Rational Synthesis and Assembly of Ni3S4 Nanorods for Enhanced Electrochemical Sodium-Ion Storage.
ACS Nano
; 12(2): 1829-1836, 2018 02 27.
Article
em En
| MEDLINE
| ID: mdl-29397688
ABSTRACT
Even though advocated as the potential low-cost alternatives to current lithium-ion technology, the practical viability of sodium-ion batteries remains illusive and depends on the development of high-performance electrode materials. Very few candidates available at present can simultaneously meet the requirements on capacity, rate capability, and cycle life. Herein, we report a high-temperature solution method to prepare Ni3S4 nanorods with uniform sizes. These colloidal nanorods readily self-assemble side by side and form microsized superstructures, which unfortunately negates the nanoscale feature of individual nanorods. To this end, we further introduce two-dimensional graphene nanosheets as the spacer to interrupt nanorod self-assembly. Resultant composite presents a marked advantage toward electrochemical storage of Na+ ions. We demonstrate that in half-cells it exhibits large reversible specific capacity in excess of 600 mAh/g, high rate capability with >300 mAh/g retained at 4 A/g, and great cycle life at different current rates. This anode material can also be combined with the NASICON-type Na3V2(PO4)3 cathode in full cells to enable large capacity and good cyclability.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
ACS Nano
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
China