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Higher Than 90% Initial Coulombic Efficiency with Staghorn‐Coral‐Like 3D Porous LiFeO 2− x as Anode Materials for Li‐Ion Batteries
Author(s) -
Yang Yaxiong,
Qu Xiaolei,
Zhang Xin,
Liu Yongfeng,
Hu Jianjiang,
Chen Jian,
Gao Mingxia,
Pan Hongge
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201908285
Subject(s) - faraday efficiency , anode , materials science , porosity , ion , lithium (medication) , chemical engineering , nanotechnology , electrode , composite material , chemistry , organic chemistry , medicine , engineering , endocrinology
Transition metal oxides represent a promising class of anode materials for high‐capacity lithium‐ion batteries. However, low initial coulombic efficiency (ICE, <80%) still remains a crucial challenge for practical applications. Herein, a unique 3D Fe(II)‐rich porous LiFeO 2− x comprising of staghorn‐coral‐like skeleton measuring ≈100 nm in diameter is demonstrated, which is readily prepared by reacting Fe 2 O 3 with LiH at 550 °C. When used as an anode material, the Fe(II)‐rich LiFeO 2− x delivers the presently known highest ICE value of 90.2% with 1170 mAh g −1 discharge capacity. The high ICE value can be ascribed to a fast conversion reaction of LiFeO 2− x upon lithiation/delithiation facilitated by the presence of Fe(II), which generates oxygen vacancies and makes electron transportation much easier, based on the experimental results and density functional theory (DFT) calculations.