A simple approach to fabricate of Ni-NiCo2O4@ZnCo2O4 yolk-shell nano-tetrahedron composite as high-performance anode material for lithium-ion batteries.

Graphical abstract A simple co-precipitation approach to fabricate the Ni-NiCo 2 O 4 @ZnCo 2 O 4 yolk-shell nano-tetrahedron composites has been developed, which significantly improve the structural stability and conductivity of composite materials and exhibit excellent cycling and rate performance for lithium ion batteries. Highlights • A Ni-NiCo 2 O 4 @ZnCo 2 O 4 yolk-shell nano-tetrahedron has been prepared. • The capacity is up to 1571.9 mA h g−1 at 0.1 A g−1. • Ni-NiCo 2 O 4 @ZnCo 2 O 4 exhibited excellent rate capability and cycle stability. • Its excellent electrochemical performance came from yolk-shell architecture and the Ni-doping. Abstract Transition-metal oxide materials have gained significant attention as high-performance anode materials for lithium ion batteries. Great advances have been achieved in the development of micro/nanostructured materials with controllable shape and tunable pore size. In this work, a facile co-precipitation approach has been developed to fabricate the Ni-NiCo 2 O 4 @ZnCo 2 O 4 yolk-shell nano-tetrahedron composites, which significantly improve the structural stability and conductivity of the material. The Ni-NiCo 2 O 4 @ZnCo 2 O 4 is proven to exhibit excellent cycling and rate performance for lithium ion batteries, such as the charge capacity of 1571.9 mA h g−1 after 70 cycles at 0.1 A g−1, 1097.5 mA h g−1 after 600 cycles at 1.0 A g−1. This superior electrochemical performance may attribute to the yolk-shell architecture and the Ni-doping. [ABSTRACT FROM AUTHOR]