodes, which cannot be realized via the functional design of commercially available binders. Herein, a trifunctional sodium alginate (SA)/polyethylene oxide (PEO) binder with massive hydrophilic functional groups and abundant Na+ is synthesized via a feasible esterification reaction. The binder forms a passivation film on glucose-derived carbon (GC) to suppress the electrolyte decomposition and offer stronger adhesion strength. Furthermore, the sluggish Na+conduction is improved via sufficient ionic transfer channels provided by PEO. Notably, effects of Na+ compensation and interfacial ionic transport of Na+-containing binder for HC anodes are revealed. Therefore, the SA/PEO binder for the GC anode delivers a high ICE up to 87% and a high capacity of 270 mA h g-1 at 0.1 A g-1, both 10% and 90 mA h g-1 higher than that of PVDF binder, respectively. Significantly, this SA/PEO binder can also be applied to coal-based and polymer-based carbon anodes, exhibiting universal applicability.
