Fluorine Doping of LiNi3/8Co2/8Mn3/8O2 Cathode Material for Lithium-ion Batteries

Abstract

Abstract: The layered LiNi_3/8Co_2/8Mn_3/8O_2-yF__y(y=0, 0.05, 0.10, 0.20) samples were prepared by using the co-precipitated hydroxide as precursor, and characterized by means of XRD,
XPS, SEM, cyclic voltammetry, charge/discharge tests, DSC etc techniques. The results show that fluorine doping can not induce the valence change of transition metal ions in LiNi_3/8Co_2/8Mn_3/8O_2-yF_y
samples. The samples with y=0.05, 0.10 show better cycling performance with no expense of capacity compared with undoped one, 97.5%, 96.2% capacity retention respectively after 30 cycles can be reached.
The c_h lattice expanding of samples with y=0.05, 0.10 reduces from 2.06% of undoped one to 1.017%, 1.018% respectively when lithium is de-intercalated, contributing to the improvement of structure stability
and electrochemical cycle character. However, the sample with y=0.20 exhibits lower capacity and faster capacity fading upon cycling, due to high cation disordering and internal impedance. Fluorine doping also
accelerates agglomeration of particles of the samples, enhancing operability of electrode preparation of the cathodes. In addition, fluorine-doped samples have better thermal stability than LiNi_3/8Co_2/8Mn_3/8O₂.

Key words: lithium ion batteries, LiNi_3/8Co_2/8Mn_3/8O₂ cathode material, fluorine doping

CLC Number:

TM912

LI Jian-Gang,WAN Chun-Rong,YANG Dong-Ping,YANG Zhang-Ping. Fluorine Doping of LiNi_3/8Co_2/8Mn_3/8O₂ Cathode Material for Lithium-ion Batteries[J]. Journal of Inorganic Materials.

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Fluorine Doping of LiNi_3/8Co_2/8Mn_3/8O₂ Cathode Material for Lithium-ion Batteries

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