TY - JOUR
T1 - Cation-Disordered Lithium-Excess Li-Fe-Ti Oxide Cathode Materials for Enhanced Li-Ion Storage
AU - Yang, Meng
AU - Jin, Junyang
AU - Shen, Yinlin
AU - Sun, Shijiao
AU - Zhao, Xiangyu
AU - Shen, Xiaodong
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/11/27
Y1 - 2019/11/27
N2 - Cation-disordered Li-excess lithium-transition metal (Li-TM) oxides designed based on the percolation theory are regarded as a promising new type of high-performance cathode material for Li-ion batteries. Herein, cation-disordered rocksalt-type Li-Fe-Ti oxides of Li0.89Fe0.44Ti0.45O2, Li1.18Fe0.34Ti0.45O2, and Li1.24Fe0.38Ti0.38O2 with different Li-to-transition metal ratios (Li/TM = 1, 1.49, or 1.63) are investigated to understand the effect of a Li excess on the electrochemical Li-ion storage properties. The Li excess leads to local structural fluctuations of the as-prepared Li-Fe-Ti oxides, contributing to the formation of 0-TM diffusion channels for rapid Li-ion migration. The as-prepared Li-excess Li-Fe-Ti oxide cathodes (Li/TM = 1.49 and Li/TM = 1.63) deliver a higher reversible capacity of over 220 mAh g-1 and a better rate capability compared to the Li/TM = 1 electrode, which possesses a maximum discharge capacity of only about 165 mAh g-1. The redox reactions of Fe2+/Fe3+ and O2-/O2 2- achieve the main capacity of the Li-excess Li-Fe-Ti oxide cathodes during cycling, as supported by 57Fe Mössbauer spectroscopy, O 1s X-ray photoelectron spectroscopy, and O K-edge soft X-ray absorption spectroscopy.
AB - Cation-disordered Li-excess lithium-transition metal (Li-TM) oxides designed based on the percolation theory are regarded as a promising new type of high-performance cathode material for Li-ion batteries. Herein, cation-disordered rocksalt-type Li-Fe-Ti oxides of Li0.89Fe0.44Ti0.45O2, Li1.18Fe0.34Ti0.45O2, and Li1.24Fe0.38Ti0.38O2 with different Li-to-transition metal ratios (Li/TM = 1, 1.49, or 1.63) are investigated to understand the effect of a Li excess on the electrochemical Li-ion storage properties. The Li excess leads to local structural fluctuations of the as-prepared Li-Fe-Ti oxides, contributing to the formation of 0-TM diffusion channels for rapid Li-ion migration. The as-prepared Li-excess Li-Fe-Ti oxide cathodes (Li/TM = 1.49 and Li/TM = 1.63) deliver a higher reversible capacity of over 220 mAh g-1 and a better rate capability compared to the Li/TM = 1 electrode, which possesses a maximum discharge capacity of only about 165 mAh g-1. The redox reactions of Fe2+/Fe3+ and O2-/O2 2- achieve the main capacity of the Li-excess Li-Fe-Ti oxide cathodes during cycling, as supported by 57Fe Mössbauer spectroscopy, O 1s X-ray photoelectron spectroscopy, and O K-edge soft X-ray absorption spectroscopy.
KW - Li-Fe-Ti oxide
KW - Li-excess
KW - cation-disordered
KW - electrochemical performance
KW - oxygen redox
UR - http://www.scopus.com/inward/record.url?scp=85075058260&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b14137
DO - 10.1021/acsami.9b14137
M3 - 文章
C2 - 31687798
AN - SCOPUS:85075058260
SN - 1944-8244
VL - 11
SP - 44144
EP - 44152
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 47
ER -