LI Yanwei, PAN Guanlin, YAO Jinhuan, et al. Preparation and lithium ion storage performance of nano-sized β-Ni(OH)2[J]. CIESC Journal, 2015, (12): 5088-5095. DOI: 10.11949/j.issn.0438-1157.20150624.
LI Yanwei, PAN Guanlin, YAO Jinhuan, et al. Preparation and lithium ion storage performance of nano-sized β-Ni(OH)2[J]. CIESC Journal, 2015, (12): 5088-5095. DOI: 10.11949/j.issn.0438-1157.20150624.DOI:
Ni(OH)2 sample is prepared by chemical precipitation method with Ni(NO3)2·6H2O and NaOH as raw materials. X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) analysis reveal that the sample is β-Ni(OH)2 with sheet-like hierarchical nanostructure. Cyclic voltammograms (CV) and charge-discharge tests are performed to study the lithium ion storage performance of the β-Ni(OH)2 sample. The results show that the prepared β-Ni(OH)2 sample has a very high lithium ion storage activity. For example
at a charge-discharge current density of 50 mA·g-1
the discharge capacity of the third cycle for the prepared β-Ni(OH)2 is higher than 1550 mA·h·g-1. The carbon content in electrode has a great influence on both the cyclic stability and rate performance of the β-Ni(OH)2 sample. The mechanism of carbon content on lithium storage performance of the β-Ni(OH)2 sample is analyzed by electrochemical impedance spectroscopy (EIS) tests.