SnS2 Nanosheets Coating on Nanohollow Cubic CoS2/C for Ultralong Life and High Rate Capability Half/Full Sodium‐Ion Batteries

Sodium‐ion batteries (SIBs) have attracted tremendous interest and become a worldwide research hotpot owing to their low cost and abundant resources. To obtain suitable anode materials with excellent performance for SIBs, an effective and controllable strategy is presented to fabricate SnS2 nanosheets coating on nanohollow cubic CoS2/C (CoS2/C@SnS2) composites with a hollow structure using Co‐metal‐organic frameworks as the starting material. As anodes for SIBs, the CoS2/C@SnS2 electrode exhibits ultralong cycle life and excellent rate performance, which can maintain a high specific capacity of 400.1 mAh g−1 even after 3500 cycles at a current density of 10 A g−1. When used in a full‐cell, it also shows enhanced sodium storage properties and delivers a high reversible capacity of 567.3 mAh g−1 after 1000 cycles at 1 A g−1. This strategy can pave a way for preparing various metal sulfides with fascinating structure and excellent performance for the potential application in energy storage area. The CoS2/C@SnS2 exhibits ultralong cycle life and high rate capability. The reversible capacity can maintain 854.5 mAh g−1 at a current density of 0.1 A g−1. Even at a high current density of 10 A g−1, the reversible capacity can maintain 400.1 mAh g−1 after 3500 cycles. As for CoS2/C@SnS2‐Na3V2(PO4)3 full‐cells, one full‐cell can light up 41 light‐emitting diodes bulbs.