In this work, a freestanding NiS2/FeS holey film (HF) is prepared after electrochemical anodic and chemical vapor deposition treatments. With the combination of good electrical conductivity and holey structure, the NiS2/FeS HF presents superior electrochemical performance, due to the following reasons: (i) Porous structure of HF provides a large surface area and more active sites/channels/pathways to enhance the ion/mass diffusion. Moreover, the porous structure can reduce the damage from the volumetric expansion. (ii) The as‐prepared electrode combines the current collector (residual NiFe alloy) and active materials (sulfides) together, thus reducing the resistance of the electrode. Additionally, the good conductivity of HF can improve electron transport. (iii) Sulfides are more stable as active materials than sulfur, showing only a small capacity decay while retaining high cyclability performance. This work provides a promising way to develop high energy and stable electrode for Li‐S battery.
An ultrathin, freestanding NiS nanoporous thin-film was developed by facile electrochemical deposition, etching, anodization and chemical vapor treatments. The NiS nanoporous thin-film shows excellent reversible insertion/extraction of Mg ions and long-term cycling performance, which is an ideal energy storage device for small/micro-size electronic and medical devices.
The fabrication of a freestanding NiS2/FeS holey film by electrochemically anodic and thermal treatments is reported by Yang Yang and co-workers in article number 1701309. With the combination of good electrical conductivity and porous structure, the NiS2/FeS holey film presents superior electrochemical performance towards lithium storage. This work opens a new paradigm for high energy and long-lifetime lithium batteries.
LITHIUM BATTERIES
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