In Situ Growth of CoP₃/Carbon Polyhedron/CoO/NF Nanoarrays as Binder‐Free Anode for Lithium‐Ion Batteries with Enhanced Specific Capacity

Abstract Advanced functional materials enable lithium‐ion batteries to reach high specific capacity. To achieve this goal, nickel foam (NF), as current collector, is chosen to in situ form aligned nanoarrays composed of CoP₃/carbon polyhedron (CP)/CoO. The CoO nanowire acts as bridge to link NF and CoP₃/CP which not only reinforces the adhesion between active material and NF but also enhances the capacity of whole electrode. Besides, CoP₃ is evenly coupled with CP, which can effectively buffer the volume expansion of CoP₃ during the charge/discharge process. Moreover, the novel architecture of CoP₃/CP/CoO/NF is beneficial to improve the electronic conductivity. As a result, the CoP₃/CP/CoO/NF anode delivers an ultrahigh specific capacity of 1715 mAh g⁻¹ at 0.5 A g⁻¹ which can remain at 1150 mAh g⁻¹ after 80 cycles, demonstrating the good durability. Thus, this work develops a facile strategy to design self‐supporting electrodes for an enhanced energy storage device.