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The large volume expansion of FeS2 is successfully accommodated via a series of asynchronous redox reactions of dual-crystalline FeS2. Consequently, a durable sodium storage performance with a reversible capacity of 567.7 mA h g−1 is obtained at 0.1 A g−1 after 50 cycles. This novel strategy can also be utilized in other types of electrodes having large volume change upon cycling.

Graphical abstract: Asynchronous reactions of “self-matrix” dual-crystals effectively accommodating volume expansion/shrinkage of electrode materials with enhanced sodium storage

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