Interfacial Engineering of a Heteroatom-Doped Graphene Layer on Patterned Aluminum Foil for Ultrafast Lithium Storage Kinetics

Abstract

The design of the interfacial architecture between the electrode and the current collector in lithium-ion batteries (LIB) plays a key role in achieving ultrafast lithium storage kinetics with respect to efficient charge transfer and cycle stability. However, in recent years, despite considerable efforts in the structural and chemical engineering of active materials (anode and cathode materials), interfacial architectures between the electrode and the current collector have received relatively insufficient attention in the case of ultrafast LIBs. Here, the interface architecture of a micropatterned Al current collector with a heteroatom-doped graphene interfacial layer is developed using roll pressing and dip coating processes. The cathode electrode fabricated with the resultant current collector offers increased contact area with enhanced interfacial stability between the electrode and the current collector because of micropatterns with heteroatom-doped graphene formed on the current collector, leading to outstanding ultrafast cycling capacity (105.8 mA h g–1) at 20 C. Furthermore, at extremely high rate and long-term cycling performance, significant ultrafast cycling stability (specific capacity of 87.1 mA h g–1 with capacity retention of 82.3% at 20 C after 1000 cycles) is noted. These improved ultrafast and ultra-stable performances are explained in terms of the increased electron collection/provision site with a high contact area between the electrode and the current collector for enhanced ultrafast cycling capacity and the effective corrosion prevention of the current collector with fast charge transfer for ultrafast cycling stability.

Surface Engineering of Carbon via Coupled Porosity Tuning and Heteroatom‐Doping for High‐Performance Flexible Fibrous Supercapacitors

“…In particular, the FFS-NFMCF displays the steepest slope, which is attributed to the superior ion-diffusion capability afforded by the mesoporous structure. Moreover, the coefficient of ion-diffusion (D) is calculated using Equations ( 1) and ( 2): [2,37] e w…”

Effects of Deep Cryogenic Treatment on the Microstructure and Properties of Rolled Cu Foil

“…The curves illustrate that the DCT-12 had better electrochemical performance than the others. The former had lower charge transfer resistance and better conductivity [ 28 ], leading to a faster electron transfer speed. The EIS spectrum is also consistent with the results of the Tafel curve.…”

Graphene: A promising candidate for charge regulation in high-performance lithium-ion batteries

“…Interface design between current collector and electroactive materials plays a key role in the charge transport for lithiumion batteries. Graphene-coated metal foils as current collectors benefit rate capability as the graphene coating could effectively reduce interfacial electric resistance [133,135,[140][141][142]. Recently, Hailin Peng et al proved interfacial electric resistance dominates, i.e., ~ 2 orders of magnitude higher than that of electrode materials, through systematic quantitative studies of the interfacial properties.…”

“…: not found from the article. (specific capacity of 87.1 mAh•g -1 with capacity retention of 82.3% at 20 C after 1,000 cycles)[135]. Besides, Xiaofei Liu et al replaced amorphous carbon with vertical graphene nanowalls as coating on Cu foil.…”