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. 2023 Jun 23;13(1):10228.
doi: 10.1038/s41598-023-37315-6.

Facile synthesis of spongy NiCo2O4 powders for lithium-ion storage

H Mahboubi  1 , S M Masoudpanah  2 , S Alamolhoda  1 , M Hasheminiasari  1
Affiliations

Facile synthesis of spongy NiCo2O4 powders for lithium-ion storage

H Mahboubi et al. Sci Rep. .

Abstract

Spongy NiCo2O4 powders were prepared by solution combustion synthesis (SCS) method for lithium ions storage. The effects of combustion parameters including fuel type (L-lysine, glycine, and urea) and fuel amount on the lithium storage performance of NiCo2O4 powders were analyzed by various characterization techniques. Single-phase NiCo2O4 powders with extremely porous microstructure showed a strong drop of initial specific capacity up to 350 mAhg-1 which was recovered up to 666 mAhg-1 following 100 charge/discharge cycles. However, the NiCo2O4 powders prepared by the urea and L-lysine fuels with the compacted microstructure showed the capacity loss without any recovery. The spongy NiCo2O4 powders showed an acceptable capability rate performance (404 mAhg-1 @ 400 mAg-1).

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
(a) XRD patterns, (b) lattice strain and crystallite size of the as-calcined powders as a function of fuel type.
Figure 2
Figure 2
SEM of the as-calcined (a, d) L1, (b, e) U1, (c, f) G1 powders.
Figure 3
Figure 3
2D distribution of Ni, Co, and O elements and EDS spectrum in the as-calcined G0.5 powders.
Figure 4
Figure 4
N2 adsorption–desorption isotherms and pore size plot of (a) U1 and (b) G1 powders.
Figure 5
Figure 5
Cycling performance and columbic efficiency of the L1, U1, and G1 powders.
Figure 6
Figure 6
(a) XRD patterns and SEM images of (b, e) G0.5, (c, f) G1, and (d, g) G2 powders and (h) cycling performance and (i) capability rate.
Figure 7
Figure 7
(a) cycling performance of and coulombic coefficient, (b–e) CV curves and (f) charge/discharge profiles of the G1 electrode at various cycles.
Figure 8
Figure 8
(a) Nyquist plots and the fitted values of the G1 electrode after different cycles, and (b) The values of Rs, Rsf, and Rct vs. cycle number.
Figure 9
Figure 9
SEM images of the G1 electrode before cycling (a, e) and after 4th (b, f), 25th (c, g), and 100th cycle (d, h).
See this image and copyright information in PMC

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