期刊
ELECTROCHIMICA ACTA
卷 330, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135198
关键词
Nickel hydroxide; Co-Al layered double hydroxide; Nickel-based rechargeable batteries; Cathode materials
资金
- Funds of the Natural Science Foundation of China [51604098, 51674105]
- Program for Excellent Youth Foundation of Henan Province [184100510005]
- Program for Innovative Research Team in University of Henan Province [18IRTSTHN003]
A series of Co-Al layered double hydroxide nanosheets-coated spherical nickel hydroxide with improved high-rate and cycling performance are successfully synthesized through a hydrothermal method. Scanning electron microscopy images show that Co-Al layered double hydroxide is uniformly anchored on the surface of nickel hydroxide. As cathode material for nickel-based battery, the Ni(OH)(2)@Co-Al layered double hydroxide(10%) displays a highest high-rate properties and cycling performance. The discharge capacities of the as-obtained Ni(OH)(2)@Co-Al LDH(10%) reach up to 299.7, 276.6, 247.5 and 223.2 mA h g(-1) at 0.2,1.0, 5.0 and 10.0C, respectively. After 500 cycles at 1C/1C, the Ni(OH)(2)@Co-Al LDH (10(wt)%) delivers a high capacity retention of 87.3%. These performance improvements are ascribed to the fact that Co-Al layered double hydroxide not only forms a stable high conductive layer of beta-CoOOH and gamma-CoOOH, but also provides many capacity through a reversible conversion between and gamma-CoOOH and CoAl LDHs, eventually leading to the improvement of the reversible property, proton diffusion and conductivity of the Ni(OH)(2) cathode. Consequently, the spherical Ni(OH)(2)@Co-Al layered double hydroxide(10%) is a promising cathodes material for advanced nickel-based secondary batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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