Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 21, Pages 31470-31477Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.07.066
Keywords
Lithium -ion batteries; Ni-ferrite; Nanostructure materials; Co -precipitation; Crystalline structure; Spinel materials
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A nanostructured Ni-ferrite material, NiFe2O4, with superior electrochemical properties, including high reversible capacity and long cyclability, was successfully synthesized through co-precipitation in hot water followed by an annealing process. The excellent performance can be attributed to the nano-sized materials, the unique properties of the Ni-ferrite spinel, as well as the protection and catalytic effect of the spinel structure and the presence of Fe and Ni metals.
A nanostructured Ni-ferrite material, NiFe2O4, was successfully synthesized via facile co-precipitation in hot water, followed by an annealing process. The developed Ni-ferrite was face-centered cubic, highly crystalline, and nano-sized. The Ni-ferrite anode revealed superior electrochemical properties for Li-ion batteries, such as high reversible capacity and long cyclability, without significant capacity fading. Specifically, this anode exhibited reversible capacities of 926 and 1586 mAh g-1 at the 1st and 150th cycles at 0.1 A g-1, respectively. The superior electrochemical performance was attributed to the size and unique properties of the Ni-ferrite spinel. Nano-sized materials were beneficial for creating a large contact area between the electrode and electrolyte, increasing diffusion rates of lithium ions, resulting in enhanced pseudo-behavior. The properties of spinel structure and the presence of Fe and Ni metals during charge/discharge in Ni-ferrite prevented the destruction of the anode and catalyzed the decomposition of the Li2O phase, leading to extraordinary highly-reversible Li storage.
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