Self-Activated Formation of Hierarchical Co₃O₄ Nanoflakes with High Valence-State Conversion Capability for Ultrahigh-Capacity Zn–Co Batteries

In this work, a hierarchical Co₃O₄ nanoflakes with high valence conversion capability was synthesized by a self-activation method. When this material is applied in alkaline Zn-Co batteries, ultrahigh discharge capacity (481.4 mAh g^–1) and energy density (818.3 Wh kg^–1) can be obtained. In addition, the battery can maintain 41.9% capacity at a 20-fold increase in current density and 80% capacity after 1000 cycles.

January 2022