Structural, electrochemical and Li-ion transport properties of Zr-modified LiNi0.8Co0.1Mn0.1O2 positive electrode materials for Li-ion batteries

被引:176
作者
Gao, Shuang [1 ]
Zhan, Xiaowen [1 ]
Cheng, Yang-Tse [1 ]
机构
[1] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA
基金
美国国家科学基金会;
关键词
Li-ion battery; Ni-rich cathode; Zirconium doping; Zirconates coating; Li-ion diffusion; Direct current polarization; LAYERED CATHODE MATERIALS; HIGH-RATE CAPABILITY; THERMAL-PROPERTIES; OXIDE CATHODES; HIGH-CAPACITY; LINI0.5CO0.2MN0.3O2; AL; PERFORMANCE; STABILITY; MG;
D O I
10.1016/j.jpowsour.2018.10.094
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We modify a nickel-rich layered LiNi0.8Co0.1Mn0.1O2 (NCM811) positive electrode material by substituting the transition metals with Zr to mitigate its structural instability and capacity degradation. We show that Zr, over a concentration range of 0.5-5.0 at.%, can simultaneously reside on and expand the lattice of NCM811 and form Li-rich lithium zirconates on their surfaces. In particular, Li(Ni0.8Co0.1Mn0.1)(0.99)Zr0.01O2 (1% Zr-NCM811) exhibits the best rate capability among all the compositions in this study. It shows higher cycling durability than the raw NCM811 at both low and high current density lithiation and de-lithiation. According to X-ray photo-electron spectroscopy and cyclic voltammetry measurements, the 1% Zr-NCM811 sample is more chemically/electrochemically stable than the raw. In addition to comparing the diffusivities in the coin-cell measurements, we demonstrate that Zr modification can facilitate Li-ion diffusion in the NCM811 balk material by direct current polarization measurements. The superior performance of Zr-NCM811 results from the lattice expansion induced by Zr doping and the presence of ion-conducting lithium zirconates partially coated on the surface of Zr-NCM811 particles.
引用
收藏
页码:45 / 52
页数:8
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