Effects of TiO2 coating on electrochemical performance of LiNi0.5Mn1.5O4 cathode materials

被引：0

作者：

Chang Q. ^{[1
]}

Wei A.-J. ^{[2
]}

Li W. ^{[2
]}

Zhang L.-H. ^{[2
]}

Liu Z.-F. ^{[1
,2
]}

机构：

[1] School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin

[2] Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 03期

关键词：

Cathode material; Cycling stability; LiNi[!sub]0.5[!/sub]Mn[!sub]1.5[!/sub]O[!sub]4[!/sub; Rate performance; TiO[!sub]2[!/sub] coating layer;

D O I：

10.3969/j.issn.1003-9015.2019.03.027

中图分类号：

学科分类号：

摘要：

LiNi0.5Mn1.5O4 (LNMO) cathode materials were coated by TiO2 to enhance electrochemical performance. Structural characterization and electrochemical performance evaluation of the prepared materials were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy system (XPS), galvanostatic charge-discharge, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. The results indicate that there is a TiO2 layer on the surface of LNMO, and the LNMO-T-2 sample coated with w = 1.0% TiO2 exhibits the best rate capability and cycling stability. The corresponding discharge capacities of LNMO-T-2 were 102.3 and 72.1 mAh∙g-1, respectively, which showed an improvement of 14.3% and 33.5% at 5 and 7 C (1 C = 140 mAh∙g-1) compared with raw LNMO. Moreover, LNMO-T-2 kept 87.9% discharge capacity after 200 cycle charge-discharged tests at 2 C, which was higher than raw LMNO (82.7%). The improvement was due to TiO2 can reduce electrode polarization and charge-transfer resistance (Rct). © 2019, Editorial Board of Journal of Chemical Engineering of Chinese Universities". All right reserved."

引用

页码：715 / 723

页数：8

共 32 条

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