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Highly Stable Cycling of Amorphous Li 2 CO 3 ‐Coated α‐Fe 2 O 3 Nanocrystallines Prepared via a New Mechanochemical Strategy for Li‐Ion Batteries
Author(s) -
Yang Yaxiong,
Liu Yongfeng,
Pu Kaichao,
Chen Xing,
Tian He,
Gao Mingxia,
Zhu Min,
Pan Hongge
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201605011
Subject(s) - materials science , amorphous solid , ion , cycling , chemical engineering , nanotechnology , inorganic chemistry , crystallography , organic chemistry , chemistry , engineering , archaeology , history
In this study, an amorphous Li 2 CO 3 ‐coated nanocrystalline α‐Fe 2 O 3 hierarchical structure is synthesized for the first time using a facile one‐step mechanochemical process at room temperature, taking advantage of the concurrence of repeated fracture‐cold welding of material's particles and a gas‐solid redox reaction. The conformal coating and hierarchical structure significantly increase the cycling durability and rate capability. Typically, a 1–3 nm thick amorphous Li 2 CO 3 layer is conformally coated on Fe 2 O 3 nanocrystallines (≈10 nm in size) that form hierarchically aggregated particles 400–800 nm in size by ball milling α‐Fe 2 O 3 with LiH in CO 2 . The prepared Li 2 CO 3 ‐coated nanocrystalline α‐Fe 2 O 3 exhibits highly stable long‐term cyclability as it delivers a reversible capacity of 975 mAh g −1 with 99% of retention after 400 cycles at 100 mA g −1 . At a high rate of 3000 mA g −1 , its reversible capacity still remains at 537 mAh g −1 , superior to the uncoated counterpart (311 mAh g −1 ). Moreover, amorphous Li 2 O and Li 2 CO 3 coatings are also similarly produced on Fe 2 O 3 and NiO nanocrystallines, respectively, representing the general applicability of this mechanochemical approach.