期刊
SOLID STATE IONICS
卷 349, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ssi.2020.115292
关键词
Ni-rich cathode material; Li2TiO3; Li2ZrO3; Co-modification; Lithium-ion batteries
资金
- Natural Science Foundation of Jiangxi Province [20192BAB206021]
- Foundation of Jiangxi Educational Committee [GJJ190423, 190427]
- Finance and Education Plan of Ganzhou City [50[2018], 60[2019]]
- Science Foundation of Anhui Province [KJ2017A575]
- National Natural Science Foundation of China [51874151]
LiNi0.8Co0.1Mn0.1O2 (NCM) materials with surface modification by Li2TiO3 (LTO), Li2ZrO3 (LZO) and Li2TiO3-Li2ZrO3 (LTZO) coatings are successfully synthesized via a simple wet chemical method and proper heat-treatment process. The crystal structure, surface morphology, valence states and electrochemical properties of different modified NCM materials are investigated by the means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The NCM co-modified by Li2TiO3 and Li2ZrO3 composite coatings (LTZO@NCM) shows remarkable improvements in cycling performance and rate capability, the discharge capacity is 190.36 mAh g(-1) with high capacity retention of 92.64% at 0.2C after 100 cycles between 2.75 and 4.4 V, compared to 174.83 mAh g(-1) with the capacity retention of 87.20% for pristine NCM. Even at a high current density of 1 C, LTZO@NCM still maintains a high discharge capacity of 149.77 mAh g(-1) cycled at high cut-off voltage of 4.4 V, with a capacity retention rate of 83.04% at 150th cycle, while bare NCM only delivers 123.92 mAh g(-1) with capacity retention of 68.86%. The enhanced electrochemical performance can be ascribed to the modified effect of LTZO nano-coating layer on the NCM surface. LTZO nano-coating layer can not only effectively protect NCM particles, avoid the occurrence of side reaction, but also provide a better Li+ transport channels, improve lithium ion diffusion rate and enhance the structure stability and electrochemical performances of NCM material.
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