Electrosprayed Robust Graphene Layer Constructing Ultrastable Electrode Interface for High-Voltage Lithium-Ion Batteries

Aluminum (Al) foil serving as the most widely used cathode current collector for lithium-ion batteries (LIBs) is still not flawless to fulfill the increasing demand of rechargeable energy storage systems. The limited contact area and weak adhesion to cathode material as well as local corrosion during long-term operations could deteriorate the performance of LIBs with a higher working voltage. Herein, a reduced graphene oxide (RGO)-modified Al foil (RGO/Al) is developed via electrospraying to increase interfacial adhesion and inhibit anodic corrosion as a functional current collector. Valid corrosion resistance to electrolyte and strengthened adhesion of electrode particles to current collectors are beneficial to improve the interfacial reaction dynamics. The RGO/Al-based LiNi0.5Mn1.5O4 cells (LNMO-RGO/Al) exhibit better electrochemical performances in terms of long-term cycling discharge capacity retention (90% after 840 cycles at 1 C), rate capability (101.8 mAh g–1 at 5 C), and interfacial resistance, prominently superior to bare Al-based cells (LNMO-Al). This work not only contributes to long-term stable operation of high-voltage LIBs but also brings new opportunities for the development of next-generation 5 V LIBs.