Cu3(OH)2V2O7·2H2O@rGO with bimetallic redox activity as a novel cathode material for calcium–ion batteries

Owing to the abundance of calcium and low redox potential and high safety, calcium-ion batteries (CIBs) are considered a promising candidate for post lithium-ion batteries. Cu 3 (OH) 2 V 2 O 7 ·2H 2 O@rGO with bimetallic redox activity is proposed as a novel cathode material for CIBs.