CuO Nanorod Arrays Formed Directly on Cu Foil from MOFs as Superior Binder-Free Anode Material for Lithium-Ion Batteries

Abstract

In this study, an in situ growth method is developed for the partial conversion of current collector into active materials for lithium ion batteries (LIBs). Through thermal treatment of a metal–organic framework (MOF) precursor, of which the metal ion is provided by a Cu foil current collector, porous CuO nanorod arrays (NRAs) can be directly formed on Cu foil. Importantly, this strategy can avoid the poor contact problem between the current collector and electrode material as well as circumvent the addition of insulating material (binder) and inhomogeneous distribution of conductive carbon material and active material on the current collector. When evaluated as binder-free electrodes for LIBs, porous CuO NRAs deliver a high specific capacity (1341 mA h g–1 at 100 mA g–1) and enhanced rate capability and cycling ability (671 mA h g–1 at 100 mA g–1 after 150 cycles).

High Capacity and Reversibility of Oxygen‐Vacancy‐Controlled MoO3 on Cu in Li‐Ion Batteries: Unveiling Storage Mechanism in Binder‐Free MoO3−x Anodes

“…The evolution of the MoO 3− x structure and oxidation states throughout electrochemical cycling was studied mainly by ex situ transmission electron microscopy (TEM) and X‐ray absorption spectroscopy (XAS). We propose an interfacial‐related Li + ‐storage mechanism in MoO 3 and demonstrate the mechanism by deliberately conjugating the electrochemical surfaces of MoO 3− x using an annealing process to deposit Cu 2 O onto MoO 3− x on Cu current collectors . The introduction of Cu 2 O affects the overall mechanism not by simply participating in the reaction with Li + ions but also by assisting the interfacial reaction of MoO 3− x .…”

X‐ray Nano‐computed Tomography of Electrochemical Conversion in Lithium‐ion Battery

“…Metal oxides such as CuO, NiO, and Fe 2 O 3 may reversibly exchange more than 1 equivalent of lithium according to a multi‐electron conversion mechanism, also called displacement, evolving within a wide potential region with remarkable specific capacity . Therefore, these oxides have been proposed as alternatives to graphite and Li‐alloys for application as anodes in LIBs characterized by their high capacity and low cost .…”

“…[12] The large volume changes occurring during the electrochemical Li-alloyingp rocess were successfully buffered by sophisticated nanostructures, benefitting from top-downa nd bottom-up material-engineering approaches, to promote the electrode stability. [13] Metal oxidess uch as CuO, [14] NiO, [15] and Fe 2 O 3 [16] may reversibly exchange more than 1equivalent of lithium according to am ulti-electron conversion mechanism, also called displacement, evolving within aw ide potentialr egion with remarkable specific capacity. [17] Therefore, these oxidesh ave been proposed as alternatives to graphite and Li-alloys for application as anodes in LIBsc haracterized by their high capacity and low cost.…”

In Situ Precipitation‐Induced Growth of Leaf‐like CuO Nanostructures on Cu–Ni Alloys for Binder‐Free Anodes in Li‐Ion Batteries

“…Table shows a summary of the recent studies on CuO nanostructure‐based anodes for LIBs. Both the gravimetric and areal capacities of the CuO‐550 electrode were superior to those of previously reported binder‐free CuO electrodes at a current density of 0.1 A g −1 (≈0.15 C) because of the thick nanostructures making up more than a few micrometers of the electrode (Figure ) …”