Scalable synthesis of mesoporous FeS 2 nanorods as high‐performance anode materials for sodium‐ion batteries

Sodium‐ion batteries (SIBs), as highly promising alternatives to lithium‐ion batteries (LIBs), can be widely used in a variety of next‐generation energy storage systems. However, the current commercial graphite anodes of LIBs could not intercalate sodium ions to appreciable extent, and the electrochemical irreversibility hinders further application. Searching for a suitable anode material is a critical issue for the successful development of SIBs. Herein, we report a convenient, fast, and large‐scale preparation method of mesoporous FeS 2 nanorods. Our specially designed one‐dimensional mesoporous structure of FeS 2 takes full advantage of ultra‐high strain relaxation as well as fast Na + transport rate arising from microstructural characteristics. As a result, the mesoporous FeS 2 nanorods exhibited excellent sodium storage performance. The discharge capacity was retained at 711.1 mAh·g −1 after 450 cycles at a current density of 1000 mA·g −1 . The special microstructure and superior performance of mesoporous FeS 2 nanorods represent a critical step for transition metal sulfides electrode materials toward practical SIBs application.