Hierarchical SnO2 Nanosheets Array as Ultralong-Life Integrated Anode for Lithium-Ion Batteries.

Integrated SnO2 electrode with hierarchical nanosheets array structure growing on three-dimensional (3D) macroporous Ni foam substrates is successfully prepared via a facile and effective template-free route. The self-supported integrated electrode can be directly used as anode for lithium-ion batteries (LIBs) without adding any ancillary materials. As a result, such integrated electrode exhibits superior electrochemical performances. It maintains a high reversible discharge capacity of 1617.8mAhg and a high cycling stability of 829.2mAhg even after 500 cycles. The unique structural features with large areas, shorter transport path of ion and electron as well as robust mechanical strength are probably responsible for the enhanced performance. Hierarchical binder-free SnO2 nanosheet array integrated electrodes are successfully prepared by a facile, safety, and environmental friendliness, yet very effective strategy. When evaluated as anode electrode for LIBs, high capacities as well as superior long cycle life are achieved. It is the best performance of pure SnO2 nanoarray integrated electrodes in LIBs. [ABSTRACT FROM AUTHOR]