| 總結: | The severe shuttle effect of soluble polysulfides hinders the development of lithium–sulfur batteries. Herein, we develop a three-dimensionally ordered macro/mesoporous (3DOM) Nb<sub>2</sub>O<sub>5</sub>/Nb<sub>4</sub>N<sub>5</sub> heterostructure, which combines the strong adsorption of Nb<sub>2</sub>O<sub>5</sub> and remarkable catalysis effect of Nb<sub>4</sub>N<sub>5</sub> by the promotion “adsorption-transformation” mechanism in sulfur reaction. Furthermore, the high electrocatalytic activity of Nb<sub>4</sub>N<sub>5</sub> facilitates ion/mass transfer during the charge/discharge process. As a result, cells with the S-Nb<sub>2</sub>O<sub>5</sub>/Nb<sub>4</sub>N<sub>5</sub> electrode delivered outstanding cycling stability and higher discharge capacity than its counterparts. Our work demonstrates a new routine for the multifunctional sulfur host design, which offers great potential for commercial high-performance lithium–sulfur batteries.
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