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Silica Restricting the Sulfur Volatilization of Nickel Sulfide for High‐Performance Lithium‐Ion Batteries
Author(s) -
Li Qidong,
Li Li,
Wu Peijie,
Xu Nuo,
Wang Liang,
Li Matthew,
Dai Alvin,
Amine Khalil,
Mai Liqiang,
Lu Jun
Publication year - 2019
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.201901153
Subject(s) - materials science , anode , electrochemistry , lithium (medication) , energy storage , chemical engineering , sulfide , electrode , nickel , nanotechnology , metallurgy , chemistry , medicine , endocrinology , power (physics) , physics , quantum mechanics , engineering
Nickel sulfides are regarded as promising anode materials for advanced rechargeable lithium‐ion batteries due to their high theoretical capacity. However, capacity fade arising from significant volume changes during operation greatly limits their practical applications. Herein, confined NiS x @C yolk–shell microboxes are constructed to address volume changes and confine the active material in the internal void space. Having benefited from the yolk–shell structure design, the prepared NiS x @C yolk–shell microboxes display excellent electrochemical performance in lithium‐ion batteries. Particularly, it delivers impressive cycle stability (460 mAh g −1 after 2000 cycles at 1 A g −1 ) and superior rate performance (225 mAh g −1 at 20 A g −1 ). Furthermore, the lithium storage mechanism is ascertained with in situ synchrotron high‐energy X‐ray diffractions and in situ electrochemical impedance spectra. This unique confined yolk–shell structure may open up new strategies to create other advanced electrode materials for high performance electrochemical storage systems.