Cobalt Oxide Arrays Anchored to Copper Foam as Efficient Binder‐free Anode for Lithium Ion Batteries

Abstract

The development of lithium‐ion batteries with simplified assembling steps and fast charge capability is crucial for current battery applications. In this study, we propose a simple in‐situ strategy for the construction of high‐dispersive cobalt oxide (CoO) nanoneedle arrays, which grow vertically on a copper foam substrate. It is demonstrated that this nanoneedle CoO electrodes provide abundant electrochemical surface area. The resulting CoO arrays directly act as binder‐free anodes in lithium‐ion batteries with the copper foam functioning as the current collector. The highly‐dispersed feature of the nanoneedle arrays enhances the effectiveness of active materials, leading to outstanding rate capability and superior long‐term cycling stability. These impressive electrochemical properties are attributed to the highly‐dispersed self‐standing nanoarrays, the advantages of binder‐free constituent, and the high exposed surface area of the copper foam substrate compared to copper foil, which enrich active surface area and facilitate charge transfer. The proposed approach to prepare binder‐free lithium‐ion battery anodes streamlines the electrode fabrication steps and holds significant promise for the future development of the battery industry.

Longan-Derived Biomass Carbon-Induced Cubic-Type Ferric Oxide Nanoparticles for Efficient Lithium-Ion Battery Anodes

“…The massive consumption of fossil fuels has caused severe environmental pollution problems and an energy crisis, which necessitate the search for renewable alternatives to alleviate the current situation. − Among the various renewable energy devices, lithium-ion batteries (LIBs) have played a significant role in the field of portable electronic devices over the past decades and are now also extensively used for vehicle applications. − However, the overall performance is still far less appealing compared with the increasing requirement for industrial requirements. Graphite has been commercialized as an anode material in LiBs, but the relatively low theoretical capacity (372 mAh g –1 ) leads to a relatively low energy density of the battery. − Therefore, the investigation of anode materials with a relatively higher theoretical capacity to increase the energy density and prolong the service time is significant for the practical application of LIBs. − …”