Breaking Barriers: Binder-Assisted NiS/NiS₂ Heterostructure Anode with High Initial Coulombic Efficiency for Advanced Sodium-Ion Batteries

Abstract

Developing sodium-ion batteries (SIBs) with high initial coulombic efficiency (ICE) and long-term cycling stability is crucial to meet energy storage device requirements. Designing anode materials that could exhibit high ICE is a promising strategy to realize enhanced energy density in SIBs. A trifunctional network binder substantially improves the electrochemical performance and ICE, providing excellent mechanical properties and strong adhesion strength. A rationally designed electrode material and binder can achieve high ICE, long cycling performance, and excellent specific capacity. Here, a NiS/NiS 2 heterostructure as an anode material and a trifunctional network binder (SA-g-PAM) are designed for SIBs. Unprecedently, the anode comprising of an SAg-PAM binder achieved the highest ICE of 90.7% and remarkable cycling stability for 19000 cycles at a current density of 10 A g −1 and maintained the specific capacity of 482.3 mAh g −1 even after 19000 cycles. This exciting work provides an alternate direction to the battery industry for developing high-performance electrode materials and binders with high ICE and excellent cycling stability for energy storage devices.

Dynamically Evolving Multifunctional Protective Layer for Highly Stable Potassium Metal Anodes

“…To explore the reaction kinetic behavior of the protective layer, EIS, LSV, and GITT tests were performed. − The Nyquist plots for protected K and bare K symmetric cells at different temperatures are shown in Figure S9 of the Supporting Information, with the semicircle in the high-frequency region assigned to the interfacial resistance ( R interfacial ). The R interfacial values of protected K are much lower than those of bare K at all temperatures (Figure a).…”