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

Abstract

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.