FeNi-LDH Intercalation for Suppressing the Self-Discharge of VB2-Air Battery

The VB2-air battery is currently known for the highest theoretical specific capacity, up to 4060 mAh g-1. This together with the excellent environmental compatibility and high security endues with a promising application prospects for the battery. However, the self-discharge of the anode caused by hydrogen evolution corrosion results into severe capacity loss during the discharging. In this work, we studied the FeNi-LDH intercalation for suppressing the self-discharge of VB2-air battery. We adopt the vertical FeNi-LDH arrays to modify VB2 particles. Hydroxyl ions participating in the discharge reaction are transported along adsorbed water molecules and hydroxide host layers through rapid hydrogen bond formation and cleavage to the VB2 surface, while the depolarizer hydrogen ions are isolated. The hydrogen evolution corrosion on VB2 anode is effectively suppressed. As a result, the discharge specific capacity of the battery is increased by 700 mAh g-1.