Layered P2-Na2/3[Ni1/3Mn2/3]O2 as high-voltage cathode for sodium-ion batteries: The capacity decay mechanism and Al2O3 surface modification

被引:295
|
作者
Liu, Yihang [1 ]
Fang, Xin [2 ]
Zhang, Anyi [2 ]
Shen, Chenfei [2 ]
Liu, Qingzhou [2 ]
Enaya, Hani A. [3 ,4 ]
Zhou, Chongwu [1 ]
机构
[1] Univ Southern Calif, Dept Elect Engn, Los Angeles, CA 90089 USA
[2] Univ Southern Calif, Dept Chem Engn & Mat Sci, Los Angeles, CA 90089 USA
[3] King Abdulaziz City Sci & Technol, Riyadh, Saudi Arabia
[4] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA
关键词
Sodium-ion batteries; High voltage cathode; Surface coating; Exfoliation; P2-Na-2/3[Ni1/3Mn2/3]O-2; Layered metal oxide cathode; POSITIVE ELECTRODE; P2-TYPE;
D O I
10.1016/j.nanoen.2016.06.026
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
The P2 type Na-2/3[Ni1/3Mn2/3]O-2 is a high-voltage cathode material for Na-ion batteries with a theoretical capacity of 173 mA h/g and a long operation voltage plateau of 4.2 V. However, the material has exhibited unstable cycling performance within the high-voltage window, which severely limits its application. Moreover, its capacity decay mechanism is still unclear. In this study, we first investigate the difference between as-prepared and after-cycling Na-2/3[Ni1/3Mn2/3]O-2 samples, and then confirmed that the transition metal oxide layer exfoliation associated with the crystal phase transition during Na ion extraction and insertion is the main cause of capacity fading. The Al2O3 coated Na-2/3[Ni1/3Mn2/3]O-2 with enhanced cycling performance was prepared by taking the benefit of Al2O3 coating. The Na-2/3[Ni1/3Mn2/3]O-2 sample without any surface modification presented a 164 mA h/g initial specific discharge capacity within the voltage window from 2.5 V to 4.3 V, and the capacity decayed to 44 mA h/g at the 300th cycle, resulting in only a 26.8% retention. In contrast, the Al2O3-coated Na-2/3[Ni1/3Mn2/3]O-2 presented a similar initial capacity, but with an enhanced 73.2% retention after 300 cycles. The enhanced cycling stability observed in after-cycling characterization and analysis confirms that the Al2O3 surface coating can effectively suppress the unfavorable side reaction at high voltage and the exfoliation of the metal oxide layers. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:27 / 34
页数:8
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