Formation of NiCo 2 V 2 O 8 Yolk–Double Shell Spheres with Enhanced Lithium Storage Properties

Complex nanostructures with multi‐components and intricate architectures hold great potential in developing high‐performance electrode materials for lithium‐ion batteries (LIBs). Herein, we demonstrate a facile self‐templating strategy for the synthesis of metal vanadate nanomaterials with complex chemical composition of NiCo 2 V 2 O 8 and a unique yolk–double shell structure. Starting with the Ni‐Co glycerate spheres, NiCo 2 V 2 O 8 yolk–double shell spheres are synthesized through an anion‐exchange reaction of Ni‐Co glycerate templates with VO 3 − ions, followed by an annealing treatment. By virtue of compositional and structural advantages, these NiCo 2 V 2 O 8 yolk–double shell spheres manifest outstanding lithium storage properties when evaluated as anodes for LIBs. Impressively, an extra‐high reversible capacity of 1228 mAh g −1 can be retained after 500 cycles at a high current density of 1.0 Ag −1 .