Abstract
In this work, a freestanding and binder-free NiS2/FeS holey film is developed using a facile and scalable electrochemical route . Both experimental study and computational investigation were performed to have an insightful understanding of the charge storage mechanism of this advanced energy material for LSBs. Such freestanding NiS2/FeS holey film provides unique merits for LSBs: i) Porous structure of holey film enables a large surface area for an enhanced ion/mass diffusion and reduced volume expansion; ii) The binder-free electrode combines the current collector (residual NiFe alloy) and active materials (sulfides) together, improving electron transport; iii) Sulfides are more stable as active materials than sulfur, showing only a small capacity decay while retaining high cyclability performance. A high volumetric capacity of 580 mAh cm-3 and a long-term stability over 1000 discharge-charge cycles were, therefore, achieved due to these merits.
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