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NiS 2 /FeS Holey Film as Freestanding Electrode for High‐Performance Lithium Battery
Author(s) -
Liang Kun,
Marcus Kyle,
Zhang Shoufeng,
Zhou Le,
Li Yilun,
De Oliveira Samuel T.,
Orlovskaya Nina,
Sohn YongHo,
Yang Yang
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201701309
Subject(s) - materials science , electrode , anode , electrochemistry , current collector , lithium (medication) , battery (electricity) , cathode , conductivity , chemical engineering , electrolyte , optoelectronics , composite material , electrical engineering , medicine , power (physics) , chemistry , physics , engineering , quantum mechanics , endocrinology
In this work, a freestanding NiS 2 /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 NiS 2 /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.